Run Mocha tests

Keep in mind that this is just a thin wrapper around Mocha and your issue is most likely with Mocha.

npm install --save-dev gulp-mocha

import gulp from 'gulp';
import mocha from 'gulp-mocha';
export default () => (
	gulp.src('test.js', {read: false})
		// `gulp-mocha` needs file paths so you cannot have any plugins before it.
		.pipe(mocha({reporter: 'nyan'}))
);

Type: object

Options are passed directly to the mocha binary, so you can use any its command-line options in a camelCased form. Arrays and key/value objects are correctly converted to the comma separated list format Mocha expects. Listed below are some of the more commonly used options:

Type: string
Default: 'bdd'
Values: 'bdd' | 'tdd' | 'qunit' | 'exports'

The interface to use.

Type: string
Default: spec
Values: Reporters

The reporter that will be used.

This option can also be used to utilize third-party reporters. For example, if you npm install mocha-lcov-reporter you can then do use mocha-lcov-reporter as value.

Type: object
Example: {reportFilename: 'index.html'}

Reporter specific options.

Type: string[]

List of accepted global variable names, example ['YUI']. Accepts wildcards to match multiple global variables, e.g. ['gulp*'] or even ['*']. See Mocha globals option.

Type: number
Default: 2000

Test-case timeout in milliseconds.

Type: boolean
Default: false

Bail on the first test failure.

Type: boolean
Default: false

Check for global variable leaks.

Type: string

Only run tests matching the given pattern which is internally compiled to a RegExp.

Type: string[]

Require custom modules before tests are run.

Type: string
Example: js:babel-core/register

Specify a compiler.

If your test suite is not exiting it might be because you still have a lingering callback, most often caused by an open database connection. You should close this connection or do the following:

export default () => (
	gulp.src('test.js')
		.pipe(mocha())
		.once('error', err => {
			console.error(err);
			process.exit(1);
		})
		.once('end', () => {
			process.exit();
		})
);

Or you might just need to pass the exit option:

export const test = () => (
	gulp.src(['test/**/*.js'], {read: false})
		.pipe(mocha({reporter: 'list', exit: true}))
		.on('error', console.error)
);