mjackson/expect

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

2269 stars · 115 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

[email protected] is a minimal JavaScript assertion library for writing readable test assertions like expect(value).toEqual(3), with built-in spy support. Development was donated to Jest, so v21+ lives in facebook/jest and this repo only receives limited maintenance for pre-v21 versions.

Use cases

• write readable assertions in JavaScript unit tests
• replace verbose assert.equal calls with expect-style assertions
• create and inspect test spies without pulling in Sinon
• use a compact alternative to Chai in Node tests
• run assertions in the browser via a UMD script tag

When to choose

• you maintain a legacy codebase already using [email protected]
• you want a tiny, dependency-light assertion library with spy support
• you need browser-compatible assertions via UMD

When to avoid

• you are starting a new project - use Jest's expect or Chai instead
• you need actively maintained assertion features or bug fixes
• you want a full test runner rather than just assertions

Facets

library · maturity abandoned

testing e2e-testing testing developer-tools assertions test-assertions spies jest-donated umd nodejs javascript

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