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From nightowl...@apache.org
Subject [50/72] [abbrv] [partial] lucenenet git commit: Lucene.Net.Tests: Removed \core directory and put its contents in root directory
Date Sun, 26 Feb 2017 23:37:38 GMT
http://git-wip-us.apache.org/repos/asf/lucenenet/blob/96822396/src/Lucene.Net.Tests/Analysis/TestGraphTokenizers.cs
----------------------------------------------------------------------
diff --git a/src/Lucene.Net.Tests/Analysis/TestGraphTokenizers.cs b/src/Lucene.Net.Tests/Analysis/TestGraphTokenizers.cs
new file mode 100644
index 0000000..73619d1
--- /dev/null
+++ b/src/Lucene.Net.Tests/Analysis/TestGraphTokenizers.cs
@@ -0,0 +1,728 @@
+using Lucene.Net.Analysis.TokenAttributes;
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Text;
+
+namespace Lucene.Net.Analysis
+{
+    using Lucene.Net.Support;
+    using NUnit.Framework;
+    using System.IO;
+
+    /*
+         * Licensed to the Apache Software Foundation (ASF) under one or more
+         * contributor license agreements.  See the NOTICE file distributed with
+         * this work for additional information regarding copyright ownership.
+         * The ASF licenses this file to You under the Apache License, Version 2.0
+         * (the "License"); you may not use this file except in compliance with
+         * the License.  You may obtain a copy of the License at
+         *
+         *     http://www.apache.org/licenses/LICENSE-2.0
+         *
+         * Unless required by applicable law or agreed to in writing, software
+         * distributed under the License is distributed on an "AS IS" BASIS,
+         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+         * See the License for the specific language governing permissions and
+         * limitations under the License.
+         */
+
+    using Automaton = Lucene.Net.Util.Automaton.Automaton;
+    using BasicAutomata = Lucene.Net.Util.Automaton.BasicAutomata;
+    using BasicOperations = Lucene.Net.Util.Automaton.BasicOperations;
+
+    [TestFixture]
+    public class TestGraphTokenizers : BaseTokenStreamTestCase
+    {
+        // Makes a graph TokenStream from the string; separate
+        // positions with single space, multiple tokens at the same
+        // position with /, and add optional position length with
+        // :.  EG "a b c" is a simple chain, "a/x b c" adds 'x'
+        // over 'a' at position 0 with posLen=1, "a/x:3 b c" adds
+        // 'x' over a with posLen=3.  Tokens are in normal-form!
+        // So, offsets are computed based on the first token at a
+        // given position.  NOTE: each token must be a single
+        // character!  We assume this when computing offsets...
+
+        // NOTE: all input tokens must be length 1!!!  this means
+        // you cannot turn on MockCharFilter when random
+        // testing...
+
+        private class GraphTokenizer : Tokenizer
+        {
+            internal IList<Token> Tokens;
+            internal int Upto;
+            internal int InputLength;
+
+            internal readonly ICharTermAttribute TermAtt;
+            internal readonly IOffsetAttribute OffsetAtt;
+            internal readonly IPositionIncrementAttribute PosIncrAtt;
+            internal readonly IPositionLengthAttribute PosLengthAtt;
+
+            public GraphTokenizer(TextReader input)
+                : base(input)
+            {
+                TermAtt = AddAttribute<ICharTermAttribute>();
+                OffsetAtt = AddAttribute<IOffsetAttribute>();
+                PosIncrAtt = AddAttribute<IPositionIncrementAttribute>();
+                PosLengthAtt = AddAttribute<IPositionLengthAttribute>();
+            }
+
+            public override void Reset()
+            {
+                base.Reset();
+                Tokens = null;
+                Upto = 0;
+            }
+
+            public sealed override bool IncrementToken()
+            {
+                if (Tokens == null)
+                {
+                    FillTokens();
+                }
+                //System.out.println("graphTokenizer: incr upto=" + upto + " vs " + tokens.size());
+                if (Upto == Tokens.Count)
+                {
+                    //System.out.println("  END @ " + tokens.size());
+                    return false;
+                }
+                Token t = Tokens[Upto++];
+                //System.out.println("  return token=" + t);
+                ClearAttributes();
+                TermAtt.Append(t.ToString());
+                OffsetAtt.SetOffset(t.StartOffset, t.EndOffset);
+                PosIncrAtt.PositionIncrement = t.PositionIncrement;
+                PosLengthAtt.PositionLength = t.PositionLength;
+                return true;
+            }
+
+            public override void End()
+            {
+                base.End();
+                // NOTE: somewhat... hackish, but we need this to
+                // satisfy BTSTC:
+                int lastOffset;
+                if (Tokens != null && Tokens.Count > 0)
+                {
+                    lastOffset = Tokens[Tokens.Count - 1].EndOffset;
+                }
+                else
+                {
+                    lastOffset = 0;
+                }
+                OffsetAtt.SetOffset(CorrectOffset(lastOffset), CorrectOffset(InputLength));
+            }
+
+            internal virtual void FillTokens()
+            {
+                StringBuilder sb = new StringBuilder();
+                char[] buffer = new char[256];
+                while (true)
+                {
+                    int count = m_input.Read(buffer, 0, buffer.Length);
+
+                    //.NET TextReader.Read(buff, int, int) returns 0, not -1 on no chars
+                    // but in some cases, such as MockCharFilter, it overloads read and returns -1
+                    // so we should handle both 0 and -1 values
+                    if (count <= 0)
+                    {
+                        break;
+                    }
+                    sb.Append(buffer, 0, count);
+                    //System.out.println("got count=" + count);
+                }
+                //System.out.println("fillTokens: " + sb);
+
+                InputLength = sb.Length;
+
+                string[] parts = sb.ToString().Split(' ');
+
+                Tokens = new List<Token>();
+                int pos = 0;
+                int maxPos = -1;
+                int offset = 0;
+                //System.out.println("again");
+                foreach (string part in parts)
+                {
+                    string[] overlapped = part.Split('/');
+                    bool firstAtPos = true;
+                    int minPosLength = int.MaxValue;
+                    foreach (string part2 in overlapped)
+                    {
+                        int colonIndex = part2.IndexOf(':');
+                        string token;
+                        int posLength;
+                        if (colonIndex != -1)
+                        {
+                            token = part2.Substring(0, colonIndex);
+                            posLength = Convert.ToInt32(part2.Substring(1 + colonIndex));
+                        }
+                        else
+                        {
+                            token = part2;
+                            posLength = 1;
+                        }
+                        maxPos = Math.Max(maxPos, pos + posLength);
+                        minPosLength = Math.Min(minPosLength, posLength);
+                        Token t = new Token(token, offset, offset + 2 * posLength - 1);
+                        t.PositionLength = posLength;
+                        t.PositionIncrement = firstAtPos ? 1 : 0;
+                        firstAtPos = false;
+                        //System.out.println("  add token=" + t + " startOff=" + t.StartOffset + " endOff=" + t.EndOffset);
+                        Tokens.Add(t);
+                    }
+                    pos += minPosLength;
+                    offset = 2 * pos;
+                }
+                Debug.Assert(maxPos <= pos, "input string mal-formed: posLength>1 tokens hang over the end");
+            }
+        }
+
+        [Test]
+        public virtual void TestMockGraphTokenFilterBasic()
+        {
+            for (int iter = 0; iter < 10 * RANDOM_MULTIPLIER; iter++)
+            {
+                if (VERBOSE)
+                {
+                    Console.WriteLine("\nTEST: iter=" + iter);
+                }
+
+                // Make new analyzer each time, because MGTF has fixed
+                // seed:
+                Analyzer a = new AnalyzerAnonymousInnerClassHelper(this);
+
+                CheckAnalysisConsistency(Random(), a, false, "a b c d e f g h i j k");
+            }
+        }
+
+        private class AnalyzerAnonymousInnerClassHelper : Analyzer
+        {
+            private readonly TestGraphTokenizers OuterInstance;
+
+            public AnalyzerAnonymousInnerClassHelper(TestGraphTokenizers outerInstance)
+            {
+                this.OuterInstance = outerInstance;
+            }
+
+            protected internal override TokenStreamComponents CreateComponents(string fieldName, TextReader reader)
+            {
+                Tokenizer t = new MockTokenizer(reader, MockTokenizer.WHITESPACE, false);
+                TokenStream t2 = new MockGraphTokenFilter(Random(), t);
+                return new TokenStreamComponents(t, t2);
+            }
+        }
+
+        [Test]
+        public virtual void TestMockGraphTokenFilterOnGraphInput()
+        {
+            for (int iter = 0; iter < 100 * RANDOM_MULTIPLIER; iter++)
+            {
+                if (VERBOSE)
+                {
+                    Console.WriteLine("\nTEST: iter=" + iter);
+                }
+
+                // Make new analyzer each time, because MGTF has fixed
+                // seed:
+                Analyzer a = new AnalyzerAnonymousInnerClassHelper2(this);
+
+                CheckAnalysisConsistency(Random(), a, false, "a/x:3 c/y:2 d e f/z:4 g h i j k");
+            }
+        }
+
+        private class AnalyzerAnonymousInnerClassHelper2 : Analyzer
+        {
+            private readonly TestGraphTokenizers OuterInstance;
+
+            public AnalyzerAnonymousInnerClassHelper2(TestGraphTokenizers outerInstance)
+            {
+                this.OuterInstance = outerInstance;
+            }
+
+            protected internal override TokenStreamComponents CreateComponents(string fieldName, TextReader reader)
+            {
+                Tokenizer t = new GraphTokenizer(reader);
+                TokenStream t2 = new MockGraphTokenFilter(Random(), t);
+                return new TokenStreamComponents(t, t2);
+            }
+        }
+
+        // Just deletes (leaving hole) token 'a':
+        private sealed class RemoveATokens : TokenFilter
+        {
+            internal int PendingPosInc;
+
+            internal readonly ICharTermAttribute TermAtt;// = addAttribute(typeof(CharTermAttribute));
+            internal readonly IPositionIncrementAttribute PosIncAtt;// = addAttribute(typeof(PositionIncrementAttribute));
+
+            public RemoveATokens(TokenStream @in)
+                : base(@in)
+            {
+                TermAtt = AddAttribute<ICharTermAttribute>();
+                PosIncAtt = AddAttribute<IPositionIncrementAttribute>();
+            }
+
+            public override void Reset()
+            {
+                base.Reset();
+                PendingPosInc = 0;
+            }
+
+            public override void End()
+            {
+                base.End();
+                PosIncAtt.PositionIncrement = PendingPosInc + PosIncAtt.PositionIncrement;
+            }
+
+            public override bool IncrementToken()
+            {
+                while (true)
