Nunit组合引发TargetParameterCountException

Question

I have some test like this:

[Test, Combinatorial]
public void SomeTest(
        [Values(false, true)] bool flag,
        [Values(2, 5)] int someValue))
{
     var entity = new SomeClass();
     entity.Flag = flag;
     entity.SomeValue = someValue;
     var context = entity.GetContext();

     Assert.AreEqual(context.SomeValue, entity.SomeValue);
}

When I try to run test, it throws TargetParameterCountException. StackTrace:

at System.Reflection.RuntimeMethodInfo.InvokeArgumentsCheck(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at NUnit.Core.Reflect.InvokeMethod(MethodInfo method, Object fixture, Object[] args)
at NUnit.Core.TestMethod.RunTestMethod(TestResult testResult)
at NUnit.Core.TestMethod.RunTestCase(TestResult testResult)

What is wrong? I use Nunit 3.4.1and VS 2012. Simple tests work well.

Answer 1

Your code is fine and runs fine for me using the NUnit 3 Visual Studio Adapter. Based on the callstack, you are trying to run the code in an older NUnit 2 based adapter. It is either an older version of Resharper or an old version of the NUnit Visual Studio Extension from before it was updated to not run NUnit 3 tests.

Install the NUnit 3 Visual Studio adapter and give that a try. If you are using Resharper, you need to pay for an update.

Also, pro-tip, you don't need to include the values in the attribute for bool or enums, all values will be automatically injected. You also don't need the Test attribute.

Here is my simplified version of your example,

[Combinatorial]
public void SomeTest([Values] bool flag, [Values(2, 5)] int someValue)
{
    TestContext.WriteLine($"{flag} - ${someValue}");
}

And the results in the Visual Studio Adapter,