Avoid test delays and speed up your development cycle by mocking callbacks

Mocking is one way to achieve isolation in tests. It is the practice of using a fake object in place of a collaborator object. In the simplest case, a mock will accept a method call, do nothing, and return a value (usually nil in Ruby). Mocks can also stub methods to return realistic values. They can provide static responses or use arguments to calculate a return value. It’s often as simple as specifying the expected method arguments and a response.