+                {
+                    bool gotOne = m_input.IncrementToken();
+                    if (!gotOne)
+                    {
+                        return false;
+                    }
+                    else if (TermAtt.ToString().Equals("a"))
+                    {
+                        PendingPosInc += PosIncAtt.PositionIncrement;
+                    }
+                    else
+                    {
+                        PosIncAtt.PositionIncrement = PendingPosInc + PosIncAtt.PositionIncrement;
+                        PendingPosInc = 0;
+                        return true;
+                    }
+                }
+            }
+        }
+
+        [Test]
+        public virtual void TestMockGraphTokenFilterBeforeHoles()
+        {
+            for (int iter = 0; iter < 100 * RANDOM_MULTIPLIER; iter++)
+            {
+                if (VERBOSE)
+                {
+                    Console.WriteLine("\nTEST: iter=" + iter);
+                }
+
+                // Make new analyzer each time, because MGTF has fixed
+                // seed:
+                Analyzer a = new MGTFBHAnalyzerAnonymousInnerClassHelper(this);
+
+                Random random = Random();
+                CheckAnalysisConsistency(random, a, false, "a b c d e f g h i j k");
+                CheckAnalysisConsistency(random, a, false, "x y a b c d e f g h i j k");
+                CheckAnalysisConsistency(random, a, false, "a b c d e f g h i j k a");
+                CheckAnalysisConsistency(random, a, false, "a b c d e f g h i j k a x y");
+            }
+        }
+
+        private class MGTFBHAnalyzerAnonymousInnerClassHelper : Analyzer
+        {
+            private readonly TestGraphTokenizers OuterInstance;
+
+            public MGTFBHAnalyzerAnonymousInnerClassHelper(TestGraphTokenizers outerInstance)
+            {
+                this.OuterInstance = outerInstance;
+            }
+
+            protected internal override TokenStreamComponents CreateComponents(string fieldName, TextReader reader)
+            {
+                Tokenizer t = new MockTokenizer(reader, MockTokenizer.WHITESPACE, false);
+                TokenStream t2 = new MockGraphTokenFilter(Random(), t);
+                TokenStream t3 = new RemoveATokens(t2);
+                return new TokenStreamComponents(t, t3);
+            }
+        }
+
+        [Test]
+        public virtual void TestMockGraphTokenFilterAfterHoles()
+        {
+            for (int iter = 0; iter < 100 * RANDOM_MULTIPLIER; iter++)
+            {
+                if (VERBOSE)
+                {
+                    Console.WriteLine("\nTEST: iter=" + iter);
+                }
+
+                // Make new analyzer each time, because MGTF has fixed
+                // seed:
+                Analyzer a = new MGTFAHAnalyzerAnonymousInnerClassHelper2(this);
+
+                Random random = Random();
+                CheckAnalysisConsistency(random, a, false, "a b c d e f g h i j k");
+                CheckAnalysisConsistency(random, a, false, "x y a b c d e f g h i j k");
+                CheckAnalysisConsistency(random, a, false, "a b c d e f g h i j k a");
+                CheckAnalysisConsistency(random, a, false, "a b c d e f g h i j k a x y");
+            }
+        }
+
+        private class MGTFAHAnalyzerAnonymousInnerClassHelper2 : Analyzer
+        {
+            private readonly TestGraphTokenizers OuterInstance;
+
+            public MGTFAHAnalyzerAnonymousInnerClassHelper2(TestGraphTokenizers outerInstance)
+            {
+                this.OuterInstance = outerInstance;
+            }
+
+            protected internal override TokenStreamComponents CreateComponents(string fieldName, TextReader reader)
+            {
+                Tokenizer t = new MockTokenizer(reader, MockTokenizer.WHITESPACE, false);
+                TokenStream t2 = new RemoveATokens(t);
+                TokenStream t3 = new MockGraphTokenFilter(Random(), t2);
+                return new TokenStreamComponents(t, t3);
+            }
+        }
+
+        [Test]
+        public virtual void TestMockGraphTokenFilterRandom()
+        {
+            for (int iter = 0; iter < 10 * RANDOM_MULTIPLIER; iter++)
+            {
+                if (VERBOSE)
+                {
+                    Console.WriteLine("\nTEST: iter=" + iter);
+                }
+
+                // Make new analyzer each time, because MGTF has fixed
+                // seed:
+                Analyzer a = new AnalyzerAnonymousInnerClassHelper3(this);
+
+                Random random = Random();
+                CheckRandomData(random, a, 5, AtLeast(100));
+            }
+        }
+
+        private class AnalyzerAnonymousInnerClassHelper3 : Analyzer
+        {
+            private readonly TestGraphTokenizers OuterInstance;
+
+            public AnalyzerAnonymousInnerClassHelper3(TestGraphTokenizers outerInstance)
+            {
+                this.OuterInstance = outerInstance;
+            }
+
+            protected internal override TokenStreamComponents CreateComponents(string fieldName, TextReader reader)
+            {
+                Tokenizer t = new MockTokenizer(reader, MockTokenizer.WHITESPACE, false);
+                TokenStream t2 = new MockGraphTokenFilter(Random(), t);
+                return new TokenStreamComponents(t, t2);
+            }
+        }
+
+        // Two MockGraphTokenFilters
+        [Test]
+        public virtual void TestDoubleMockGraphTokenFilterRandom()
+        {
+            for (int iter = 0; iter < 10 * RANDOM_MULTIPLIER; iter++)
+            {
+                if (VERBOSE)
+                {
+                    Console.WriteLine("\nTEST: iter=" + iter);
+                }
+
+                // Make new analyzer each time, because MGTF has fixed
+                // seed:
+                Analyzer a = new AnalyzerAnonymousInnerClassHelper4(this);
+
+                Random random = Random();
+                CheckRandomData(random, a, 5, AtLeast(100));
+            }
+        }
+
+        [Test]
+        public void TestMockTokenizerCtor()
+        {
+            var sr = new StringReader("Hello");
+            var mt = new MockTokenizer(sr);
+        }
+
+        private class AnalyzerAnonymousInnerClassHelper4 : Analyzer
+        {
+            private readonly TestGraphTokenizers OuterInstance;
+
+            public AnalyzerAnonymousInnerClassHelper4(TestGraphTokenizers outerInstance)
+            {
+                this.OuterInstance = outerInstance;
+            }
+
+            protected internal override TokenStreamComponents CreateComponents(string fieldName, TextReader reader)
+            {
+                Tokenizer t = new MockTokenizer(reader, MockTokenizer.WHITESPACE, false);
+                TokenStream t1 = new MockGraphTokenFilter(Random(), t);
+                TokenStream t2 = new MockGraphTokenFilter(Random(), t1);
+                return new TokenStreamComponents(t, t2);
+            }
+        }
+
+        [Test]
+        public virtual void TestMockGraphTokenFilterBeforeHolesRandom()
+        {
+            for (int iter = 0; iter < 10 * RANDOM_MULTIPLIER; iter++)
+            {
+                if (VERBOSE)
+                {
+                    Console.WriteLine("\nTEST: iter=" + iter);
+                }
+
+                // Make new analyzer each time, because MGTF has fixed
+                // seed:
+                Analyzer a = new AnalyzerAnonymousInnerClassHelper5(this);
+
+                Random random = Random();
+                CheckRandomData(random, a, 5, AtLeast(100));
+            }
+        }
+
+        private class AnalyzerAnonymousInnerClassHelper5 : Analyzer
+        {
+            private readonly TestGraphTokenizers OuterInstance;
+
+            public AnalyzerAnonymousInnerClassHelper5(TestGraphTokenizers outerInstance)
+            {
+                this.OuterInstance = outerInstance;
+            }
+
+            protected internal override TokenStreamComponents CreateComponents(string fieldName, TextReader reader)
+            {
+                Tokenizer t = new MockTokenizer(reader, MockTokenizer.WHITESPACE, false);
+                TokenStream t1 = new MockGraphTokenFilter(Random(), t);
+                TokenStream t2 = new MockHoleInjectingTokenFilter(Random(), t1);
+                return new TokenStreamComponents(t, t2);
+            }
+        }
+
+        [Test]
+        public virtual void TestMockGraphTokenFilterAfterHolesRandom()
+        {
+            for (int iter = 0; iter < 10 * RANDOM_MULTIPLIER; iter++)
+            {
+                if (VERBOSE)
+                {
+                    Console.WriteLine("\nTEST: iter=" + iter);
+                }
+
+                // Make new analyzer each time, because MGTF has fixed
+                // seed:
+                Analyzer a = new AnalyzerAnonymousInnerClassHelper6(this);
+
+                Random random = Random();
+                CheckRandomData(random, a, 5, AtLeast(100));
+            }
+        }
+
+        private class AnalyzerAnonymousInnerClassHelper6 : Analyzer
+        {
+            private readonly TestGraphTokenizers OuterInstance;
+
+            public AnalyzerAnonymousInnerClassHelper6(TestGraphTokenizers outerInstance)
+            {
+                this.OuterInstance = outerInstance;
+            }
+
+            protected internal override TokenStreamComponents CreateComponents(string fieldName, TextReader reader)
+            {
+                Tokenizer t = new MockTokenizer(reader, MockTokenizer.WHITESPACE, false);
+                TokenStream t1 = new MockHoleInjectingTokenFilter(Random(), t);
+                TokenStream t2 = new MockGraphTokenFilter(Random(), t1);
+                return new TokenStreamComponents(t, t2);
+            }
+        }
+
+        private static Token Token(string term, int posInc, int posLength)
+        {
+            Token t = new Token(term, 0, 0);
+            t.PositionIncrement = posInc;
+            t.PositionLength = posLength;
+            return t;
+        }
+
+        private static Token Token(string term, int posInc, int posLength, int startOffset, int endOffset)
+        {
+            Token t = new Token(term, startOffset, endOffset);
+            t.PositionIncrement = posInc;
+            t.PositionLength = posLength;
+            return t;
+        }
+
+        [Test]
+        public virtual void TestSingleToken()
+        {
+            TokenStream ts = new CannedTokenStream(new Token[] { Token("abc", 1, 1) });
+            Automaton actual = (new TokenStreamToAutomaton()).ToAutomaton(ts);
+            Automaton expected = BasicAutomata.MakeString("abc");
+            Assert.IsTrue(BasicOperations.SameLanguage(expected, actual));
+        }
+
+        [Test]
+        public virtual void TestMultipleHoles()
+        {
+            TokenStream ts = new CannedTokenStream(new Token[] { Token("a", 1, 1), Token("b", 3, 1) });
+            Automaton actual = (new TokenStreamToAutomaton()).ToAutomaton(ts);
+            Automaton expected = Join(S2a("a"), SEP_A, HOLE_A, SEP_A, HOLE_A, SEP_A, S2a("b"));
+            Assert.IsTrue(BasicOperations.SameLanguage(expected, actual));
+        }
+
+        [Test]
+        public virtual void TestSynOverMultipleHoles()
+        {
+            TokenStream ts = new CannedTokenStream(new Token[] { Token("a", 1, 1), Token("x", 0, 3), Token("b", 3, 1) });
+            Automaton actual = (new TokenStreamToAutomaton()).ToAutomaton(ts);
+            Automaton a1 = Join(S2a("a"), SEP_A, HOLE_A, SEP_A, HOLE_A, SEP_A, S2a("b"));
+            Automaton a2 = Join(S2a("x"), SEP_A, S2a("b"));
+            Automaton expected = BasicOperations.Union(a1, a2);
+            Assert.IsTrue(BasicOperations.SameLanguage(expected, actual));
+        }
+
+        // for debugging!
