Re: Status of Data Driven tests

Hi Charlie,

> I'm resending this, since it didn't seem to be accepted the first time.
>
> Hi All,
>
> I have a basic skeleton for static test data applied
> to methods in the manner of RowTest.
>
> These work...
>
> [TestCase(2, 2, 4)]
> public void TestMethod(int a, int b, int sum) 
> {
>    Assert.AreEqual( sum, a + b ); 
> }
>
> [TestCase(2, 2, 4)]
> [TestCase(10, 1, 11)]
> [TestCase(2, -2, 0)]
> public void TestMethod(int a, int b, int sum)
> {
>    Assert.AreEqual( sum, a + b ); 
> }
>
> In the first example, the test is shown right under the fixture.
> In the second, a group is created, with the tests under it
> just as in RowTest.
>
> A few differences in my implementation...
> * Mismatched args are non-runnable rather than throwing
> an exception at runtime.
> * It works on static methods as well as instance methods
>
> I haven't yet implemented ExpectedException, TestName
> or Description, but they seem straightforward enough.
> Do we need/want all these?
>   
Well, TestName was actually a feature request from a user of the RowTest 
extension. I think that ExpectedException makes sense. Without it, it's 
hard to verify that invalid input specified in the TestCase attribute 
should cause an exception to be thrown.

> I'll add use of a property or method to return argument
> lists in the fashion of IterativeTest.
>
> I'm considering allowing methods with return values, with
> the test cases specifying the expected value and NUnit
> doing an automatic assertion on equality.
>
> [TestCase(2, 2, Expect=4)]
> [TestCase(10, 1, Expect=11)]
> [TestCase(2, -2, Expect=0)]
> public int TestMethod()
> {
>     return MyAddMethod(a, b); 
> }
>
> This would allow something very close to testing
> the production code directly. Does it look like
> it might be useful?
>   
Nice idea. It makes the expected result distinguishable from the input.


Andreas


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