xUnit3000 Error

Classes which cross AppDomain boundaries must derive directly or indirectly from LongLivedMarshalByRefObject

Cause

Classes which may cross AppDomain boundaries must derive from LongLivedMarshalByRefObject to correctly support both .NET Framework (with app domains) and .NET Core (without app domains).

Reason for rule

Classes that implement one of the cross-AppDomain interface types (from the Xunit.Abstractions namespace) must be able to be proxied across AppDomain boundaries, and must be able to survive for longer than the default 5 minutes.

How to fix violations

To fix a violation of this rule, use LongLivedMarshalByRefObject as the base class for your class. If your class lives on the runner side, then use Xunit.Sdk.LongLivedMarshalByRefObject; if your class lives on the execution side, use Xunit.LongLivedMarshalByRefObject.

Examples

Violates

using Xunit.Abstractions;

public class xUnit3000 : ITestCase
{
    // ...implementation of test case...
}

Does not violate

using Xunit;
using Xunit.Abstractions;

public class xUnit3000 : LongLivedMarshalByRefObject, ITestCase
{
    // ...implementation of test case...
}