Go Table-Driven Tests

Table-driven tests are a powerful Go idiom — when used correctly. Most codebases either underuse them (10 copy-paste tests) or overuse them (complex branching logic in a 200-line struct). This skill covers the sweet spot.

Detailed reference material, loaded on demand:

• references/patterns.md — full worked examples: canonical tables, wantErr/wantErrIs, parallel tables, map-based tables, error-only tables, struct alignment for readability.
• references/refactoring.md — recognizing bloated tables and rewriting them as explicit subtests, with before/after examples.

Read a reference file only when the summary below is not enough for the task at hand.

1. When Table-Driven Tests Shine