Yadda

Spec sheet

Purpose

Yadda is a JavaScript BDD library that maps ordinary-language steps to executable code.Read 8 Oct 2026 · github.com

Intended users

Yadda is aimed at JavaScript teams who want BDD step mapping while keeping their existing test runner.Read 8 Oct 2026 · github.com

Integrations

Yadda provides plugins for Node.js node:test, Mocha and Jasmine.Read 8 Oct 2026 · github.com

License

The repository is licensed under the ISC License.Read 8 Oct 2026 · github.com

Additional browser tooling

Examples include Puppeteer and Playwright setups, while Yadda itself runs in Node.js.Read 8 Oct 2026 · github.com

Dependencies

The project describes Yadda as having zero dependencies.Read 8 Oct 2026 · github.com

Dictionaries

Dictionaries provide reusable terms and can convert or source step parameters, including values from remote systems.Read 8 Oct 2026 · github.com

Feature files

Specifications can be written as GitHub-flavoured Markdown feature files.Read 8 Oct 2026 · github.com

Language support

Localisation is built in for multiple languages.Read 8 Oct 2026 · github.com

Languages

Yadda supports localisation for many languages, and its steps do not have to follow Given/When/Then wording.Read 8 Oct 2026 · github.com

Removed integrations

Yadda 3.0 removed Bower, Component, Karma and PhantomJS support, along with nightwatch, qunit and nodeunit examples.Read 8 Oct 2026 · github.com

Runtime requirement

Yadda 3.0 requires Node.js 20 or later and is Node-only; in-browser support was removed.Read 8 Oct 2026 · github.com

Step handling

Step functions can be synchronous, callback-based asynchronous, or promise-based.Read 8 Oct 2026 · github.com

Step libraries

Step libraries can be selected dynamically per scenario, allowing the same phrase to have different meanings in different contexts.Read 8 Oct 2026 · github.com

Test runner role

Yadda is not a test runner or test framework; it maps lines of text to function calls and plugs into an existing runner.Read 8 Oct 2026 · github.com

Test runners

It integrates with node:test, Mocha, and Jasmine, and does not provide its own test runner.Read 8 Oct 2026 · github.com

Where Specifiction places it

• BDD Testing Tools#28 of 306.2