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From paul-rogers <...@git.apache.org>
Subject [GitHub] drill pull request #851: DRILL-5518: Test framework enhancements
Date Thu, 22 Jun 2017 17:14:10 GMT
Github user paul-rogers commented on a diff in the pull request:

    https://github.com/apache/drill/pull/851#discussion_r123567359
  
    --- Diff: exec/java-exec/src/test/java/org/apache/drill/test/rowSet/test/RowSetTest.java
---
    @@ -309,13 +317,38 @@ private void testDoubleRW() {
         assertEquals(0, reader.column(0).getDouble(), 0.000001);
         assertTrue(reader.next());
         assertEquals(Double.MAX_VALUE, reader.column(0).getDouble(), 0.000001);
    +    assertEquals(Double.MAX_VALUE, (double) reader.column(0).getObject(), 0.000001);
    --- End diff --
    
    The trick here is to understand the difference between static and dynamic typing. The
run-time type of `getObject()` is `Double`, which can be unboxed to an int. But, Java is a
statically-typed language. The compile-time type of `getObject()` is `Object`.
    
    For the two-argument form of `assertEquals()`, that is fine: Java will box the `int` to
get an `Integer`, pass both to `assertEquals()` which will call `equals()` on the objects
and things work.
    
    But, the three-argument form has the signature `assertEquals(double expected, double actual,
double delta)`, and the compiler does not have sufficient information to convert the `Object`
return value to a `double`. Here is the error:
    
    ```
    The method assertEquals(double, double, double) in the type Assert is not applicable for
the arguments (double, Object, double)
    ```


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