feat(config): default config can be karma.conf.js or karma.conf.coffee

Before Karma would always set the config to `./karma.conf.js` (if not specified
otherwise). Now, it checks for `karma.conf.js` and `karma.conf.coffee`
and set the config file path ONLY if the file actually exists.

lib/cli.js

@@ -2,9 +2,9 @@ var path = require('path');
 var optimist = require('optimist');
 var helper = require('./helper');
 var constant = require('./constants');
+var fs = require('fs');
 
-
-var processArgs = function(argv, options) {
+var processArgs = function(argv, options, fs, path) {
 
   if (argv.help) {
     console.log(optimist.help());
@@ -67,7 +67,18 @@ var processArgs = function(argv, options) {
     options.refresh = options.refresh === 'true';
   }
 
-  options.configFile = path.resolve(argv._.shift() || 'karma.conf.js');
+  var configFile = argv._.shift();
+
+  if (!configFile) {
+    // default config file (if exists)
+    if (fs.existsSync('./karma.conf.js')) {
+      configFile = './karma.conf.js';
+    } else if (fs.existsSync('./karma.conf.coffee')) {
+      configFile = './karma.conf.coffee';
+    }
+  }
+
+  options.configFile = configFile ? path.resolve(configFile) : null;
 
   return options;
 };
@@ -194,7 +205,7 @@ exports.process = function() {
     process.exit(1);
   }
 
-  return processArgs(argv, options);
+  return processArgs(argv, options, fs, path);
 };
 
 // just for testing

test/unit/cli.spec.coffee

@@ -4,13 +4,31 @@
 describe 'cli', ->
   cli = require '../../lib/cli'
   optimist = require 'optimist'
+  path = require 'path'
   constant = require '../../lib/constants'
-  CWD = process.cwd()
   path = require 'path'
+  mocks = require 'mocks'
+
+  fsMock = mocks.fs.create
+    cwd:
+      'karma.conf.js': true
+    cwd2:
+      'karma.conf.coffee': true
+
+  currentCwd = null
+
+  pathMock =
+    resolve: (p) -> path.resolve currentCwd, p
+
+  setCWD = (cwd) ->
+    currentCwd = cwd
+    fsMock._setCWD cwd
 
   processArgs = (args, opts) ->
     argv = optimist.parse(args)
-    cli.processArgs argv, opts || {}
+    cli.processArgs argv, opts || {}, fsMock, pathMock
+
+  beforeEach -> setCWD '/'
 
   describe 'processArgs', ->
 
@@ -23,13 +41,28 @@ describe 'cli', ->
 
 
     it 'should parse options without configFile and set default', ->
+      setCWD '/cwd'
       options = processArgs ['--auto-watch', '--auto-watch-interval', '10']
 
-      expect(options.configFile).to.equal path.join(CWD, 'karma.conf.js')
+      expect(options.configFile).to.equal '/cwd/karma.conf.js'
       expect(options.autoWatch).to.equal  true
       expect(options.autoWatchInterval).to.equal 10
 
 
+    it 'should set default karma.conf.coffee config file if exists', ->
+      setCWD '/cwd2'
+      options = processArgs ['--port', '10']
+
+      expect(options.configFile).to.equal '/cwd2/karma.conf.coffee'
+
+
+    it 'should not set default config if neither exists', ->
+      setCWD '/'
+      options = processArgs []
+
+      expect(options.configFile).to.equal null
+
+
     it 'should parse auto-watch, colors, singleRun to boolean', ->
       options = processArgs ['--auto-watch', 'false', '--colors', 'false', '--single-run', 'false']
 
@@ -61,8 +94,9 @@ describe 'cli', ->
 
 
     it 'should resolve configFile to absolute path', ->
+      setCWD '/cwd'
       options = processArgs ['some/config.js']
-      expect(options.configFile).to.equal path.join(CWD, '/some/config.js')
+      expect(options.configFile).to.equal '/cwd/some/config.js'
 
 
     it 'should parse report-slower-than to a number', ->