Ignore only class level parameters in NUnit tests is not possible

[tom-englert]

Describe the bug

It's not possible to ignore only the class level parameters of an NUnit test, but include the method level parameters.

Minimal Repro

These are the combinations I tried:

[TestFixture("1")]
[TestFixture("2")]
public class ClassLevelParams2(string arg1)
{
    [TestCase("3")]
    [TestCase("4")]
    public Task IgnoreClassLevelParametersOnly_Attempt1(string arg2) =>
        Verify(arg2)
            .IgnoreParametersForVerified(arg1);

    [TestCase("3")]
    [TestCase("4")]
    public Task IgnoreClassLevelParametersOnly_Attempt2(string arg2) =>
        Verify(arg2)
            .IgnoreParametersForVerified(arg2);

    [TestCase("3")]
    [TestCase("4")]
    public Task IgnoreClassLevelParametersOnly_Attempt3(string arg2) =>
        Verify(arg2)
            .UseParameters(arg2);

    [TestCase("3")]
    [TestCase("4")]
    public Task IgnoreClassLevelParametersOnly_Attempt4(string arg2) =>
        Verify(arg2)
            .UseParameters(arg2)
            .DisableRequireUniquePrefix();

}

These are the files created:

ClassLevelParams2.IgnoreClassLevelParametersOnly_Attempt1.verified.txt
ClassLevelParams2.IgnoreClassLevelParametersOnly_Attempt2.verified.txt
ClassLevelParams2.IgnoreClassLevelParametersOnly_Attempt3_arg1=3.verified.txt
ClassLevelParams2.IgnoreClassLevelParametersOnly_Attempt3_arg1=4.verified.txt
ClassLevelParams2.IgnoreClassLevelParametersOnly_Attempt4_arg1=3.verified.txt
ClassLevelParams2.IgnoreClassLevelParametersOnly_Attempt4_arg1=4.verified.txt

Attempt 1 & 2 fail because no parameters are used at all.
Attempt 3 fails partially with " System.Exception : The prefix has already been used"
Attempt 4 works, however like in 3 the name of the parameter is wrong, should be arg2

[tom-englert]

After looking at the code again, it seems that:

• The arguments specified in the method IgnoreParametersForVerified actually don't have any effect.
• UseParameters implicitly maps parameters by index, where the first parameter here is the class parameter.

So I managed to do this workaround:

    [TestCase("3")]
    [TestCase("4")]
    public Task IgnoreClassLevelParametersOnly_Workaround(string arg2) =>
        Verify(arg2)
            .UseParameters("Any", arg2)
            .DisableRequireUniquePrefix();

However it would be more intuitive use the parameters of IgnoreParametersForVerified and allow to specify parameter names to be skipped.