feat: support mocha opts

README.md

@@ -111,6 +111,23 @@ module.exports = function(config) {
 };
 ```
 
+If you already have a configuration for Mocha in an opts file, you can use the `opts` option:
+
+```js
+module.exports = function(config) {
+  config.set({
+    ...
+    client: {
+      mocha: {
+        opts: 'test/mocha.opts' // You can set opts to equal true then plugin will load opts from default location 'test/mocha.opts'
+        ...
+      }
+      ...
+    }
+  });
+};
+```
+
 ## Internals
 
 On the end of each test `karma-mocha` passes to `karma` result object with fields:

lib/index.js

@@ -1,28 +1,82 @@
 var path = require('path')
+var extend = require('util')._extend
+var minimist = require('minimist')
 
 var createPattern = function (path) {
   return {pattern: path, included: true, served: true, watched: false}
 }
 
-var initMocha = function (files, mochaConfig) {
+var initMocha = function (files, config) {
   var mochaPath = path.dirname(require.resolve('mocha'))
   files.unshift(createPattern(path.join(__dirname, 'adapter.js')))
 
-  if (mochaConfig && mochaConfig.require && mochaConfig.require.map) {
+  config = config || {}
+  config.client = config.client || {}
+  var mochaConfig = config.client.mocha = getMochaOpts(config.client.mocha || {})
+
+  if (mochaConfig.require && mochaConfig.require.map) {
     mochaConfig.require.map(function (requirePath) {
       return files.unshift(createPattern(requirePath))
     })
   }
 
   files.unshift(createPattern(path.join(mochaPath, 'mocha.js')))
 
-  if (mochaConfig && mochaConfig.reporter) {
+  if (mochaConfig.reporter) {
     files.unshift(createPattern(path.join(mochaPath, 'mocha.css')))
   }
 }
 
-initMocha.$inject = ['config.files', 'config.client.mocha']
+initMocha.$inject = ['config.files', 'config']
 
 module.exports = {
   'framework:mocha': ['factory', initMocha]
 }
+
+function getMochaOpts (mochaConfig) {
+  var optsPath = typeof mochaConfig.opts === 'string' ? mochaConfig.opts : 'test/mocha.opts'
+
+  if (!mochaConfig.opts) {
+    return mochaConfig
+  }
+
+  delete mochaConfig.opts
+
+  var fs = require('fs')
+  if (!fs.existsSync(optsPath)) {
+    return mochaConfig
+  }
+
+  return extend(normalizeOpts(minimist(fs.readFileSync(optsPath, 'utf8')
+    .replace(/\\\s/g, '%20')
+    .split(/\s/)
+    .filter(Boolean)
+    .map(function (value) {
+      return value.replace(/%20/g, ' ')
+    }))), mochaConfig)
+
+  function normalizeOpts (opts) {
+    opts = [
+      'require',
+
+      'ui',
+      'reporter',
+      'globals',
+      'grep',
+      'timeout',
+      'slow',
+      'bail',
+      'ignoreLeaks'
+    ].reduce(function (result, optName) {
+      if (opts.hasOwnProperty(optName)) {
+        result[optName] = opts[optName]
+      }
+
+      return result
+    }, {})
+
+    opts.require = [].concat(opts.require || [])
+
+    return opts
+  }
+}

package.json

@@ -21,7 +21,9 @@
     "mocha"
   ],
   "author": "Vojta Jina <vojta.jina@gmail.com>",
-  "dependencies": {},
+  "dependencies": {
+    "minimist": "1.2.0"
+  },
   "devDependencies": {
     "chai": "^3.4.1",
     "eslint": "^2.0.0",
@@ -42,6 +44,7 @@
     "karma-sinon": "^1.0.3",
     "load-grunt-tasks": "^3.2.0",
     "mocha": "^3.0.0",
+    "mock-fs": "^3.12.1",
     "shared-karma-files": "git://github.com/karma-runner/shared-karma-files.git#82ae8d02",
     "sinon": "^1.17.2"
   },

test/lib/index.spec.js

@@ -1,3 +1,4 @@
+var mock = require('mock-fs')
 var expect = require('chai').expect
 var initMocha = require('../../lib')['framework:mocha'][1]
 
@@ -23,20 +24,104 @@ describe('framework:mocha', function () {
   it('should add required files', function () {
     var mochaConfig = {require: ['foo.js']}
 
-    initMocha(files, mochaConfig)
+    initMocha(files, createMochaConfig(mochaConfig))
 
     expect(files[1].pattern).to.contain('foo.js')
   })
 
   it('should add mocha.css if we define reporter in config', function () {
     var mochaConfig = {reporter: 'html'}
 
-    initMocha(files, mochaConfig)
+    initMocha(files, createMochaConfig(mochaConfig))
 
     expect(files[0].pattern).to.contain('mocha.css')
   })
+
+  describe('load mocha.opts as a configuration file', function () {
+    beforeEach(function () {
+      mock({
+        'test/mocha.opts': [
+          '--sort',
+
+          '--require should',
+          '--reporter dot',
+          '--ui bdd',
+          '--globals foo',
+          '--globals bar',
+          '--timeout 100',
+          '--slow 200',
+          '--grep zoo',
+          '--bail',
+          '--ignoreLeaks'
+        ].join('\n'),
+        'test/foo.opts': '--ui tdd'
+      })
+    })
+
+    afterEach(function () {
+      mock.restore()
+    })
+
+    it('should read mocha options from test/mocha.opts file by default', function () {
+      var config = createMochaConfig({opts: true})
+
+      initMocha(files, config)
+
+      expect(config.client.mocha.require).to.eql(['should'])
+      expect(config.client.mocha.globals).to.eql(['foo', 'bar'])
+      expect(config.client.mocha.reporter).to.equal('dot')
+      expect(config.client.mocha.ui).to.equal('bdd')
+    })
+
+    it('should set only supported options', function () {
+      var config = createMochaConfig({opts: true})
+
+      initMocha(files, config)
+
+      expect(config.client.mocha).to.eql({
+        require: ['should'],
+
+        ui: 'bdd',
+        reporter: 'dot',
+        globals: ['foo', 'bar'],
+        grep: 'zoo',
+
+        timeout: 100,
+        slow: 200,
+        bail: true,
+        ignoreLeaks: true
+      })
+    })
+
+    it('should rewrite options from mocha.opts by options from config', function () {
+      var config = createMochaConfig({opts: true, ui: 'tdd', globals: ['zoo']})
+
+      initMocha(files, config)
+
+      expect(config.client.mocha.require).to.eql(['should'])
+      expect(config.client.mocha.globals).to.eql(['zoo'])
+      expect(config.client.mocha.reporter).to.equal('dot')
+      expect(config.client.mocha.ui).to.equal('tdd')
+    })
+
+    it('should pass custom mocha.opts path', function () {
+      var config = createMochaConfig({opts: 'test/foo.opts'})
+
+      initMocha(files, config)
+
+      expect(config.client.mocha.ui).to.equal('tdd')
+    })
+  })
 })
 
 function createMockFiles () {
   return []
 }
+
+function createMochaConfig (mochaConfig) {
+  return {
+    client: {
+      mocha: mochaConfig
+    }
+  }
+}