diff --git a/Gruntfile.coffee b/Gruntfile.coffee
index d25dfb8b6..3c99570d8 100644
--- a/Gruntfile.coffee
+++ b/Gruntfile.coffee
@@ -30,7 +30,7 @@ module.exports = (grunt) ->
       unit: 'simplemocha:unit'
       tasks: 'simplemocha:tasks'
       client: 'test/client/karma.conf.js'
-      e2e: 'test/e2e/*/karma.conf.js'
+      e2e: ['test/e2e/*/karma.conf.js', 'test/e2e/*/karma.conf.coffee']
 
 
     simplemocha:
diff --git a/config.template b/config.template
index c591e9034..0156988b9 100644
--- a/config.template
+++ b/config.template
@@ -1,74 +1,78 @@
 // Karma configuration
 // Generated on %DATE%
 
+module.exports = function(karma) {
+  karma.configure({
 
-// base path, that will be used to resolve files and exclude
-basePath = '%BASE_PATH%';
+    // base path, that will be used to resolve files and exclude
+    basePath: '%BASE_PATH%',
 
 
-// frameworks to use
-frameworks = [%FRAMEWORKS%];
+    // frameworks to use
+    frameworks: [%FRAMEWORKS%],
 
 
-// list of files / patterns to load in the browser
-files = [
-  %FILES%
-];
+    // list of files / patterns to load in the browser
+    files: [
+      %FILES%
+    ],
 
 
-// list of files to exclude
-exclude = [
-  %EXCLUDE%
-];
+    // list of files to exclude
+    exclude: [
+      %EXCLUDE%
+    ],
 
 
-// test results reporter to use
-// possible values: 'dots', 'progress', 'junit', 'growl', 'coverage'
-reporters = ['progress'];
+    // test results reporter to use
+    // possible values: 'dots', 'progress', 'junit', 'growl', 'coverage'
+    reporters: ['progress'],
 
 
-// web server port
-port = 9876;
+    // web server port
+    port: 9876,
 
 
-// cli runner port
-runnerPort = 9100;
+    // cli runner port
+    runnerPort: 9100,
 
 
-// enable / disable colors in the output (reporters and logs)
-colors = true;
+    // enable / disable colors in the output (reporters and logs)
+    colors: true,
 
 
-// level of logging
-// possible values: LOG_DISABLE || LOG_ERROR || LOG_WARN || LOG_INFO || LOG_DEBUG
-logLevel = LOG_INFO;
+    // level of logging
+    // possible values: karma.LOG_DISABLE || karma.LOG_ERROR || karma.LOG_WARN || karma.LOG_INFO || karma.LOG_DEBUG
+    logLevel: karma.LOG_INFO,
 
 
-// enable / disable watching file and executing tests whenever any file changes
-autoWatch = %AUTO_WATCH%;
+    // enable / disable watching file and executing tests whenever any file changes
+    autoWatch: %AUTO_WATCH%,
 
 
-// Start these browsers, currently available:
-// - Chrome
-// - ChromeCanary
-// - Firefox
-// - Opera
-// - Safari (only Mac)
-// - PhantomJS
-// - IE (only Windows)
-browsers = [%BROWSERS%];
+    // Start these browsers, currently available:
+    // - Chrome
+    // - ChromeCanary
+    // - Firefox
+    // - Opera
+    // - Safari (only Mac)
+    // - PhantomJS
+    // - IE (only Windows)
+    browsers: [%BROWSERS%],
 
 
-// If browser does not capture in given timeout [ms], kill it
-captureTimeout = 60000;
+    // If browser does not capture in given timeout [ms], kill it
+    captureTimeout: 60000,
 
 
-// Continuous Integration mode
-// if true, it capture browsers, run tests and exit
-singleRun = false;
+    // Continuous Integration mode
+    // if true, it capture browsers, run tests and exit
+    singleRun: false,
 
