MSTestExecutionProvider.cs

public class MSTestExecutionProvider : IExecutionProvider
{
    public event EventHandler<TestExecutionEventArgs> TestInstantiatedEvent;

    public event EventHandler<TestExecutionEventArgs> PreTestInitEvent;

    public event EventHandler<TestExecutionEventArgs> PostTestInitEvent;

    public event EventHandler<TestExecutionEventArgs> PreTestCleanupEvent;

    public event EventHandler<TestExecutionEventArgs> PostTestCleanupEvent;

    public void PreTestInit(TestContext context, MemberInfo memberInfo)
    {
        this.RaiseTestEvent(this.PreTestInitEvent, context, memberInfo);
    }

    public void PostTestInit(TestContext context, MemberInfo memberInfo)
    {
        this.RaiseTestEvent(this.PostTestInitEvent, context, memberInfo);
    }

    public void PreTestCleanup(TestContext context, MemberInfo memberInfo)
    {
        this.RaiseTestEvent(this.PreTestCleanupEvent, context, memberInfo);
    }

    public void PostTestCleanup(TestContext context, MemberInfo memberInfo)
    {
        this.RaiseTestEvent(this.PostTestCleanupEvent, context, memberInfo);
    }

    public void TestInstantiated(MemberInfo memberInfo)
    {
        this.RaiseTestEvent(this.TestInstantiatedEvent, null, memberInfo);
    }

    private void RaiseTestEvent(EventHandler<TestExecutionEventArgs> eventHandler, TestContext testContext, MemberInfo memberInfo)
    {
        if (eventHandler != null)
        {
            eventHandler(this, new TestExecutionEventArgs(testContext, memberInfo));
        }
    }
}