+        /*
+        private static void toDot(Automaton a) throws IOException {
+          final String s = a.toDot();
+          Writer w = new OutputStreamWriter(new FileOutputStream("/x/tmp/out.dot"));
+          w.write(s);
+          w.close();
+          System.out.println("TEST: saved to /x/tmp/out.dot");
+        }
+        */
+
+        private static readonly Automaton SEP_A = BasicAutomata.MakeChar(TokenStreamToAutomaton.POS_SEP);
+        private static readonly Automaton HOLE_A = BasicAutomata.MakeChar(TokenStreamToAutomaton.HOLE);
+
+        private Automaton Join(params string[] strings)
+        {
+            IList<Automaton> @as = new List<Automaton>();
+            foreach (string s in strings)
+            {
+                @as.Add(BasicAutomata.MakeString(s));
+                @as.Add(SEP_A);
+            }
+            @as.RemoveAt(@as.Count - 1);
+            return BasicOperations.Concatenate(@as);
+        }
+
+        private Automaton Join(params Automaton[] @as)
+        {
+            return BasicOperations.Concatenate(Arrays.AsList(@as));
+        }
+
+        private Automaton S2a(string s)
+        {
+            return BasicAutomata.MakeString(s);
+        }
+
+        [Test]
+        public virtual void TestTwoTokens()
+        {
+            TokenStream ts = new CannedTokenStream(new Token[] { Token("abc", 1, 1), Token("def", 1, 1) });
+            Automaton actual = (new TokenStreamToAutomaton()).ToAutomaton(ts);
+            Automaton expected = Join("abc", "def");
+
+            //toDot(actual);
+            Assert.IsTrue(BasicOperations.SameLanguage(expected, actual));
+        }
+
+        [Test]
+        public virtual void TestHole()
+        {
+            TokenStream ts = new CannedTokenStream(new Token[] { Token("abc", 1, 1), Token("def", 2, 1) });
+            Automaton actual = (new TokenStreamToAutomaton()).ToAutomaton(ts);
+
+            Automaton expected = Join(S2a("abc"), SEP_A, HOLE_A, SEP_A, S2a("def"));
+
+            //toDot(actual);
+            Assert.IsTrue(BasicOperations.SameLanguage(expected, actual));
+        }
+
+        [Test]
+        public virtual void TestOverlappedTokensSausage()
+        {
+            // Two tokens on top of each other (sausage):
+            TokenStream ts = new CannedTokenStream(new Token[] { Token("abc", 1, 1), Token("xyz", 0, 1) });
+            Automaton actual = (new TokenStreamToAutomaton()).ToAutomaton(ts);
+            Automaton a1 = BasicAutomata.MakeString("abc");
+            Automaton a2 = BasicAutomata.MakeString("xyz");
+            Automaton expected = BasicOperations.Union(a1, a2);
+            Assert.IsTrue(BasicOperations.SameLanguage(expected, actual));
+        }
+
+        [Test]
+        public virtual void TestOverlappedTokensLattice()
+        {
+            TokenStream ts = new CannedTokenStream(new Token[] { Token("abc", 1, 1), Token("xyz", 0, 2), Token("def", 1, 1) });
+            Automaton actual = (new TokenStreamToAutomaton()).ToAutomaton(ts);
+            Automaton a1 = BasicAutomata.MakeString("xyz");
+            Automaton a2 = Join("abc", "def");
+
+            Automaton expected = BasicOperations.Union(a1, a2);
+            //toDot(actual);
+            Assert.IsTrue(BasicOperations.SameLanguage(expected, actual));
+        }
+
+        [Test]
+        public virtual void TestSynOverHole()
+        {
+            TokenStream ts = new CannedTokenStream(new Token[] { Token("a", 1, 1), Token("X", 0, 2), Token("b", 2, 1) });
+            Automaton actual = (new TokenStreamToAutomaton()).ToAutomaton(ts);
+            Automaton a1 = BasicOperations.Union(Join(S2a("a"), SEP_A, HOLE_A), BasicAutomata.MakeString("X"));
+            Automaton expected = BasicOperations.Concatenate(a1, Join(SEP_A, S2a("b")));
+            //toDot(actual);
+            Assert.IsTrue(BasicOperations.SameLanguage(expected, actual));
+        }
+
+        [Test]
+        public virtual void TestSynOverHole2()
+        {
+            TokenStream ts = new CannedTokenStream(new Token[] { Token("xyz", 1, 1), Token("abc", 0, 3), Token("def", 2, 1) });
+            Automaton actual = (new TokenStreamToAutomaton()).ToAutomaton(ts);
+            Automaton expected = BasicOperations.Union(Join(S2a("xyz"), SEP_A, HOLE_A, SEP_A, S2a("def")), BasicAutomata.MakeString("abc"));
+            Assert.IsTrue(BasicOperations.SameLanguage(expected, actual));
+        }
+
+        [Test]
+        public virtual void TestOverlappedTokensLattice2()
+        {
+            TokenStream ts = new CannedTokenStream(new Token[] { Token("abc", 1, 1), Token("xyz", 0, 3), Token("def", 1, 1), Token("ghi", 1, 1) });
+            Automaton actual = (new TokenStreamToAutomaton()).ToAutomaton(ts);
+            Automaton a1 = BasicAutomata.MakeString("xyz");
+            Automaton a2 = Join("abc", "def", "ghi");
+            Automaton expected = BasicOperations.Union(a1, a2);
+            //toDot(actual);
+            Assert.IsTrue(BasicOperations.SameLanguage(expected, actual));
+        }
+
+        [Test]
+        public virtual void TestToDot()
+        {
+            TokenStream ts = new CannedTokenStream(new Token[] { Token("abc", 1, 1, 0, 4) });
+            StringWriter w = new StringWriter();
+            (new TokenStreamToDot("abcd", ts, (TextWriter)(w))).ToDot();
+            Assert.IsTrue(w.ToString().IndexOf("abc / abcd") != -1);
+        }
+
+        [Test]
+        public virtual void TestStartsWithHole()
+        {
+            TokenStream ts = new CannedTokenStream(new Token[] { Token("abc", 2, 1) });
+            Automaton actual = (new TokenStreamToAutomaton()).ToAutomaton(ts);
+            Automaton expected = Join(HOLE_A, SEP_A, S2a("abc"));
+            //toDot(actual);
+            Assert.IsTrue(BasicOperations.SameLanguage(expected, actual));
+        }
+
+        // TODO: testEndsWithHole... but we need posInc to set in TS.end()
+
+        [Test]
+        public virtual void TestSynHangingOverEnd()
+        {
+            TokenStream ts = new CannedTokenStream(new Token[] { Token("a", 1, 1), Token("X", 0, 10) });
+            Automaton actual = (new TokenStreamToAutomaton()).ToAutomaton(ts);
+            Automaton expected = BasicOperations.Union(BasicAutomata.MakeString("a"), BasicAutomata.MakeString("X"));
+            Assert.IsTrue(BasicOperations.SameLanguage(expected, actual));
+        }
+    }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/lucenenet/blob/96822396/src/Lucene.Net.Tests/Analysis/TestLookaheadTokenFilter.cs
----------------------------------------------------------------------
diff --git a/src/Lucene.Net.Tests/Analysis/TestLookaheadTokenFilter.cs b/src/Lucene.Net.Tests/Analysis/TestLookaheadTokenFilter.cs
new file mode 100644
index 0000000..ee733bd
--- /dev/null
+++ b/src/Lucene.Net.Tests/Analysis/TestLookaheadTokenFilter.cs
@@ -0,0 +1,129 @@
+using Lucene.Net.Attributes;
+using Lucene.Net.Randomized.Generators;
+using NUnit.Framework;
+using System;
+using System.IO;
+
+namespace Lucene.Net.Analysis
+{
+    /*
+     * Licensed to the Apache Software Foundation (ASF) under one or more
+     * contributor license agreements.  See the NOTICE file distributed with
+     * this work for additional information regarding copyright ownership.
+     * The ASF licenses this file to You under the Apache License, Version 2.0
+     * (the "License"); you may not use this file except in compliance with
+     * the License.  You may obtain a copy of the License at
+     *
+     *     http://www.apache.org/licenses/LICENSE-2.0
+     *
+     * Unless required by applicable law or agreed to in writing, software
+     * distributed under the License is distributed on an "AS IS" BASIS,
+     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     * See the License for the specific language governing permissions and
+     * limitations under the License.
