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1.10.0 • Public • Published

Grunt Mocha CLI

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Run Mocha server-side tests in Grunt.

Getting Started

If you haven't used Grunt before, be sure to check out the Getting Started guide, as it explains how to create a Gruntfile as well as install and use Grunt plugins. You can install this plugin with this command:

npm install grunt-mocha-cli --save-dev



All of the Mocha command line options are supported, plus some extras.

The list of test files to run can be specified using either the standard Grunt format or by using the files option. If neither is specified, the Mocha default will be used (test/*.js).

Warning: If you have a large number of test files, you should use the filesRaw option and not the standard Grunt format or the files option. Otherwise you risk hitting the operating system command line length limit.

Mocha Options

  • async-only (boolean) - force all tests to take a callback (async).
  • bail (boolean) - bail after first test failure.
  • check-leaks (boolean) - check for global variable leaks.
  • colors (boolean) - force enabling of colors.
  • compilers (array) - use the given module(s) to compile files.
  • debug-brk (boolean) - enable node's debugger breaking on the first line.
  • debug (boolean) - enable node's debugger, synonym for node --debug.
  • expose-gc (boolean) - expose gc extension, synonym for node --expose-gc.
  • gc-global (boolean) - always perform global GCs, synonym for node --gc-global.
  • globals (array) - allow the given comma-delimited global names.
  • grep (string) - only run tests matching pattern.
  • growl (boolean) - enable growl notification support.
  • harmony-collections (boolean) - enable harmony collections, synonym for node --harmony-collections.
  • harmony-generators (boolean) - enable harmony generators, synonym for node --harmony-generators.
  • harmony-proxies (boolean) - enable harmony proxies, synonym for node --harmony-proxies.
  • harmony (boolean) - enable all harmony features (except typeof), synonym for node --harmony.
  • inline-diffs (boolean) - display actual/expected differences inline within each string.
  • invert (boolean) - inverts grep matches.
  • ndebug (boolean) - use node's debugger, synonym for node debug.
  • no-colors (boolean) - force disabling of colors.
  • no-deprecation (boolean) - silence deprecation warnings.
  • no-exit (boolean) - require a clean shutdown of the event loop: mocha will not call process.exit().
  • no-timeouts (boolean) - disables timeouts, given implicitly with debug.
  • opts (string) - specify opts path.
  • prof (boolean) - log statistical profiling information, synonym for node --prof.
  • recursive (boolean) - include sub directories.
  • reporter (string) - specify the reporter to use.
  • require (array) - require the given modules.
  • slow (string) - "slow" test threshold in milliseconds [75].
  • sort (boolean) - sort test files.
  • throw-deprecation (boolean) - throw an exception anytime a deprecated function is used.
  • timeout (string) - set test-case timeout in milliseconds [2000].
  • trace-deprecation (boolean) - show stack traces on deprecations.
  • trace (boolean) - trace function calls.
  • ui (string) - specify user-interface (bdd|tdd|exports).


  • env (object) - hash of additional environment variables to pass to the Mocha process.
  • files (array) - globs of test files to run.
  • filesRaw (array) - globs of test files to run. These globs are passed directly to Mocha and aren't expanded by Grunt first.
  • force (boolean) - continue running Grunt tasks even if tests fail.
  • quiet (boolean) - disable printing of Mocha's output to the terminal.
  • save (string) - write the mocha output to a file.


Define test files using the standard Grunt format:

    mochacli: {
        options: {
            require: ['should'],
            reporter: 'nyan',
            bail: true
        all: ['test/*.js']
grunt.registerTask('test', ['mochacli']);

Define test files and basic options once, then customise options per target:

    mochacli: {
        options: {
            require: ['should'],
            files: 'test/*.js'
        spec: {
            options: {
                reporter: 'spec'
        nyan: {
            options: {
                reporter: 'nyan'
grunt.registerTask('test', ['mochacli:spec']);


In lieu of a formal style guide, take care to maintain the existing coding style. Add unit tests for any new or changed functionality. Lint and test your code using Grunt.


Grunt Mocha CLI is released under the MIT license.

Copyright © 2013 Roland Warmerdam.


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