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name: mojo-test-runner description: "Run Mojo tests using mojo test command. Use when executing tests or verifying test coverage." mcp_fallback: none category: mojo agent: test-engineer user-invocable: false

Mojo Test Runner Skill

Execute Mojo tests with filtering and reporting.

When to Use

• Running Mojo test suites
• Verifying implementation correctness
• TDD red-green-refactor cycle
• Checking test coverage before PR

Quick Reference

Copy# Run all tests
mojo test tests/

# Run specific file
mojo test tests/test_tensor.mojo

# Run with verbose output
mojo test -v tests/

# Run tests matching pattern
./scripts/run_tests.sh tensor

Workflow

1. Run tests - Execute mojo test or script
2. Review output - Check pass/fail summary
3. Fix failures - Address failing tests
4. Re-run tests - Verify all pass

Mojo-Specific Notes

• Test functions must start with test_
• Test files must match test_*.mojo or *_test.mojo
• Tests run independently - no shared state between tests
• Use raises keyword for exception testing

Error Handling

References

• .claude/shared/mojo-anti-patterns.md - Common test mistakes
• /notes/review/ - Testing strategy documentation