+     */
+
+    [TestFixture]
+    public class TestLookaheadTokenFilter : BaseTokenStreamTestCase
+    {
+#if !NETSTANDARD
+        // LUCENENET: There is no Timeout on NUnit for .NET Core.
+        [Timeout(int.MaxValue)]
+#endif
+        [Test, LongRunningTest, HasTimeout]
+        public virtual void TestRandomStrings()
+        {
+            Analyzer a = new AnalyzerAnonymousInnerClassHelper(this);
+            CheckRandomData(Random(), a, 200 * RANDOM_MULTIPLIER, 8192);
+        }
+
+        private class AnalyzerAnonymousInnerClassHelper : Analyzer
+        {
+            private readonly TestLookaheadTokenFilter OuterInstance;
+
+            public AnalyzerAnonymousInnerClassHelper(TestLookaheadTokenFilter outerInstance)
+            {
+                this.OuterInstance = outerInstance;
+            }
+
+            protected internal override TokenStreamComponents CreateComponents(string fieldName, TextReader reader)
+            {
+                Random random = Random();
+                Tokenizer tokenizer = new MockTokenizer(reader, MockTokenizer.WHITESPACE, random.NextBoolean());
+                TokenStream output = new MockRandomLookaheadTokenFilter(random, tokenizer);
+                return new TokenStreamComponents(tokenizer, output);
+            }
+        }
+
+        private class NeverPeeksLookaheadTokenFilter : LookaheadTokenFilter<LookaheadTokenFilter.Position>
+        {
+            public NeverPeeksLookaheadTokenFilter(TokenStream input)
+                : base(input)
+            {
+            }
+
+            protected internal override LookaheadTokenFilter.Position NewPosition()
+            {
+                return new LookaheadTokenFilter.Position();
+            }
+
+            public sealed override bool IncrementToken()
+            {
+                return NextToken();
+            }
+        }
+
+#if !NETSTANDARD
+        // LUCENENET: There is no Timeout on NUnit for .NET Core.
+        [Timeout(int.MaxValue)]
+#endif
+        [Test, LongRunningTest, HasTimeout]
+        public virtual void TestNeverCallingPeek()
+        {
+            Analyzer a = new NCPAnalyzerAnonymousInnerClassHelper(this);
+            CheckRandomData(Random(), a, 200 * RANDOM_MULTIPLIER, 8192);
+        }
+
+        private class NCPAnalyzerAnonymousInnerClassHelper : Analyzer
+        {
+            private readonly TestLookaheadTokenFilter OuterInstance;
+
+            public NCPAnalyzerAnonymousInnerClassHelper(TestLookaheadTokenFilter outerInstance)
+            {
+                this.OuterInstance = outerInstance;
+            }
+
+            protected internal override TokenStreamComponents CreateComponents(string fieldName, TextReader reader)
+            {
+                Tokenizer tokenizer = new MockTokenizer(reader, MockTokenizer.WHITESPACE, Random().NextBoolean());
+                TokenStream output = new NeverPeeksLookaheadTokenFilter(tokenizer);
+                return new TokenStreamComponents(tokenizer, output);
+            }
+        }
+
+        [Test]
+        public virtual void TestMissedFirstToken()
+        {
+            Analyzer analyzer = new AnalyzerAnonymousInnerClassHelper2(this);
+
+            AssertAnalyzesTo(analyzer, "Only he who is running knows .", new string[] { "Only", "Only-huh?", "he", "he-huh?", "who", "who-huh?", "is", "is-huh?", "running", "running-huh?", "knows", "knows-huh?", ".", ".-huh?" });
+        }
+
+        private class AnalyzerAnonymousInnerClassHelper2 : Analyzer
+        {
+            private readonly TestLookaheadTokenFilter OuterInstance;
+
+            public AnalyzerAnonymousInnerClassHelper2(TestLookaheadTokenFilter outerInstance)
+            {
+                this.OuterInstance = outerInstance;
+            }
+
+            protected internal override TokenStreamComponents CreateComponents(string fieldName, TextReader reader)
+            {
+                Tokenizer source = new MockTokenizer(reader, MockTokenizer.WHITESPACE, false);
+                TrivialLookaheadFilter filter = new TrivialLookaheadFilter(source);
+                return new TokenStreamComponents(source, filter);
+            }
+        }
+    }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/lucenenet/blob/96822396/src/Lucene.Net.Tests/Analysis/TestMockAnalyzer.cs
----------------------------------------------------------------------
diff --git a/src/Lucene.Net.Tests/Analysis/TestMockAnalyzer.cs b/src/Lucene.Net.Tests/Analysis/TestMockAnalyzer.cs
new file mode 100644
index 0000000..cd8f315
--- /dev/null
+++ b/src/Lucene.Net.Tests/Analysis/TestMockAnalyzer.cs
@@ -0,0 +1,420 @@
+using System;
+using Lucene.Net.Attributes;
+using Lucene.Net.Documents;
+using Lucene.Net.Index;
+
+namespace Lucene.Net.Analysis
+{
+    using Lucene.Net.Randomized.Generators;
+    using Lucene.Net.Support;
+    using NUnit.Framework;
+    using System.IO;
+    using AtomicReader = Lucene.Net.Index.AtomicReader;
+    using Automaton = Lucene.Net.Util.Automaton.Automaton;
+    using AutomatonTestUtil = Lucene.Net.Util.Automaton.AutomatonTestUtil;
+    using BasicAutomata = Lucene.Net.Util.Automaton.BasicAutomata;
+    using BasicOperations = Lucene.Net.Util.Automaton.BasicOperations;
+    using BytesRef = Lucene.Net.Util.BytesRef;
+    using CharacterRunAutomaton = Lucene.Net.Util.Automaton.CharacterRunAutomaton;
+    using DocsAndPositionsEnum = Lucene.Net.Index.DocsAndPositionsEnum;
+
+    /*
+         * Licensed to the Apache Software Foundation (ASF) under one or more
+         * contributor license agreements.  See the NOTICE file distributed with
+         * this work for additional information regarding copyright ownership.
+         * The ASF licenses this file to You under the Apache License, Version 2.0
+         * (the "License"); you may not use this file except in compliance with
+         * the License.  You may obtain a copy of the License at
+         *
+         *     http://www.apache.org/licenses/LICENSE-2.0
+         *
+         * Unless required by applicable law or agreed to in writing, software
+         * distributed under the License is distributed on an "AS IS" BASIS,
+         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+         * See the License for the specific language governing permissions and
+         * limitations under the License.
+         */
+
+    using Document = Documents.Document;
+    using Field = Field;
+    using Fields = Lucene.Net.Index.Fields;
+    using FieldType = FieldType;
+    using IOUtils = Lucene.Net.Util.IOUtils;
+    using RandomIndexWriter = Lucene.Net.Index.RandomIndexWriter;
+    using RegExp = Lucene.Net.Util.Automaton.RegExp;
+    using Terms = Lucene.Net.Index.Terms;
+    using TermsEnum = Lucene.Net.Index.TermsEnum;
+    using TestUtil = Lucene.Net.Util.TestUtil;
+
+    [TestFixture]
+    public class TestMockAnalyzer : BaseTokenStreamTestCase
+    {
+        /// <summary>
+        /// Test a configuration that behaves a lot like WhitespaceAnalyzer </summary>
+        [Test]
+        public virtual void TestWhitespace()
+        {
+            Analyzer a = new MockAnalyzer(Random());
+            AssertAnalyzesTo(a, "A bc defg hiJklmn opqrstuv wxy z ", new string[] { "a", "bc", "defg", "hijklmn", "opqrstuv", "wxy", "z" });
+            AssertAnalyzesTo(a, "aba cadaba shazam", new string[] { "aba", "cadaba", "shazam" });
+            AssertAnalyzesTo(a, "break on whitespace", new string[] { "break", "on", "whitespace" });
+        }
+
+        /// <summary>
+        /// Test a configuration that behaves a lot like SimpleAnalyzer </summary>
+        [Test]
+        public virtual void TestSimple()
+        {
+            Analyzer a = new MockAnalyzer(Random(), MockTokenizer.SIMPLE, true);
+            AssertAnalyzesTo(a, "a-bc123 defg+hijklmn567opqrstuv78wxy_z ", new string[] { "a", "bc", "defg", "hijklmn", "opqrstuv", "wxy", "z" });
+            AssertAnalyzesTo(a, "aba4cadaba-Shazam", new string[] { "aba", "cadaba", "shazam" });
+            AssertAnalyzesTo(a, "break+on/Letters", new string[] { "break", "on", "letters" });
+        }
+
+        /// <summary>
+        /// Test a configuration that behaves a lot like KeywordAnalyzer </summary>
+        [Test]
+        public virtual void TestKeyword()
+        {
+            Analyzer a = new MockAnalyzer(Random(), MockTokenizer.KEYWORD, false);
+            AssertAnalyzesTo(a, "a-bc123 defg+hijklmn567opqrstuv78wxy_z ", new string[] { "a-bc123 defg+hijklmn567opqrstuv78wxy_z " });
+            AssertAnalyzesTo(a, "aba4cadaba-Shazam", new string[] { "aba4cadaba-Shazam" });
+            AssertAnalyzesTo(a, "break+on/Nothing", new string[] { "break+on/Nothing" });
+            // currently though emits no tokens for empty string: maybe we can do it,
+            // but we don't want to emit tokens infinitely...