 
-// plugins to load
-plugins = [
-  %PLUGINS%
-];
+    // plugins to load
+    plugins: [
+      %PLUGINS%
+    ],
+  });
+};
diff --git a/lib/config.js b/lib/config.js
index 58821c8a6..f73937b52 100644
--- a/lib/config.js
+++ b/lib/config.js
@@ -1,12 +1,13 @@
-var fs = require('fs');
 var path = require('path');
-var vm = require('vm');
-var coffee = require('coffee-script');
 
 var log = require('./logger').create('config');
 var helper = require('./helper');
 var constant = require('./constants');
 
+// Coffee is required here to enable config files written in coffee-script.
+// It's not directly used in this file.
+require('coffee-script');
+
 
 var Pattern = function(pattern, served, included, watched) {
   this.pattern = pattern;
@@ -39,8 +40,7 @@ var createPatternObject = function(pattern) {
   return new Pattern(null, false, false, false);
 };
 
-
-var normalizeConfig = function(config) {
+var normalizeConfig = function(config, configFilePath) {
 
   var basePathResolve = function(relativePath) {
     if (helper.isUrlAbsolute(relativePath)) {
@@ -61,6 +61,16 @@ var normalizeConfig = function(config) {
     };
   };
 
+  if (helper.isString(configFilePath)) {
+    // resolve basePath
+    config.basePath = path.resolve(path.dirname(configFilePath), config.basePath);
+
+    // always ignore the config file itself
+    config.exclude.push(configFilePath);
+  } else {
+    config.basePath = path.resolve(config.basePath || '.');
+  }
+
   config.files = config.files.map(createPatternObject).map(createPatternMapper(basePathResolve));
   config.exclude = config.exclude.map(basePathResolve);
   config.junitReporter.outputFile = basePathResolve(config.junitReporter.outputFile);
@@ -121,85 +131,64 @@ var normalizeConfig = function(config) {
   return config;
 };
 
-
-var readConfigFile = function(filepath) {
-  var configEnv = {
-    // constants
-    LOG_DISABLE: constant.LOG_DISABLE,
-    LOG_ERROR:   constant.LOG_ERROR,
-    LOG_WARN:    constant.LOG_WARN,
-    LOG_INFO:    constant.LOG_INFO,
-    LOG_DEBUG:   constant.LOG_DEBUG,
-    // access to globals
-    console: console,
-    require: require,
-    process: process,
-    __filename: filepath,
-    __dirname: path.dirname(filepath)
-  };
-
+var KarmaDsl = function(config) {
+  this.LOG_DISABLE = constant.LOG_DISABLE;
+  this.LOG_ERROR = constant.LOG_ERROR;
+  this.LOG_WARN = constant.LOG_WARN;
+  this.LOG_INFO = constant.LOG_INFO;
+  this.LOG_DEBUG = constant.LOG_DEBUG;
 
   // TODO(vojta): remove
   var CONST_ERR = '%s is not supported anymore.\n\tPlease use `frameworks = ["%s"];` instead.';
   ['JASMINE', 'MOCHA', 'QUNIT'].forEach(function(framework) {
     [framework, framework + '_ADAPTER'].forEach(function(name) {
-      Object.defineProperty(configEnv, name, {get: function() {
+      Object.defineProperty(global, name, {get: function() {
         log.warn(CONST_ERR, name, framework.toLowerCase());
       }});
     });
   });
 
   ['REQUIRE', 'REQUIRE_ADAPTER'].forEach(function(name) {
-    Object.defineProperty(configEnv, name, {get: function() {
+    Object.defineProperty(global, name, {get: function() {
       log.warn(CONST_ERR, name, 'requirejs');
     }});
   });
 
   ['ANGULAR_SCENARIO', 'ANGULAR_SCENARIO_ADAPTER'].forEach(function(name) {
-    Object.defineProperty(configEnv, name, {get: function() {
+    Object.defineProperty(global, name, {get: function() {
       log.warn(CONST_ERR, name, 'requirejs');
     }});
   });
 
