NewMockLogger returns a new logger mock.

MockAlertPublisher is not a real mock, it is a test stub that keeps the last alert.

MockExecutorCombinedOutputErr is a struct used for tetss where CombinedOutput returns an error, but Run and Output do not.

MockExecutorNoErr is a struct used for tests, where Run, Output, and CombinedOutput all return with no errors.

MockExecutorRunErr is a struct used for tests where Run returns an error, but Output and CombinedOutput do not.