My Harness Used One Label for Three Different Failures

Developer Keniel Zepeda explores a common pitfall in error handling where a single catch-all label masks distinct failure modes. In his integration harness, three different issues—unreadable input arguments, a mismatch between actual and expected arguments, and a failure in the comparison logic itself—were all incorrectly categorized under the same 'EXEC_ARGUMENTS_MISMATCH' label. This ambiguity made debugging difficult, as it failed to distinguish between input errors and internal system failures. By refactoring the code to split parsing and comparison into separate try-catch blocks, Zepeda successfully introduced more granular error reporting. The article emphasizes the importance of precise error naming and warns against 'silent' filters that discard unrecognized error codes. Zepeda concludes by advising developers to audit their error handling to ensure that every failure label accurately reflects the specific cause, rather than leaving developers to infer the source of the problem.