Change Details

This: - Align all tests to use json format so the output check is simpler - Simplify the failure cases to check the caplog record - Drop dead code - Rename tests with a `test_cli_` prefix so it's simpler to run separately from the rest

This: - Aligns all tests to use `json` format output so the assertion check is simpler (no tampering with caplog record) - Simplify the caplog record assertion check in failure scenarios - Drop dead code - Rename tests with a `test_cli_` prefix so it's simpler to run them separately from the rest

This: - Aligns all tests to use `json` format output so the outputassertion check is simpler simpler (no tampering with caplog record) - Simplify the failure cases tocaplog record assertion check the caplog recordin failure scenarios - Drop dead code - Rename tests with a `test_cli_` prefix so it's simpler to run them separately from the rest