"With great power comes great responsibility". And Test Double Patterns gives you a great power. Your life is easier, tests lighter and faster.
But someday this power can turn against you.
Each day we are more comfortable with using Test Double Patters. We are creating assumptions. We are mocking services. We are ending with well covered code and tests... that tell us nothing.
That's why it's so important to recognize warning signs. To know the pitfalls that are waiting for us. To know what to do in these situations.