A good unit test should be: Idempotent: It’s every engineer favorite word :) Meaning it can be run over and over and is always green. Independent/Atomic: Meaning it does not dependent on any other tests to run before and can be run at any order or randomly within a test suite
It is always better to follow such rules:
- use real code for system's under test dependencies
- if not possible, replace it with test double (like in-memory database)
- if not possible, replace it with mock object
- never test behaviour (method X was invoked), test state or returned result
What are some example unit test names? I am not clearly understanding the name format but examples would definitely help