-  var configSrc;
-  try {
-    configSrc = fs.readFileSync(filepath);
-  } catch(e) {
-    if (e.code === 'ENOENT' || e.code === 'EISDIR') {
-      log.error('Config file does not exist!');
-    } else {
-      log.error('Unexpected error opening config file!\n', e);
-    }
-
-    process.exit(1);
-  }
+  this.configure = function(newConfig) {
+    Object.keys(newConfig).forEach(function(key) {
+      config[key] = newConfig[key];
+    });
+  };
+};
 
-  try {
-    // if the configuration file is coffeescript compile it
-    if (path.extname(filepath) === '.coffee') {
-      configSrc = coffee.compile(configSrc.toString(), {bare: true});
+var parseConfig = function(configFilePath, cliOptions) {
+  var configModule;
+  if (configFilePath) {
+    try {
+      configModule = require(configFilePath);
+    } catch(e) {
+      if (e.code === 'MODULE_NOT_FOUND') {
+        log.error('Config file does not exist!');
+      } else {
+        log.error('Invalid config file!\n', e);
+      }
+      return process.exit(1);
     }
-
-    vm.runInNewContext(configSrc, configEnv);
-  } catch(e) {
-    if (e.name === 'SyntaxError') {
-      log.error('Syntax error in config file!\n' + e.message);
-    } else {
-      log.error('Invalid config file!\n', e);
+    if (!helper.isFunction(configModule)) {
+      log.error('Config file must export a function!');
+      return process.exit(1);
     }
-
-    process.exit(1);
+  } else {
+    // if no config file path is passed, we define a dummy config module.
+    configModule = function() {};
   }
 
-  return configEnv;
-};
-
-
-var parseConfig = function(configFilePath, cliOptions) {
-
-  var configFromFile = helper.isString(configFilePath) ? readConfigFile(configFilePath) : {};
-
-  // default config
   var config = {
     frameworks: [],
     port: constant.DEFAULT_PORT,
@@ -237,31 +226,20 @@ var parseConfig = function(configFilePath, cliOptions) {
       'karma-coffee-preprocessor'
     ]
   };
+  var dsl = new KarmaDsl(config);
+  try {
+    configModule(dsl);
+  } catch(e) {
+    log.error('Error in config file!\n', e);
+    return process.exit(1);
+  }
 
   // merge the config from config file and cliOptions (precendense)
-  Object.getOwnPropertyNames(config).forEach(function(key) {
-    if (cliOptions.hasOwnProperty(key)) {
-      config[key] = cliOptions[key];
-    } else if (configFromFile.hasOwnProperty(key)) {
-      config[key] = configFromFile[key];
-    }
-  });
-
-  if (helper.isString(configFilePath)) {
-    // resolve basePath
-    config.basePath = path.resolve(path.dirname(configFilePath), config.basePath);
+  dsl.configure(cliOptions);
 
-    // always ignore the config file itself
-    config.exclude.push(configFilePath);
-  }
-  else {
-    config.basePath = path.resolve(config.basePath);
-  }
-
-  return normalizeConfig(config);
+  return normalizeConfig(config, configFilePath);
 };
 