+            AssertAnalyzesTo(a, "", new string[0]);
+        }
+
+        // Test some regular expressions as tokenization patterns
+        /// <summary>
+        /// Test a configuration where each character is a term </summary>
+        [Test]
+        public virtual void TestSingleChar()
+        {
+            var single = new CharacterRunAutomaton((new RegExp(".")).ToAutomaton());
+            Analyzer a = new MockAnalyzer(Random(), single, false);
+            AssertAnalyzesTo(a, "foobar", new[] { "f", "o", "o", "b", "a", "r" }, new[] { 0, 1, 2, 3, 4, 5 }, new[] { 1, 2, 3, 4, 5, 6 });
+            CheckRandomData(Random(), a, 100);
+        }
+
+        /// <summary>
+        /// Test a configuration where two characters makes a term </summary>
+        [Test]
+        public virtual void TestTwoChars()
+        {
+            CharacterRunAutomaton single = new CharacterRunAutomaton((new RegExp("..")).ToAutomaton());
+            Analyzer a = new MockAnalyzer(Random(), single, false);
+            AssertAnalyzesTo(a, "foobar", new string[] { "fo", "ob", "ar" }, new int[] { 0, 2, 4 }, new int[] { 2, 4, 6 });
+            // make sure when last term is a "partial" match that End() is correct
+            AssertTokenStreamContents(a.TokenStream("bogus", new StringReader("fooba")), new string[] { "fo", "ob" }, new int[] { 0, 2 }, new int[] { 2, 4 }, new int[] { 1, 1 }, new int?(5));
+            CheckRandomData(Random(), a, 100);
+        }
+
+        /// <summary>
+        /// Test a configuration where three characters makes a term </summary>
+        [Test]
+        public virtual void TestThreeChars()
+        {
+            CharacterRunAutomaton single = new CharacterRunAutomaton((new RegExp("...")).ToAutomaton());
+            Analyzer a = new MockAnalyzer(Random(), single, false);
+            AssertAnalyzesTo(a, "foobar", new string[] { "foo", "bar" }, new int[] { 0, 3 }, new int[] { 3, 6 });
+            // make sure when last term is a "partial" match that End() is correct
+            AssertTokenStreamContents(a.TokenStream("bogus", new StringReader("fooba")), new string[] { "foo" }, new int[] { 0 }, new int[] { 3 }, new int[] { 1 }, new int?(5));
+            CheckRandomData(Random(), a, 100);
+        }
+
+        /// <summary>
+        /// Test a configuration where word starts with one uppercase </summary>
+        [Test]
+        public virtual void TestUppercase()
+        {
+            CharacterRunAutomaton single = new CharacterRunAutomaton((new RegExp("[A-Z][a-z]*")).ToAutomaton());
+            Analyzer a = new MockAnalyzer(Random(), single, false);
+            AssertAnalyzesTo(a, "FooBarBAZ", new string[] { "Foo", "Bar", "B", "A", "Z" }, new int[] { 0, 3, 6, 7, 8 }, new int[] { 3, 6, 7, 8, 9 });
+            AssertAnalyzesTo(a, "aFooBar", new string[] { "Foo", "Bar" }, new int[] { 1, 4 }, new int[] { 4, 7 });
+            CheckRandomData(Random(), a, 100);
+        }
+
+        /// <summary>
+        /// Test a configuration that behaves a lot like StopAnalyzer </summary>
+        [Test]
+        public virtual void TestStop()
+        {
+            Analyzer a = new MockAnalyzer(Random(), MockTokenizer.SIMPLE, true, MockTokenFilter.ENGLISH_STOPSET);
+            AssertAnalyzesTo(a, "the quick brown a fox", new string[] { "quick", "brown", "fox" }, new int[] { 2, 1, 2 });
+        }
+
+        /// <summary>
+        /// Test a configuration that behaves a lot like KeepWordFilter </summary>
+        [Test]
+        public virtual void TestKeep()
+        {
+            CharacterRunAutomaton keepWords = new CharacterRunAutomaton(BasicOperations.Complement(Automaton.Union(Arrays.AsList(BasicAutomata.MakeString("foo"), BasicAutomata.MakeString("bar")))));
+            Analyzer a = new MockAnalyzer(Random(), MockTokenizer.SIMPLE, true, keepWords);
+            AssertAnalyzesTo(a, "quick foo brown bar bar fox foo", new string[] { "foo", "bar", "bar", "foo" }, new int[] { 2, 2, 1, 2 });
+        }
+
+        /// <summary>
+        /// Test a configuration that behaves a lot like LengthFilter </summary>
+        [Test]
+        public virtual void TestLength()
+        {
+            CharacterRunAutomaton length5 = new CharacterRunAutomaton((new RegExp(".{5,}")).ToAutomaton());
+            Analyzer a = new MockAnalyzer(Random(), MockTokenizer.WHITESPACE, true, length5);
+            AssertAnalyzesTo(a, "ok toolong fine notfine", new string[] { "ok", "fine" }, new int[] { 1, 2 });
+        }
+
+        /// <summary>
+        /// Test MockTokenizer encountering a too long token </summary>
+        [Test]
+        public virtual void TestTooLongToken()
+        {
+            Analyzer whitespace = new AnalyzerAnonymousInnerClassHelper(this);
+            AssertTokenStreamContents(whitespace.TokenStream("bogus", new StringReader("test 123 toolong ok ")), new string[] { "test", "123", "toolo", "ng", "ok" }, new int[] { 0, 5, 9, 14, 17 }, new int[] { 4, 8, 14, 16, 19 }, new int?(20));
+            AssertTokenStreamContents(whitespace.TokenStream("bogus", new StringReader("test 123 toolo")), new string[] { "test", "123", "toolo" }, new int[] { 0, 5, 9 }, new int[] { 4, 8, 14 }, new int?(14));
+        }
+
+        private class AnalyzerAnonymousInnerClassHelper : Analyzer
+        {
+            private readonly TestMockAnalyzer OuterInstance;
+
+            public AnalyzerAnonymousInnerClassHelper(TestMockAnalyzer outerInstance)
+            {
+                this.OuterInstance = outerInstance;
+            }
+
+            protected internal override TokenStreamComponents CreateComponents(string fieldName, TextReader reader)
+            {
+                Tokenizer t = new MockTokenizer(reader, MockTokenizer.WHITESPACE, false, 5);
+                return new TokenStreamComponents(t, t);
+            }
+        }
+
+        [Test]
+        public virtual void TestLUCENE_3042()
+        {
+            string testString = "t";
+
+            Analyzer analyzer = new MockAnalyzer(Random());
+            Exception priorException = null;
+            TokenStream stream = analyzer.TokenStream("dummy", new StringReader(testString));
+            try
+            {
+                stream.Reset();
+                while (stream.IncrementToken())
+                {
+                    // consume
+                }
+                stream.End();
+            }
+            catch (Exception e)
+            {
+                priorException = e;
+            }
+            finally
+            {
+                IOUtils.CloseWhileHandlingException(priorException, stream);
+            }
+
+            AssertAnalyzesTo(analyzer, testString, new string[] { "t" });
+        }
+
+        /// <summary>
+        /// blast some random strings through the analyzer </summary>
+        [Test]
+        public virtual void TestRandomStrings()
+        {
+            CheckRandomData(Random(), new MockAnalyzer(Random()), AtLeast(1000));
+        }
+
+        /// <summary>
+        /// blast some random strings through differently configured tokenizers </summary>
+#if !NETSTANDARD
+        // LUCENENET: There is no Timeout on NUnit for .NET Core.
+        [Timeout(int.MaxValue)]
+#endif
+        [Test, LongRunningTest, HasTimeout]
+        public virtual void TestRandomRegexps()
+        {
+            int iters = AtLeast(30);
+            for (int i = 0; i < iters; i++)
+            {
+                CharacterRunAutomaton dfa = new CharacterRunAutomaton(AutomatonTestUtil.RandomAutomaton(Random()));
+                bool lowercase = Random().NextBoolean();
+                int limit = TestUtil.NextInt(Random(), 0, 500);
+                Analyzer a = new AnalyzerAnonymousInnerClassHelper2(this, dfa, lowercase, limit);
+                CheckRandomData(Random(), a, 100);
+                a.Dispose();
+            }
+        }
+
+        private class AnalyzerAnonymousInnerClassHelper2 : Analyzer
+        {
+            private readonly TestMockAnalyzer OuterInstance;
+
+            private CharacterRunAutomaton Dfa;
+            private bool Lowercase;
+            private int Limit;
+
+            public AnalyzerAnonymousInnerClassHelper2(TestMockAnalyzer outerInstance, CharacterRunAutomaton dfa, bool lowercase, int limit)
+            {
+                this.OuterInstance = outerInstance;
+                this.Dfa = dfa;
+                this.Lowercase = lowercase;
+                this.Limit = limit;
+            }
+
+            protected internal override TokenStreamComponents CreateComponents(string fieldName, TextReader reader)
+            {
+                Tokenizer t = new MockTokenizer(reader, Dfa, Lowercase, Limit);
+                return new TokenStreamComponents(t, t);
+            }
+        }
+
+        [Test]
+        public virtual void TestForwardOffsets()
+        {
+            int num = AtLeast(10000);
+            for (int i = 0; i < num; i++)
+            {
+                string s = TestUtil.RandomHtmlishString(Random(), 20);
+                StringReader reader = new StringReader(s);
+                MockCharFilter charfilter = new MockCharFilter(reader, 2);
+                MockAnalyzer analyzer = new MockAnalyzer(Random());
+                Exception priorException = null;
+                TokenStream ts = analyzer.TokenStream("bogus", charfilter.m_input);
+                try
+                {
