NUnit cannot recognise a TestCase when it contains an array

Question

This is quite simple but annoying behaviour I am running into with NUnit:

I have some tests like this:

[Test]
[TestCase( 1, 2, "hello" )]
[TestCase( 3, 5, "goodbye" )]
public void MyClass_MyMethod( int a, int b, string c )
{
    Assert.IsTrue( a < b );
}

This works fine and in the ReSharper NUnit pane I can see each TestCase getting its own response in the result.

I have a second TestCase that looks like this:

[Test]
[TestCase( 1, 2, new long[] { 100, 200 })]
[TestCase( 5, 3, new long[] { 300, 500 })]
public void MyClass_MyOtherMethod( long a, long b, long[] bunchOfNumbers )
{
   Assert.IsTrue( a < b );
}

When I run it I see this:

One or more child tests had errors Exception doesn't have a stacktrace

public void MyClass_MyOtherMethod(5,3,System.Int64[]) failed

The difference being that with my other tests it draws out each TestCase as a separate checkbox on the test list, whereas this one does not get shown and I have no detail until I run it in a debugger as to what went wrong and where. I am a little concerned about how this test will behave on the build machine. Does anyone have any idea what is going on and why?

Answer 1

Following on from this bug at JetBrains it looks as though the solution here is to use the TestName attribute on your different cases:

[Test]
[TestCase( 1, 2, new long[] { 100, 200 }, TestName="Test 1" )]
[TestCase( 5, 3, new long[] { 300, 500 }, TestName="Test 2" )]
public void MyClass_MyOtherMethod( long a, long b, long[] bunchOfNumbers )
{
   Assert.IsTrue( a < b );
}

Everything now shows correctly in ReSharper if one of my tests fails.