-
 // PUBLIC API
 exports.parseConfig = parseConfig;
 exports.Pattern = Pattern;
diff --git a/test/client/karma.conf.js b/test/client/karma.conf.js
index 409069a7a..a71411151 100644
--- a/test/client/karma.conf.js
+++ b/test/client/karma.conf.js
@@ -1,88 +1,84 @@
-// Sample Karma configuration file, that contain pretty much all the available options
-// It's used for running client tests on Travis (http://travis-ci.org/#!/karma-runner/karma)
-// Most of the options can be overriden by cli arguments (see karma --help)
-//
-// For all available config options and default values, see:
-// https://github.com/karma-runner/karma/blob/stable/lib/config.js#L54
-
-
-// base path, that will be used to resolve files and exclude
-basePath = '../..';
-
-frameworks = ['jasmine'];
-
-// list of files / patterns to load in the browser
-files = [
-  'test/client/mocks.js',
-  'static/karma.src.js',
-  'test/client/*.spec.js'
-];
-
-// list of files to exclude
-exclude = [];
-
-// use dots reporter, as travis terminal does not support escaping sequences
-// possible values: 'dots', 'progress', 'junit', 'teamcity'
-// CLI --reporters progress
-reporters = ['progress', 'junit'];
-
-junitReporter = {
-  // will be resolved to basePath (in the same way as files/exclude patterns)
-  outputFile: 'test-results.xml'
+module.exports = function(karma) {
+  karma.configure({
+    // base path, that will be used to resolve files and exclude
+    basePath: '../..',
+
+    frameworks: ['jasmine'],
+
+    // list of files / patterns to load in the browser
+    files: [
+      'test/client/mocks.js',
+      'static/karma.src.js',
+      'test/client/*.spec.js'
+    ],
+
+    // list of files to exclude
+    exclude: [],
+
+    // use dolts reporter, as travis terminal does not support escaping sequences
+    // possible values: 'dots', 'progress', 'junit', 'teamcity'
+    // CLI --reporters progress
+    reporters: ['progress', 'junit'],
+
+    junitReporter: {
+      // will be resolved to basePath (in the same way as files/exclude patterns)
+      outputFile: 'test-results.xml'
+    },
+
+    // web server port
+    // CLI --port 9876
+    port: 9876,
+
+    // cli runner port
+    // CLI --runner-port 9100
+    runnerPort: 9100,
+
+    // enable / disable colors in the output (reporters and logs)
+    // CLI --colors --no-colors
+    colors: true,
+
+    // level of logging
+    // possible values: karma.LOG_DISABLE || karma.LOG_ERROR || karma.LOG_WARN || karma.LOG_INFO || karma.LOG_DEBUG
+    // CLI --log-level debug
+    logLevel: karma.LOG_INFO,
+
+    // enable / disable watching file and executing tests whenever any file changes
+    // CLI --auto-watch --no-auto-watch
+    autoWatch: true,
+
+    // Start these browsers, currently available:
+    // - Chrome
+    // - ChromeCanary
+    // - Firefox
+    // - Opera
+    // - Safari (only Mac)
+    // - PhantomJS
+    // - IE (only Windows)
+    // CLI --browsers Chrome,Firefox,Safari
+    browsers: [],
+
+    // If browser does not capture in given timeout [ms], kill it
+    // CLI --capture-timeout 5000
+    captureTimeout: 5000,
+
+    // Auto run tests on start (when browsers are captured) and exit
+    // CLI --single-run --no-single-run
+    singleRun: false,
+
+    // report which specs are slower than 500ms
+    // CLI --report-slower-than 500
+    reportSlowerThan: 500,
+
+    // compile coffee scripts
+    preprocessors: {
+      '**/*.coffee': 'coffee'
+    },
+
+    plugins: [
+      'karma-jasmine',
+      'karma-chrome-launcher',
+      'karma-firefox-launcher',
+      'karma-junit-reporter'
+    ]
+  });
 };
-
-// web server port
-// CLI --port 9876
-port = 9876;
-
-// cli runner port
-// CLI --runner-port 9100
-runnerPort = 9100;
-
-// enable / disable colors in the output (reporters and logs)
-// CLI --colors --no-colors
-colors = true;
-
-// level of logging
-// possible values: LOG_DISABLE || LOG_ERROR || LOG_WARN || LOG_INFO || LOG_DEBUG
-// CLI --log-level debug
-logLevel = LOG_INFO;
-
-// enable / disable watching file and executing tests whenever any file changes
-// CLI --auto-watch --no-auto-watch
-autoWatch = true;
-
-// Start these browsers, currently available:
-// - Chrome
-// - ChromeCanary
-// - Firefox
-// - Opera
-// - Safari (only Mac)
-// - PhantomJS
-// - IE (only Windows)
-// CLI --browsers Chrome,Firefox,Safari
-browsers = [];
-
-// If browser does not capture in given timeout [ms], kill it
-// CLI --capture-timeout 5000
-captureTimeout = 5000;
-
-// Auto run tests on start (when browsers are captured) and exit
-// CLI --single-run --no-single-run
-singleRun = false;
-
-// report which specs are slower than 500ms
-// CLI --report-slower-than 500
-reportSlowerThan = 500;
-
-// compile coffee scripts
-preprocessors = {
-  '**/*.coffee': 'coffee'
-};
-
-plugins = [
-  'karma-jasmine',
-  'karma-chrome-launcher',
-  'karma-firefox-launcher',
-  'karma-junit-reporter'
-]
diff --git a/test/e2e/angular-scenario/karma.conf.js b/test/e2e/angular-scenario/karma.conf.js
index b903b1f1e..299699102 100644
--- a/test/e2e/angular-scenario/karma.conf.js
+++ b/test/e2e/angular-scenario/karma.conf.js
@@ -1,24 +1,27 @@
-frameworks = ['ng-scenario'];
+module.exports = function(karma) {
+  karma.configure({
+    frameworks: ['ng-scenario'],
 
