BaseTestBehaviorObserver .cs

public class BaseTestBehaviorObserver : ITestBehaviorObserver
{
    private readonly ITestExecutionSubject testExecutionSubject;

    public BaseTestBehaviorObserver(ITestExecutionSubject testExecutionSubject)
    {
        this.testExecutionSubject = testExecutionSubject;
        testExecutionSubject.Attach(this);
    }

    public virtual void PreTestInit(TestContext context, MemberInfo memberInfo)
    {
    }

    public virtual void PostTestInit(TestContext context, MemberInfo memberInfo)
    {
    }

    public virtual void PreTestCleanup(TestContext context, MemberInfo memberInfo)
    {
    }

    public virtual void PostTestCleanup(TestContext context, MemberInfo memberInfo)
    {
    }

    public virtual void TestInstantiated(MemberInfo memberInfo)
    {
    }
}