+                    ts.Reset();
+                    while (ts.IncrementToken())
+                    {
+                        ;
+                    }
+                    ts.End();
+                }
+                catch (Exception e)
+                {
+                    priorException = e;
+                }
+                finally
+                {
+                    IOUtils.CloseWhileHandlingException(priorException, ts);
+                }
+            }
+        }
+
+        [Test]
+        public virtual void TestWrapReader()
+        {
+            // LUCENE-5153: test that wrapping an analyzer's reader is allowed
+            Random random = Random();
+
+            Analyzer @delegate = new MockAnalyzer(random);
+            Analyzer a = new AnalyzerWrapperAnonymousInnerClassHelper(this, @delegate.Strategy, @delegate);
+
+            CheckOneTerm(a, "abc", "aabc");
+        }
+
+        private class AnalyzerWrapperAnonymousInnerClassHelper : AnalyzerWrapper
+        {
+            private readonly TestMockAnalyzer OuterInstance;
+
+            private Analyzer @delegate;
+
+            public AnalyzerWrapperAnonymousInnerClassHelper(TestMockAnalyzer outerInstance, ReuseStrategy getReuseStrategy, Analyzer @delegate)
+                : base(getReuseStrategy)
+            {
+                this.OuterInstance = outerInstance;
+                this.@delegate = @delegate;
+            }
+
+            protected override TextReader WrapReader(string fieldName, TextReader reader)
+            {
+                return new MockCharFilter(reader, 7);
+            }
+
+            protected override TokenStreamComponents WrapComponents(string fieldName, TokenStreamComponents components)
+            {
+                return components;
+            }
+
+            protected override Analyzer GetWrappedAnalyzer(string fieldName)
+            {
+                return @delegate;
+            }
+        }
+
+        [Test]
+        public virtual void TestChangeGaps()
+        {
+            // LUCENE-5324: check that it is possible to change the wrapper's gaps
+            int positionGap = Random().Next(1000);
+            int offsetGap = Random().Next(1000);
+            Analyzer @delegate = new MockAnalyzer(Random());
+            Analyzer a = new AnalyzerWrapperAnonymousInnerClassHelper2(this, @delegate.Strategy, positionGap, offsetGap, @delegate);
+
+            RandomIndexWriter writer = new RandomIndexWriter(Random(), NewDirectory(), Similarity, TimeZone);
+            Document doc = new Document();
+            FieldType ft = new FieldType();
+            ft.IsIndexed = true;
+            ft.IndexOptions = IndexOptions.DOCS_ONLY;
+            ft.IsTokenized = true;
+            ft.StoreTermVectors = true;
+            ft.StoreTermVectorPositions = true;
+            ft.StoreTermVectorOffsets = true;
+            doc.Add(new Field("f", "a", ft));
+            doc.Add(new Field("f", "a", ft));
+            writer.AddDocument(doc, a);
+            AtomicReader reader = GetOnlySegmentReader(writer.Reader);
+            Fields fields = reader.GetTermVectors(0);
+            Terms terms = fields.GetTerms("f");
+            TermsEnum te = terms.GetIterator(null);
+            Assert.AreEqual(new BytesRef("a"), te.Next());
+            DocsAndPositionsEnum dpe = te.DocsAndPositions(null, null);
+            Assert.AreEqual(0, dpe.NextDoc());
+            Assert.AreEqual(2, dpe.Freq);
+            Assert.AreEqual(0, dpe.NextPosition());
+            Assert.AreEqual(0, dpe.StartOffset);
+            int endOffset = dpe.EndOffset;
+            Assert.AreEqual(1 + positionGap, dpe.NextPosition());
+            Assert.AreEqual(1 + endOffset + offsetGap, dpe.EndOffset);
+            Assert.AreEqual(null, te.Next());
+            reader.Dispose();
+            writer.Dispose();
+            writer.w.Directory.Dispose();
+        }
+
+        private class AnalyzerWrapperAnonymousInnerClassHelper2 : AnalyzerWrapper
+        {
+            private readonly TestMockAnalyzer OuterInstance;
+
+            private int PositionGap;
+            private int OffsetGap;
+            private Analyzer @delegate;
+
+            public AnalyzerWrapperAnonymousInnerClassHelper2(TestMockAnalyzer outerInstance, ReuseStrategy getReuseStrategy, int positionGap, int offsetGap, Analyzer @delegate)
+                : base(getReuseStrategy)
+            {
+                this.OuterInstance = outerInstance;
+                this.PositionGap = positionGap;
+                this.OffsetGap = offsetGap;
+                this.@delegate = @delegate;
+            }
+
+            protected override Analyzer GetWrappedAnalyzer(string fieldName)
+            {
+                return @delegate;
+            }
+
+            public override int GetPositionIncrementGap(string fieldName)
+            {
+                return PositionGap;
+            }
+
+            public override int GetOffsetGap(string fieldName)
+            {
+                return OffsetGap;
+            }
+        }
+    }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/lucenenet/blob/96822396/src/Lucene.Net.Tests/Analysis/TestMockCharFilter.cs
----------------------------------------------------------------------
diff --git a/src/Lucene.Net.Tests/Analysis/TestMockCharFilter.cs b/src/Lucene.Net.Tests/Analysis/TestMockCharFilter.cs
new file mode 100644
index 0000000..75fc8cd
--- /dev/null
+++ b/src/Lucene.Net.Tests/Analysis/TestMockCharFilter.cs
@@ -0,0 +1,59 @@
+using NUnit.Framework;
+using System.IO;
+
+namespace Lucene.Net.Analysis
+{
+    /*
+     * Licensed to the Apache Software Foundation (ASF) under one or more
+     * contributor license agreements.  See the NOTICE file distributed with
+     * this work for additional information regarding copyright ownership.
+     * The ASF licenses this file to You under the Apache License, Version 2.0
+     * (the "License"); you may not use this file except in compliance with
+     * the License.  You may obtain a copy of the License at
+     *
+     *     http://www.apache.org/licenses/LICENSE-2.0
+     *
+     * Unless required by applicable law or agreed to in writing, software
+     * distributed under the License is distributed on an "AS IS" BASIS,
+     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     * See the License for the specific language governing permissions and
+     * limitations under the License.
+     */
+
+    [TestFixture]
+    public class TestMockCharFilter : BaseTokenStreamTestCase
+    {
+        [Test]
+        public virtual void Test()
+        {
+            Analyzer analyzer = new AnalyzerAnonymousInnerClassHelper(this);
+
+            AssertAnalyzesTo(analyzer, "aab", new string[] { "aab" }, new int[] { 0 }, new int[] { 3 });
+
+            AssertAnalyzesTo(analyzer, "aabaa", new string[] { "aabaa" }, new int[] { 0 }, new int[] { 5 });
+
+            AssertAnalyzesTo(analyzer, "aabcdefgaa", new string[] { "aabcdefgaa" }, new int[] { 0 }, new int[] { 10 });
+        }
+
+        private class AnalyzerAnonymousInnerClassHelper : Analyzer
+        {
+            private readonly TestMockCharFilter OuterInstance;
+
+            public AnalyzerAnonymousInnerClassHelper(TestMockCharFilter outerInstance)
+            {
+                this.OuterInstance = outerInstance;
+            }
+
+            protected internal override TokenStreamComponents CreateComponents(string fieldName, TextReader reader)
+            {
+                Tokenizer tokenizer = new MockTokenizer(reader, MockTokenizer.WHITESPACE, false);
+                return new TokenStreamComponents(tokenizer, tokenizer);
+            }
+
+            protected internal override TextReader InitReader(string fieldName, TextReader reader)
+            {
+                return new MockCharFilter(reader, 7);
+            }
+        }
+    }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/lucenenet/blob/96822396/src/Lucene.Net.Tests/Analysis/TestNumericTokenStream.cs
----------------------------------------------------------------------
diff --git a/src/Lucene.Net.Tests/Analysis/TestNumericTokenStream.cs b/src/Lucene.Net.Tests/Analysis/TestNumericTokenStream.cs
new file mode 100644
index 0000000..8c020e4
--- /dev/null
+++ b/src/Lucene.Net.Tests/Analysis/TestNumericTokenStream.cs
@@ -0,0 +1,144 @@
+using Lucene.Net.Analysis.TokenAttributes;
+
+namespace Lucene.Net.Analysis
+{
+    using NUnit.Framework;
+    using System;
+
+    /*
+         * Licensed to the Apache Software Foundation (ASF) under one or more
+         * contributor license agreements.  See the NOTICE file distributed with
+         * this work for additional information regarding copyright ownership.
+         * The ASF licenses this file to You under the Apache License, Version 2.0
+         * (the "License"); you may not use this file except in compliance with
+         * the License.  You may obtain a copy of the License at
+         *
+         *     http://www.apache.org/licenses/LICENSE-2.0
+         *
+         * Unless required by applicable law or agreed to in writing, software
+         * distributed under the License is distributed on an "AS IS" BASIS,
+         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+         * See the License for the specific language governing permissions and
+         * limitations under the License.