-files = [
-  'e2eSpec.js'
-];
+    files: [
+      'e2eSpec.js'
+    ],
 
-urlRoot = '/__karma/';
+    urlRoot: '/__karma/',
 
-autoWatch = true;
+    autoWatch: true,
 
-proxies = {
-  '/': 'http://localhost:8000/test/e2e/angular-scenario/'
-};
-
-browsers = ['Chrome'];
+    proxies: {
+      '/': 'http://localhost:8000/test/e2e/angular-scenario/'
+    },
 
-reporters = ['dots'];
+    browsers: ['Chrome'],
 
-plugins = [
-  'karma-ng-scenario',
-  'karma-chrome-launcher',
-  'karma-firefox-launcher'
-];
+    reporters: ['dots'],
 
+    plugins: [
+      'karma-ng-scenario',
+      'karma-chrome-launcher',
+      'karma-firefox-launcher'
+    ]
+  });
+};
diff --git a/test/e2e/basic/karma.conf.js b/test/e2e/basic/karma.conf.js
index 33bbb698d..d7216fbb5 100644
--- a/test/e2e/basic/karma.conf.js
+++ b/test/e2e/basic/karma.conf.js
@@ -1,17 +1,21 @@
-frameworks = ['jasmine'];
+module.exports = function(karma) {
+  karma.configure({
+    frameworks: ['jasmine'],
 
-files = [
-  '*.js'
-];
+    files: [
+      '*.js'
+    ],
 
-autoWatch = true;
+    autoWatch: true,
 
-browsers = ['Chrome'];
+    browsers: ['Chrome'],
 
-reporters = ['dots'];
+    reporters: ['dots'],
 
-plugins = [
-  'karma-jasmine',
-  'karma-chrome-launcher',
-  'karma-firefox-launcher'
-];
+    plugins: [
+      'karma-jasmine',
+      'karma-chrome-launcher',
+      'karma-firefox-launcher'
+    ],
+  });
+};
diff --git a/test/e2e/coffee-config/basic.js b/test/e2e/coffee-config/basic.js
new file mode 100644
index 000000000..a4f319266
--- /dev/null
+++ b/test/e2e/coffee-config/basic.js
@@ -0,0 +1,5 @@
+describe('basic', function() {
+  it('should pass', function() {
+    expect(true).toBe(true);
+  });
+});
diff --git a/test/e2e/coffee-config/basic2.coffee b/test/e2e/coffee-config/basic2.coffee
new file mode 100644
index 000000000..4b37f2b9a
--- /dev/null
+++ b/test/e2e/coffee-config/basic2.coffee
@@ -0,0 +1,4 @@
+describe 'basic', ->
+
+  it 'should pass', ->
+    expect(true).toBe true
diff --git a/test/e2e/coffee-config/karma.conf.coffee b/test/e2e/coffee-config/karma.conf.coffee
new file mode 100644
index 000000000..4a27d35ed
--- /dev/null
+++ b/test/e2e/coffee-config/karma.conf.coffee
@@ -0,0 +1,26 @@
+module.exports = (karma) ->
+  karma.configure {
+    frameworks: ['jasmine'],
+
+    files: [
+      '*.js',
+      '*.coffee'
+    ],
+
+    autoWatch: true,
+
+    browsers: ['Chrome'],
+
+    reporters: ['dots'],
+
+    preprocessors: {
+      '**/*.coffee': 'coffee'
+    },
+
+    plugins: [
+      'karma-jasmine',
+      'karma-coffee-preprocessor',
+      'karma-chrome-launcher',
+      'karma-firefox-launcher'
+    ],
+  }
diff --git a/test/e2e/coffee/karma.conf.js b/test/e2e/coffee/karma.conf.js
index 3fa7b21ab..b1ac1fb74 100644
--- a/test/e2e/coffee/karma.conf.js
+++ b/test/e2e/coffee/karma.conf.js
@@ -1,22 +1,26 @@
-frameworks = ['jasmine'];
+module.exports = function(karma) {
+  karma.configure({
+    frameworks: ['jasmine'],
 
