The point is to test against a model of the dependency, not just the expected behavour of the code under test. If you just write a mock that exactly corresponds to the test that you're running, you're not testing the interface with the underlying system, you're just running the (probably already perfectly understandable) unit through a rote set of steps, and that's both harder to maintain and less useful than testing against a model of the underlying system.

(And IMO this should only be done for heavyweight or difficult to precisely control components of the system where necessary to improve test runtime or expand the range of testable conditions. Always prefer testing as close to the real system as reasonably practical)