GivenWhen base class for tests

gistfile1.cs

abstract class Given
    {
        protected static When Given_(Action action)
        {
            action();
            return new When();
        }

        protected class When
        {
            public When And_(Action action)
            {
                action();
                return this;
            }

            public And When_(Action action)
            {
                action();
                return new And();
            }
        }

        protected class And
        {
            public And And_(Action action)
            {
                action();
                return this;
            } 
        }
    }