-files = [
-  '*.coffee'
-];
+    files: [
+      '*.coffee'
+    ],
 
-autoWatch = true;
+    autoWatch: true,
 
-browsers = ['Chrome'];
+    browsers: ['Chrome'],
 
-preprocessors = {
-  '**/*.coffee': 'coffee'
-};
+    preprocessors: {
+      '**/*.coffee': 'coffee'
+    },
 
-reporters = ['dots'];
+    reporters: ['dots'],
 
-plugins = [
-  'karma-jasmine',
-  'karma-coffee-preprocessor',
-  'karma-chrome-launcher',
-  'karma-firefox-launcher'
-];
+    plugins: [
+      'karma-jasmine',
+      'karma-coffee-preprocessor',
+      'karma-chrome-launcher',
+      'karma-firefox-launcher'
+    ],
+  });
+};
diff --git a/test/e2e/coverage/karma.conf.js b/test/e2e/coverage/karma.conf.js
index 928aa2a03..2df95b6b8 100644
--- a/test/e2e/coverage/karma.conf.js
+++ b/test/e2e/coverage/karma.conf.js
@@ -1,36 +1,40 @@
-frameworks = ['jasmine'];
+module.exports = function(karma) {
+  karma.configure({
+    frameworks: ['jasmine'],
 
-files = [
-  'lib/*.js',
-  'test/*.js'
-];
+    files: [
+      'lib/*.js',
+      'test/*.js'
+    ],
 
-autoWatch = true;
+    autoWatch: true,
 
-browsers = ['Chrome']
+    browsers: ['Chrome'],
 
-reporters = ['progress', 'coverage'];
+    reporters: ['progress', 'coverage'],
 
-preprocessors = {
-  'lib/*.js': 'coverage'
-};
+    preprocessors: {
+      'lib/*.js': 'coverage'
+    },
 
-//Code Coverage options. report type available:
-//- html (default)
-//- lcov (lcov and html)
-//- lcovonly
-//- text (standard output)
-//- text-summary (standard output)
-//- cobertura (xml format supported by Jenkins)
-coverageReporter = {
-    // cf. http://gotwarlost.github.io/istanbul/public/apidocs/
-    type : 'html',
-    dir : 'coverage/'
-};
+    //Code Coverage options. report type available:
+    //- html (default)
+    //- lcov (lcov and html)
+    //- lcovonly
+    //- text (standard output)
+    //- text-summary (standard output)
+    //- cobertura (xml format supported by Jenkins)
+    coverageReporter: {
+        // cf. http://gotwarlost.github.io/istanbul/public/apidocs/
+        type : 'html',
+        dir : 'coverage/'
+    },
 
