Jasmine
Behavior-driven development (BDD) testing framework for JavaScript with zero dependencies and no DOM requirement. Provides describe/it/expect syntax with a rich built-in matcher library and spy/mock system. Works in both Node.js and browsers without configuration. One of the oldest and most established JavaScript test frameworks.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Testing framework with no runtime dependencies. No network calls. Zero external dependencies in core package.
⚡ Reliability
Best When
You're working on an Angular project (default framework), maintaining legacy test suites, or need a zero-dependency browser-compatible test framework.
Avoid When
Starting a new project — Jest or Vitest offer better tooling, TypeScript support, and ecosystem integration for greenfield work.
Use Cases
- • Write BDD-style unit tests for JavaScript/TypeScript agent modules with describe/it/expect syntax
- • Test browser-compatible JavaScript code in both Node.js and browser environments with the same test files
- • Mock dependencies in agent unit tests using Jasmine's built-in spy system (spyOn, createSpy, createSpyObj)
- • Test Angular applications where Jasmine is the default framework (via Angular CLI and Karma)
- • Write self-contained tests with zero external dependencies for lightweight CI environments
Not For
- • Modern TypeScript-first projects — Jest or Vitest offer better TypeScript integration, snapshot testing, and faster parallel execution
- • Projects already using Jest — Jasmine's API is similar but not identical; migration friction is high
- • High-performance test suites with hundreds of test files — Jest's parallel worker model is faster at scale
Interface
Authentication
Local testing framework — no authentication required.
Pricing
MIT license. One of the foundational JavaScript testing frameworks, maintained by Pivotal Labs team.
Agent Metadata
Known Gotchas
- ⚠ Jasmine runs tests serially in a single thread — no parallel execution; large test suites are slower than Jest's parallel worker model
- ⚠ Async tests require returning a Promise or calling done() callback — forgetting done() or not returning a Promise silently passes tests without running assertions
- ⚠ Jasmine's spy system (spyOn) modifies objects in-place — must call jasmine.clock().uninstall() and restore spies in afterEach or tests leak state
- ⚠ No built-in code coverage — requires Istanbul/nyc integration separately; Jest includes coverage out of the box
- ⚠ jasmine.DEFAULT_TIMEOUT_INTERVAL is 5000ms — async tests that take longer silently fail; increase per-spec or globally for slow I/O operations
- ⚠ Jasmine 4.x/5.x introduced breaking changes to custom matchers — the matchersUtil API changed; verify compatibility when upgrading from Jasmine 3.x
Alternatives
Full Evaluation Report
Detailed scoring breakdown, competitive positioning, security analysis, and improvement recommendations for Jasmine.
Scores are editorial opinions as of 2026-03-06.