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co-mocha.js
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co-mocha.js
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var co = require('co')
var isGenFn = require('is-generator').fn
/**
* Export `co-mocha`.
*/
module.exports = coMocha
/**
* Monkey patch the mocha instance with generator support.
*
* @param {Function} mocha
*/
function coMocha (mocha) {
// Avoid loading `co-mocha` twice.
if (!mocha || mocha._coMochaIsLoaded) {
return
}
var Runnable = mocha.Runnable
var run = Runnable.prototype.run
/**
* Override the Mocha function runner and enable generator support with co.
*
* @param {Function} fn
*/
Runnable.prototype.run = function (fn) {
var oldFn = this.fn
if (isGenFn(oldFn)) {
this.fn = co.wrap(oldFn)
// Replace `toString` to output the original function contents.
this.fn.toString = function () {
// https://github.com/mochajs/mocha/blob/7493bca76662318183e55294e906a4107433e20e/lib/utils.js#L251
return Function.prototype.toString.call(oldFn)
.replace(/^function *\* *\(.*\)\s*{/, 'function () {')
}
}
return run.call(this, fn)
}
mocha._coMochaIsLoaded = true
}
/**
* Find active node mocha instances.
*
* @return {Array}
*/
function findNodeJSMocha () {
var children = require.cache || {}
return Object.keys(children)
.filter(function (child) {
var val = children[child].exports
return typeof val === 'function' && val.name === 'Mocha'
})
.map(function (child) {
return children[child].exports
})
}
// Attempt to automatically monkey patch available mocha instances.
var modules = typeof window === 'undefined' ? findNodeJSMocha() : [window.Mocha]
modules.forEach(coMocha)