-plugins = [
-  'karma-jasmine',
-  'karma-coverage',
-  'karma-chrome-launcher',
-  'karma-firefox-launcher'
-];
+    plugins: [
+      'karma-jasmine',
+      'karma-coverage',
+      'karma-chrome-launcher',
+      'karma-firefox-launcher'
+    ],
+  });
+};
diff --git a/test/e2e/coverageQunit/karma.conf.js b/test/e2e/coverageQunit/karma.conf.js
index 3be230938..04256752c 100644
--- a/test/e2e/coverageQunit/karma.conf.js
+++ b/test/e2e/coverageQunit/karma.conf.js
@@ -1,36 +1,40 @@
-frameworks = ['qunit'];
+module.exports = function(karma) {
+  karma.configure({
+    frameworks: ['qunit'],
 
-files = [
-  'lib/*.js',
-  'test/*.js'
-];
+    files: [
+      'lib/*.js',
+      'test/*.js'
+    ],
 
-autoWatch = true;
+    autoWatch: true,
 
-browsers = ['Chrome'];
+    browsers: ['Chrome'],
 
-reporters = ['progress', 'coverage'];
+    reporters: ['progress', 'coverage'],
 
-preprocessors = {
-  'lib/*.js': 'coverage'
-};
+    preprocessors: {
+      'lib/*.js': 'coverage'
+    },
 
-//Code Coverage options. report type available:
-//- html (default)
-//- lcov (lcov and html)
-//- lcovonly
-//- text (standard output)
-//- text-summary (standard output)
-//- cobertura (xml format supported by Jenkins)
-coverageReporter = {
-    // cf. http://gotwarlost.github.io/istanbul/public/apidocs/
-    type : 'html',
-    dir : 'coverage/'
-};
+    //Code Coverage options. report type available:
+    //- html (default)
+    //- lcov (lcov and html)
+    //- lcovonly
+    //- text (standard output)
+    //- text-summary (standard output)
+    //- cobertura (xml format supported by Jenkins)
+    coverageReporter: {
+        // cf. http://gotwarlost.github.io/istanbul/public/apidocs/
+        type : 'html',
+        dir : 'coverage/'
+    },
 
-plugins = [
-  'karma-qunit',
-  'karma-coverage',
-  'karma-chrome-launcher',
-  'karma-firefox-launcher'
-];
+    plugins: [
+      'karma-qunit',
+      'karma-coverage',
+      'karma-chrome-launcher',
+      'karma-firefox-launcher'
+    ],
+  });
+};
diff --git a/test/e2e/coverageRequirejs/karma.conf.js b/test/e2e/coverageRequirejs/karma.conf.js
index 34684f8f8..ed1784340 100644
--- a/test/e2e/coverageRequirejs/karma.conf.js
+++ b/test/e2e/coverageRequirejs/karma.conf.js
@@ -1,29 +1,33 @@
-frameworks = ['mocha', 'requirejs'];
+module.exports = function(karma) {
+  karma.configure({
+    frameworks: ['mocha', 'requirejs'],
 
-files = [
-  'main.js',
-  {pattern: '*.js', included: false},
-];
+    files: [
+      'main.js',
+      {pattern: '*.js', included: false},
+    ],
 
-autoWatch = true;
-browsers = ['Chrome'];
-singleRun = false;
+    autoWatch: true,
+    browsers: ['Chrome'],
+    singleRun: false,
 
-reporters = ['progress', 'coverage'];
+    reporters: ['progress', 'coverage'],
 
-preprocessors = {
-  'dependency.js': 'coverage'
-};
+    preprocessors: {
+      'dependency.js': 'coverage'
+    },
 
-coverageReporter = {
-    type : 'html',
-    dir : 'coverage/'
-};
+    coverageReporter: {
+        type : 'html',
+        dir : 'coverage/'
+    },
 
-plugins = [
-  'karma-mocha',
-  'karma-requirejs',
-  'karma-coverage',
-  'karma-chrome-launcher',
-  'karma-firefox-launcher'
-];
+    plugins: [
+      'karma-mocha',
+      'karma-requirejs',
+      'karma-coverage',
+      'karma-chrome-launcher',
+      'karma-firefox-launcher'
+    ],
+  });
+};
diff --git a/test/e2e/junit/karma.conf.js b/test/e2e/junit/karma.conf.js
index 0b9e9062f..73c9e9cb8 100644
--- a/test/e2e/junit/karma.conf.js
+++ b/test/e2e/junit/karma.conf.js
@@ -1,24 +1,28 @@
-frameworks = ['jasmine'];
+module.exports = function(karma) {
+  karma.configure({
+    frameworks: ['jasmine'],
 