+         */
+
+    using BytesRef = Lucene.Net.Util.BytesRef;
+    using CharTermAttribute = Lucene.Net.Analysis.TokenAttributes.CharTermAttribute;
+    using ICharTermAttribute = Lucene.Net.Analysis.TokenAttributes.ICharTermAttribute;
+    using NumericUtils = Lucene.Net.Util.NumericUtils;
+
+    [TestFixture]
+    public class TestNumericTokenStream : BaseTokenStreamTestCase
+    {
+        internal const long Lvalue = 4573245871874382L;
+        internal const int Ivalue = 123456;
+
+        [NUnit.Framework.Test]
+        public virtual void TestLongStream()
+        {
+            using (NumericTokenStream stream = (new NumericTokenStream()).SetInt64Value(Lvalue)) {
+                // use getAttribute to test if attributes really exist, if not an IAE will be throwed
+                ITermToBytesRefAttribute bytesAtt = stream.GetAttribute<ITermToBytesRefAttribute>();
+                ITypeAttribute typeAtt = stream.GetAttribute<ITypeAttribute>();
+                NumericTokenStream.INumericTermAttribute numericAtt = stream.GetAttribute<NumericTokenStream.INumericTermAttribute>();
+                BytesRef bytes = bytesAtt.BytesRef;
+                stream.Reset();
+                Assert.AreEqual(64, numericAtt.ValueSize);
+                for (int shift = 0; shift < 64; shift += NumericUtils.PRECISION_STEP_DEFAULT)
+                {
+                    Assert.IsTrue(stream.IncrementToken(), "New token is available");
+                    Assert.AreEqual(shift, numericAtt.Shift, "Shift value wrong");
+                    bytesAtt.FillBytesRef();
+                    Assert.AreEqual(Lvalue & ~((1L << shift) - 1L), NumericUtils.PrefixCodedToInt64(bytes), "Term is incorrectly encoded");
+                    Assert.AreEqual(Lvalue & ~((1L << shift) - 1L), numericAtt.RawValue, "Term raw value is incorrectly encoded");
+                    Assert.AreEqual((shift == 0) ? NumericTokenStream.TOKEN_TYPE_FULL_PREC : NumericTokenStream.TOKEN_TYPE_LOWER_PREC, typeAtt.Type, "Type incorrect");
+                }
+                Assert.IsFalse(stream.IncrementToken(), "More tokens available");
+                stream.End();
+            }
+        }
+
+        [NUnit.Framework.Test]
+        public virtual void TestIntStream()
+        {
+            NumericTokenStream stream = (new NumericTokenStream()).SetInt32Value(Ivalue);
+            // use getAttribute to test if attributes really exist, if not an IAE will be throwed
+            ITermToBytesRefAttribute bytesAtt = stream.GetAttribute<ITermToBytesRefAttribute>();
+            ITypeAttribute typeAtt = stream.GetAttribute<ITypeAttribute>();
+            NumericTokenStream.INumericTermAttribute numericAtt = stream.GetAttribute<NumericTokenStream.INumericTermAttribute>();
+            BytesRef bytes = bytesAtt.BytesRef;
+            stream.Reset();
+            Assert.AreEqual(32, numericAtt.ValueSize);
+            for (int shift = 0; shift < 32; shift += NumericUtils.PRECISION_STEP_DEFAULT)
+            {
+                Assert.IsTrue(stream.IncrementToken(), "New token is available");
+                Assert.AreEqual(shift, numericAtt.Shift, "Shift value wrong");
+                bytesAtt.FillBytesRef();
+                Assert.AreEqual(Ivalue & ~((1 << shift) - 1), NumericUtils.PrefixCodedToInt32(bytes), "Term is incorrectly encoded");
+                Assert.AreEqual(((long)Ivalue) & ~((1L << shift) - 1L), numericAtt.RawValue, "Term raw value is incorrectly encoded");
+                Assert.AreEqual((shift == 0) ? NumericTokenStream.TOKEN_TYPE_FULL_PREC : NumericTokenStream.TOKEN_TYPE_LOWER_PREC, typeAtt.Type, "Type incorrect");
+            }
+            Assert.IsFalse(stream.IncrementToken(), "More tokens available");
+            stream.End();
+            stream.Dispose();
+        }
+
+        [NUnit.Framework.Test]
+        public virtual void TestNotInitialized()
+        {
+            NumericTokenStream stream = new NumericTokenStream();
+
+            try
+            {
+                stream.Reset();
+                Assert.Fail("reset() should not succeed.");
+            }
+            catch (Exception)
+            {
+                // pass
+            }
+
+            try
+            {
+                stream.IncrementToken();
+                Assert.Fail("IncrementToken() should not succeed.");
+            }
+            catch (Exception)
+            {
+                // pass
+            }
+        }
+
+        public interface ITestAttribute : ICharTermAttribute
+        {
+        }
+
+        public class TestAttribute : CharTermAttribute, ITestAttribute
+        {
+        }
+
+        [NUnit.Framework.Test]
+        public virtual void TestCTA()
+        {
+            NumericTokenStream stream = new NumericTokenStream();
+            try
+            {
+                stream.AddAttribute<ICharTermAttribute>();
+                Assert.Fail("Succeeded to add CharTermAttribute.");
+            }
+            catch (System.ArgumentException iae)
+            {
+                Assert.IsTrue(iae.Message.StartsWith("NumericTokenStream does not support"));
+            }
+            try
+            {
+                stream.AddAttribute<ITestAttribute>();
+                Assert.Fail("Succeeded to add TestAttribute.");
+            }
+            catch (System.ArgumentException iae)
+            {
+                Assert.IsTrue(iae.Message.StartsWith("NumericTokenStream does not support"));
+            }
+        }
+    }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/lucenenet/blob/96822396/src/Lucene.Net.Tests/Analysis/TestPosition.cs
----------------------------------------------------------------------
diff --git a/src/Lucene.Net.Tests/Analysis/TestPosition.cs b/src/Lucene.Net.Tests/Analysis/TestPosition.cs
new file mode 100644
index 0000000..54eb089
--- /dev/null
+++ b/src/Lucene.Net.Tests/Analysis/TestPosition.cs
@@ -0,0 +1,27 @@
+namespace Lucene.Net.Analysis
+{
+    /*
+     * Licensed to the Apache Software Foundation (ASF) under one or more
+     * contributor license agreements.  See the NOTICE file distributed with
+     * this work for additional information regarding copyright ownership.
+     * The ASF licenses this file to You under the Apache License, Version 2.0
+     * (the "License"); you may not use this file except in compliance with
+     * the License.  You may obtain a copy of the License at
+     *
+     *     http://www.apache.org/licenses/LICENSE-2.0
+     *
+     * Unless required by applicable law or agreed to in writing, software
+     * distributed under the License is distributed on an "AS IS" BASIS,
+     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     * See the License for the specific language governing permissions and
+     * limitations under the License.
+     */
+
+    /// <summary>
+    /// Trivial position class.
+    /// </summary>
+    public class TestPosition : LookaheadTokenFilter.Position
+    {
+        public virtual string Fact { get; set; }
+    }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/lucenenet/blob/96822396/src/Lucene.Net.Tests/Analysis/TestReusableStringReader.cs
----------------------------------------------------------------------
diff --git a/src/Lucene.Net.Tests/Analysis/TestReusableStringReader.cs b/src/Lucene.Net.Tests/Analysis/TestReusableStringReader.cs
new file mode 100644
index 0000000..150a3f8
--- /dev/null
+++ b/src/Lucene.Net.Tests/Analysis/TestReusableStringReader.cs
@@ -0,0 +1,71 @@
+using System.Text;
+
+namespace Lucene.Net.Analysis
+{
+    using NUnit.Framework;
+    using LuceneTestCase = Lucene.Net.Util.LuceneTestCase;
+
+    /*
+     * Licensed to the Apache Software Foundation (ASF) under one or more
+     * contributor license agreements.  See the NOTICE file distributed with
+     * this work for additional information regarding copyright ownership.
+     * The ASF licenses this file to You under the Apache License, Version 2.0
+     * (the "License"); you may not use this file except in compliance with
+     * the License.  You may obtain a copy of the License at
+     *
+     *     http://www.apache.org/licenses/LICENSE-2.0
+     *
+     * Unless required by applicable law or agreed to in writing, software
+     * distributed under the License is distributed on an "AS IS" BASIS,
+     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     * See the License for the specific language governing permissions and
+     * limitations under the License.
+     */
+
+    [TestFixture]
+    public class TestReusableStringReader : LuceneTestCase
+    {
+        [Test]
+        public virtual void Test()
+        {
+            char[] buf = new char[4];
+
+            using (ReusableStringReader reader = new ReusableStringReader())
+            {
+                Assert.AreEqual(-1, reader.Read());
+                Assert.AreEqual(-1, reader.Read(new char[1], 0, 1));
+                Assert.AreEqual(-1, reader.Read(new char[2], 1, 1));
+                //Assert.AreEqual(-1, reader.Read(CharBuffer.wrap(new char[2])));
+
+                reader.SetValue("foobar");
+                Assert.AreEqual(4, reader.Read(buf, 0, 4));
+                Assert.AreEqual("foob", new string(buf));
+                Assert.AreEqual(2, reader.Read(buf, 0, 2));
+                Assert.AreEqual("ar", new string(buf, 0, 2));
+                Assert.AreEqual(-1, reader.Read(buf, 2, 0));
+            }
+
+            using (ReusableStringReader reader = new ReusableStringReader())
+            {
+                reader.SetValue("foobar");
+                Assert.AreEqual(0, reader.Read(buf, 1, 0));
+                Assert.AreEqual(3, reader.Read(buf, 1, 3));
+                Assert.AreEqual("foo", new string(buf, 1, 3));
+                Assert.AreEqual(2, reader.Read(buf, 2, 2));
+                Assert.AreEqual("ba", new string(buf, 2, 2));
+                Assert.AreEqual('r', (char)reader.Read());
+                Assert.AreEqual(-1, reader.Read(buf, 2, 0));
+                reader.Dispose();
+
+                reader.SetValue("foobar");
+                StringBuilder sb = new StringBuilder();
+                int ch;
+                while ((ch = reader.Read()) != -1)
+                {
+                    sb.Append((char)ch);
+                }
+                Assert.AreEqual("foobar", sb.ToString());
+            }
+        }
+    }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/lucenenet/blob/96822396/src/Lucene.Net.Tests/Analysis/TestToken.cs
----------------------------------------------------------------------
diff --git a/src/Lucene.Net.Tests/Analysis/TestToken.cs b/src/Lucene.Net.Tests/Analysis/TestToken.cs
new file mode 100644
index 0000000..5e3fa66
--- /dev/null
+++ b/src/Lucene.Net.Tests/Analysis/TestToken.cs
@@ -0,0 +1,305 @@
+using System.Collections.Generic;
+using System.Text;
+
+namespace Lucene.Net.Analysis
+{
+    /*
+     * Licensed to the Apache Software Foundation (ASF) under one or more
+     * contributor license agreements.  See the NOTICE file distributed with
+     * this work for additional information regarding copyright ownership.
+     * The ASF licenses this file to You under the Apache License, Version 2.0
+     * (the "License"); you may not use this file except in compliance with
+     * the License.  You may obtain a copy of the License at
+     *
+     *     http://www.apache.org/licenses/LICENSE-2.0
+     *
+     * Unless required by applicable law or agreed to in writing, software
+     * distributed under the License is distributed on an "AS IS" BASIS,
+     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     * See the License for the specific language governing permissions and
+     * limitations under the License.
