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##Add-ons

Assertion Libraries

should.js - BDD style shown throughout these docs
chai - expect(), assert() and should style assertions
expect.js - expect() style assertions
expectations - Jasmine-style expect()
unit.js - simple, fluent assertions
unexpected - extensible BDD assertion toolkit

Mocks, Stubs, & Spies

sinon.js - Test spies, stubs and mocks for JavaScript.
simple-mock - Super simple mocks, stubs, and spies with 1-step sandbox restore.
nock - HTTP mocking and expectations library.

Interfaces & Reporters

mocha-clean - Cleaner stack traces
mocha-matrix - concise matrix reporter for the browser
mocha-cakes - BDD acceptance tests, Cucumber Given/When/Then stories add-on for Mocha.
mocha.parallel - Run async mocha specs in parallel.
lcov-reporter -- lcov reporter
text-cov -- Text summary in console of code coverage
JSCovReporter In browser Javascript coverage reporter using CoverJS instrumented code.
qunit-mocha-ui - A Mocha interface that more closely replicates the QUnit API, including QUnit's assertions.
mocha-qunit-ui - Mocha interface that is API-compatible with QUnit
mocha-ui-tsexports - Mocha interface that enables tests written using TypeScript classes
xunit-file - A Mocha reporter similar to xunit, but writes to a file (excludes all console.log output that breaks the xml).
WebConsole-reporter - A Mocha reporter that displays reports in browser console. Works faster than html reporter and provides clickable stack traces.
mocha-slow-reporter - Outputs a profile-like tree of the tests/hooks to help you fix test-suite slowness.
mocha-unfunk-reporter - An alternate to the default Spec-style reporter for improved usability and added compatibility features for use in various low-tech scenarios. Does not use console cursor tricks or positional ANSI codes.
mocha-fivemat-reporter - Reporter format inspired by fivemat. Better signal vs noise ratio for larger test suites.
mocha-teamcity-reporter - Teamcity reporter for Mocha.
loca - Reporter in your browser's console.
mocha-retry - Allows you to retry a test if it fails using the bdd ui. Useful on unstable tests, like those that drive a browser.
child-reporter - Reporter, that create a child process with stdout to console. Useful for testing modules, that redirect stdout to /dev/null or logs
report-viewer - Cli for piping a unit test result directly into your browser. Combines the debug level of the console with the pretty output of a browser ui.

Headless testing

phantom-mochachino -- functional testing utility for running mocha tests with phantomjs
mocha-phantomjs -- run mocha tests with phantomjs
mocha-cloud -- run mocha tests on SauceLabs
mocha-cloud-grid-view -- terminal grid view for mocha-cloud
mochify -- run browserified mocha tests with phantomjs, selenium webdriver and saucelabs