v2 v3 AOT   Error

xUnit1063

"Test class cannot be an open generic type"

Cause

A violation of this rule occurs when a non-abstract test class is an open generic type.

Reason for rule

Test classes cannot be open generic types, since the system does not know how to resolve the open type(s).

How to fix violations

To fix a violation of this rule, one of two situations typically applies:

• If the test class is not meant to be a base class, then remove or close the generic type.
• If the test class is meant to be a base class, with test methods that operate on the generic type, then that class should be marked as abstract so the system will not try to create it directly.

Examples

Violates

using Xunit;

public class OpenGenericTestClass<T>
{
    [Fact]
    public void TestMethod()
    { /* test code which uses type T */ }
}

public class MyTypeTestClass : OpenGenericTestClass<MyType>
{ }

Does not violate

using Xunit;

public abstract class OpenGenericTestClass<T>
{
    [Fact]
    public void TestMethod()
    { /* test code which uses type T */ }
}

public class MyTypeTestClass : OpenGenericTestClass<MyType>
{ }