+     */
+
+    using Lucene.Net.Analysis.TokenAttributes;
+    using NUnit.Framework;
+    using Attribute = Lucene.Net.Util.Attribute;
+    using BytesRef = Lucene.Net.Util.BytesRef;
+    using IAttribute = Lucene.Net.Util.IAttribute;
+    using LuceneTestCase = Lucene.Net.Util.LuceneTestCase;
+    using TestUtil = Lucene.Net.Util.TestUtil;
+
+    [TestFixture]
+    public class TestToken : LuceneTestCase
+    {
+        [Test]
+        public virtual void TestCtor()
+        {
+            Token t = new Token();
+            char[] content = "hello".ToCharArray();
+            t.CopyBuffer(content, 0, content.Length);
+            Assert.AreNotSame(t.Buffer, content);
+            Assert.AreEqual(0, t.StartOffset);
+            Assert.AreEqual(0, t.EndOffset);
+            Assert.AreEqual("hello", t.ToString());
+            Assert.AreEqual("word", t.Type);
+            Assert.AreEqual(0, t.Flags);
+
+            t = new Token(6, 22);
+            t.CopyBuffer(content, 0, content.Length);
+            Assert.AreEqual("hello", t.ToString());
+            Assert.AreEqual("hello", t.ToString());
+            Assert.AreEqual(6, t.StartOffset);
+            Assert.AreEqual(22, t.EndOffset);
+            Assert.AreEqual("word", t.Type);
+            Assert.AreEqual(0, t.Flags);
+
+            t = new Token(6, 22, 7);
+            t.CopyBuffer(content, 0, content.Length);
+            Assert.AreEqual("hello", t.ToString());
+            Assert.AreEqual("hello", t.ToString());
+            Assert.AreEqual(6, t.StartOffset);
+            Assert.AreEqual(22, t.EndOffset);
+            Assert.AreEqual("word", t.Type);
+            Assert.AreEqual(7, t.Flags);
+
+            t = new Token(6, 22, "junk");
+            t.CopyBuffer(content, 0, content.Length);
+            Assert.AreEqual("hello", t.ToString());
+            Assert.AreEqual("hello", t.ToString());
+            Assert.AreEqual(6, t.StartOffset);
+            Assert.AreEqual(22, t.EndOffset);
+            Assert.AreEqual("junk", t.Type);
+            Assert.AreEqual(0, t.Flags);
+        }
+
+        [Test]
+        public virtual void TestResize()
+        {
+            Token t = new Token();
+            char[] content = "hello".ToCharArray();
+            t.CopyBuffer(content, 0, content.Length);
+            for (int i = 0; i < 2000; i++)
+            {
+                t.ResizeBuffer(i);
+                Assert.IsTrue(i <= t.Buffer.Length);
+                Assert.AreEqual("hello", t.ToString());
+            }
+        }
+
+        [Test]
+        public virtual void TestGrow()
+        {
+            Token t = new Token();
+            StringBuilder buf = new StringBuilder("ab");
+            for (int i = 0; i < 20; i++)
+            {
+                char[] content = buf.ToString().ToCharArray();
+                t.CopyBuffer(content, 0, content.Length);
+                Assert.AreEqual(buf.Length, t.Length);
+                Assert.AreEqual(buf.ToString(), t.ToString());
+                buf.Append(buf.ToString());
+            }
+            Assert.AreEqual(1048576, t.Length);
+
+            // now as a string, second variant
+            t = new Token();
+            buf = new StringBuilder("ab");
+            for (int i = 0; i < 20; i++)
+            {
+                t.SetEmpty().Append(buf);
+                string content = buf.ToString();
+                Assert.AreEqual(content.Length, t.Length);
+                Assert.AreEqual(content, t.ToString());
+                buf.Append(content);
+            }
+            Assert.AreEqual(1048576, t.Length);
+
+            // Test for slow growth to a long term
+            t = new Token();
+            buf = new StringBuilder("a");
+            for (int i = 0; i < 20000; i++)
+            {
+                t.SetEmpty().Append(buf);
+                string content = buf.ToString();
+                Assert.AreEqual(content.Length, t.Length);
+                Assert.AreEqual(content, t.ToString());
+                buf.Append("a");
+            }
+            Assert.AreEqual(20000, t.Length);
+
+            // Test for slow growth to a long term
+            t = new Token();
+            buf = new StringBuilder("a");
+            for (int i = 0; i < 20000; i++)
+            {
+                t.SetEmpty().Append(buf);
+                string content = buf.ToString();
+                Assert.AreEqual(content.Length, t.Length);
+                Assert.AreEqual(content, t.ToString());
+                buf.Append("a");
+            }
+            Assert.AreEqual(20000, t.Length);
+        }
+
+        [Test]
+        public virtual void TestToString()
+        {
+            char[] b = new char[] { 'a', 'l', 'o', 'h', 'a' };
+            Token t = new Token("", 0, 5);
+            t.CopyBuffer(b, 0, 5);
+            Assert.AreEqual("aloha", t.ToString());
+
+            t.SetEmpty().Append("hi there");
+            Assert.AreEqual("hi there", t.ToString());
+        }
+
+        [Test]
+        public virtual void TestTermBufferEquals()
+        {
+            Token t1a = new Token();
+            char[] content1a = "hello".ToCharArray();
+            t1a.CopyBuffer(content1a, 0, 5);
+            Token t1b = new Token();
+            char[] content1b = "hello".ToCharArray();
+            t1b.CopyBuffer(content1b, 0, 5);
+            Token t2 = new Token();
+            char[] content2 = "hello2".ToCharArray();
+            t2.CopyBuffer(content2, 0, 6);
+            Assert.IsTrue(t1a.Equals(t1b));
+            Assert.IsFalse(t1a.Equals(t2));
+            Assert.IsFalse(t2.Equals(t1b));
+        }
+
+        [Test]
+        public virtual void TestMixedStringArray()
+        {
+            Token t = new Token("hello", 0, 5);
+            Assert.AreEqual(t.Length, 5);
+            Assert.AreEqual(t.ToString(), "hello");
+            t.SetEmpty().Append("hello2");
+            Assert.AreEqual(t.Length, 6);
+            Assert.AreEqual(t.ToString(), "hello2");
+            t.CopyBuffer("hello3".ToCharArray(), 0, 6);
+            Assert.AreEqual(t.ToString(), "hello3");
+
+            char[] buffer = t.Buffer;
+            buffer[1] = 'o';
+            Assert.AreEqual(t.ToString(), "hollo3");
+        }
+
+        [Test]
+        public virtual void TestClone()
+        {
+            Token t = new Token(0, 5);
+            char[] content = "hello".ToCharArray();
+            t.CopyBuffer(content, 0, 5);
+            char[] buf = t.Buffer;
+            Token copy = AssertCloneIsEqual(t);
+            Assert.AreEqual(t.ToString(), copy.ToString());
+            Assert.AreNotSame(buf, copy.Buffer);
+
+            BytesRef pl = new BytesRef(new byte[] { 1, 2, 3, 4 });
+            t.Payload = pl;
+            copy = AssertCloneIsEqual(t);
+            Assert.AreEqual(pl, copy.Payload);
+            Assert.AreNotSame(pl, copy.Payload);
+        }
+
+        [Test]
+        public virtual void TestCopyTo()
+        {
+            Token t = new Token();
+            Token copy = AssertCopyIsEqual(t);
+            Assert.AreEqual("", t.ToString());
+            Assert.AreEqual("", copy.ToString());
+
+            t = new Token(0, 5);
+            char[] content = "hello".ToCharArray();
+            t.CopyBuffer(content, 0, 5);
+            char[] buf = t.Buffer;
+            copy = AssertCopyIsEqual(t);
+            Assert.AreEqual(t.ToString(), copy.ToString());
+            Assert.AreNotSame(buf, copy.Buffer);
+
+            BytesRef pl = new BytesRef(new byte[] { 1, 2, 3, 4 });
+            t.Payload = pl;
+            copy = AssertCopyIsEqual(t);
+            Assert.AreEqual(pl, copy.Payload);
+            Assert.AreNotSame(pl, copy.Payload);
+        }
+
+        public interface ISenselessAttribute : Lucene.Net.Util.IAttribute
+        {
+        }
+
+        public sealed class SenselessAttribute : Attribute, ISenselessAttribute
+        {
+            public override void CopyTo(IAttribute target)
+            {
+            }
+
+            public override void Clear()
+            {
+            }
+
+            public override bool Equals(object o)
+            {
+                return (o is SenselessAttribute);
+            }
+
+            public override int GetHashCode()
+            {
+                return 0;
+            }
+        }
+
+        [Test]
+        public virtual void TestTokenAttributeFactory()
+        {
+            TokenStream ts = new MockTokenizer(Token.TOKEN_ATTRIBUTE_FACTORY, new System.IO.StringReader("foo bar"), MockTokenizer.WHITESPACE, false, MockTokenizer.DEFAULT_MAX_TOKEN_LENGTH);
+
+            Assert.IsTrue(ts.AddAttribute<ISenselessAttribute>() is SenselessAttribute, "SenselessAttribute is not implemented by SenselessAttributeImpl");
+
+            Assert.IsTrue(ts.AddAttribute<ICharTermAttribute>() is Token, "CharTermAttribute is not implemented by Token");
+            Assert.IsTrue(ts.AddAttribute<IOffsetAttribute>() is Token, "OffsetAttribute is not implemented by Token");
+            Assert.IsTrue(ts.AddAttribute<IFlagsAttribute>() is Token, "FlagsAttribute is not implemented by Token");
+            Assert.IsTrue(ts.AddAttribute<IPayloadAttribute>() is Token, "PayloadAttribute is not implemented by Token");
+            Assert.IsTrue(ts.AddAttribute<IPositionIncrementAttribute>() is Token, "PositionIncrementAttribute is not implemented by Token");
+            Assert.IsTrue(ts.AddAttribute<ITypeAttribute>() is Token, "TypeAttribute is not implemented by Token");
+        }
+
+        [Test]
+        public virtual void TestAttributeReflection()
+        {
+            Token t = new Token("foobar", 6, 22, 8);
+            TestUtil.AssertAttributeReflection(t, new Dictionary<string, object>()
+            {
+                { typeof(ICharTermAttribute).Name + "#term", "foobar" },
+                { typeof(ITermToBytesRefAttribute).Name + "#bytes", new BytesRef("foobar") },
+                { typeof(IOffsetAttribute).Name + "#startOffset", 6 },
+                { typeof(IOffsetAttribute).Name + "#endOffset", 22 },
+                { typeof(IPositionIncrementAttribute).Name + "#positionIncrement", 1 },
+                { typeof(IPayloadAttribute).Name + "#payload", null },
+                { typeof(ITypeAttribute).Name + "#type", TypeAttribute_Fields.DEFAULT_TYPE },
+                { typeof(IFlagsAttribute).Name + "#flags", 8 }
+            });
+        }
+
+        public static T AssertCloneIsEqual<T>(T att) where T : Attribute
+        {
+            T clone = (T)att.Clone();
+            Assert.AreEqual(att, clone, "Clone must be equal");
+            Assert.AreEqual(att.GetHashCode(), clone.GetHashCode(), "Clone's hashcode must be equal");
+            return clone;
+        }
+
+        public static T AssertCopyIsEqual<T>(T att) where T : Attribute
+        {
+            T copy = (T)System.Activator.CreateInstance(att.GetType());
+            att.CopyTo(copy);
+            Assert.AreEqual(att, copy, "Copied instance must be equal");
+            Assert.AreEqual(att.GetHashCode(), copy.GetHashCode(), "Copied instance's hashcode must be equal");
+            return copy;
+        }
+    }
+}
\ No newline at end of file


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