Agent skill
assertion-best-practices
Use specific assertions (toBeNull, toContain, toHaveLength) over generic ones (toBe, toBeTruthy) Use when writing and organizing tests. Testing category skill.
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npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/other/other/assertion-best-practices
Metadata
Additional technical details for this skill
- category
- Testing
- priority
- medium
- is built in
- YES
- session guardian id
- builtin_assertion_best_practices
SKILL.md
Assertion Best Practices
Use specific assertions (toBeNull, toContain, toHaveLength) over generic ones (toBe, toBeTruthy). Test one concept per assertion group. Include custom failure messages when the default isn't clear. Avoid asserting implementation details—test observable behavior. Prefer deep equality for objects. Assert negative cases too (doesn't contain, not called).
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