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11.7Decision Matrix: Which Tool When
| Scenario | Best Tool | Why |
|---|---|---|
| Writing 2-3 quick tests inline | Copilot | Fastest for individual test completion |
| Generating a 30-test suite from a spec | Claude Code | Largest context, can read spec files, self-heals |
| Iteratively building tests with visual review | Cursor | Best diff view, interactive chat, codebase-aware |
| CI/CD test generation automation | Claude Code | CLI-native, scriptable, can run in pipelines |
| Exploring new test patterns | Cursor | Chat mode for questions + code generation |
| Filling in parametrized test data | Copilot | Pattern continuation is excellent for data tables |
| Complex multi-service integration tests | Claude Code | Multi-file awareness, can read configs and schemas |