NUnit and TestCaseAttribute, cross-join of parameters possible?

Question

I have a unit-test that tests a variety of cases, like this:

public void Test1(Int32 a, Int32 b, Int32 c)

Let's say I want to create test-code without a loop, so I want to use TestCase to specify parameters like this:

[TestCase(1, 1, 1)]
public void Test1(Int32 a, Int32 b, Int32 c)

Is it possible for me with this attribute to say this:

• For the first parameter, here's a set of values
• For the second parameter, here's a set of values
• For the third parameter, here's a set of values
• Now, test all combinations of the above

Ie. something like this:

[TestCase(new[] { 1, 2, 3, 4 }, new[] { 1, 2, 3, 4 }, new[] { 1, 2, 3, 4 })]
public void Test1(Int32 a, Int32 b, Int32 c)

Doesn't seem like it, but perhaps I'm overlooking something?

Howlond

Answer 1

NUnit provides the Values attribute which can be used together with Combinatorial attribute to achieve this:

[Test, Combinatorial]
public void Test1( 
    [Values(1,2,3,4)] Int32 a, 
    [Values(1,2,3,4)] Int32 b, 
    [Values(1,2,3,4)] Int32 c
)
{
    ...
}

Airily

That worked, and Combinatorial is apparently the default as well, intellisense doc said that, and I tried without that particular attribute and it worked exactly like you said it would. Thanks a bunch. – Howlond

@LasseV.Karlsen In addition to the Values attribute, the Range attribute can also be used in the same manner. Instead of explicitly listing all of the values, they can be specified as a range. So, in your example, instead of [Values(1,2,3,4)], you can substitute with [Range(1,4,1)]. – Epsom