We usually call them mocks. However, there are more patterns and it is really good to know them all. Why? Because it will make your tests simpler and more readable. Using Test Double Pattern in the right place helps you to express precise intention and behaviour of the objects.
During the talk, I will explain the difference between those patterns. I will also show you how they can increase the quality of your tests. And, finally, I will show you what happens when we abuse the usage of Test Doubles.