-files = [
-  '*.js'
-];
+    files: [
+      '*.js'
+    ],
 
-autoWatch = true;
+    autoWatch: true,
 
-browsers = ['Chrome']
+    browsers: ['Chrome'],
 
-reporters = ['dots', 'junit'];
+    reporters: ['dots', 'junit'],
 
-logLevel = LOG_DEBUG;
+    logLevel: karma.LOG_DEBUG,
 
-junitReporter = {
-  outputFile: 'test-results.xml'
-};
+    junitReporter: {
+      outputFile: 'test-results.xml'
+    },
 
-plugins = [
-  'karma-jasmine',
-  'karma-chrome-launcher',
-  'karma-firefox-launcher',
-  'karma-junit-reporter'
-];
+    plugins: [
+      'karma-jasmine',
+      'karma-chrome-launcher',
+      'karma-firefox-launcher',
+      'karma-junit-reporter'
+    ],
+  });
+};
diff --git a/test/e2e/mocha/karma.conf.js b/test/e2e/mocha/karma.conf.js
index 101d6246c..c5963071b 100644
--- a/test/e2e/mocha/karma.conf.js
+++ b/test/e2e/mocha/karma.conf.js
@@ -1,19 +1,23 @@
-frameworks = ['mocha'];
+module.exports = function(karma) {
+  karma.configure({
+    frameworks: ['mocha'],
 
-files = [
-  '*.js'
-];
+    files: [
+      '*.js'
+    ],
 
-autoWatch = true;
-browsers = ['Chrome'];
-singleRun = false;
+    autoWatch: true,
+    browsers: ['Chrome'],
+    singleRun: false,
 
-browsers = ['Chrome'];
+    browsers: ['Chrome'],
 
-reporters = ['dots'];
+    reporters: ['dots'],
 
-plugins = [
-  'karma-mocha',
-  'karma-chrome-launcher',
-  'karma-firefox-launcher'
-];
+    plugins: [
+      'karma-mocha',
+      'karma-chrome-launcher',
+      'karma-firefox-launcher'
+    ],
+  });
+};
diff --git a/test/e2e/qunit/karma.conf.js b/test/e2e/qunit/karma.conf.js
index ebfb2c8e9..edb7cb5b1 100644
--- a/test/e2e/qunit/karma.conf.js
+++ b/test/e2e/qunit/karma.conf.js
@@ -1,17 +1,21 @@
-frameworks = ['qunit'];
+module.exports = function(karma) {
+  karma.configure({
+    frameworks: ['qunit'],
 
-files = [
-  '*.js'
-];
+    files: [
+      '*.js'
+    ],
 
-autoWatch = true;
+    autoWatch: true,
 
-browsers = ['Chrome'];
+    browsers: ['Chrome'],
 
-reporters = ['dots'];
+    reporters: ['dots'],
 
-plugins = [
-  'karma-qunit',
-  'karma-chrome-launcher',
-  'karma-firefox-launcher'
-];
+    plugins: [
+      'karma-qunit',
+      'karma-chrome-launcher',
+      'karma-firefox-launcher'
+    ],
+  });
+};
diff --git a/test/e2e/requirejs/karma.conf.js b/test/e2e/requirejs/karma.conf.js
index ea6e62020..676fd3601 100644
--- a/test/e2e/requirejs/karma.conf.js
+++ b/test/e2e/requirejs/karma.conf.js
@@ -1,64 +1,67 @@
 // Karma configuration
 // Generated on Thu Jul 26 2012 14:35:23 GMT-0700 (PDT)
 
+module.exports = function(karma) {
+  karma.configure({
+    // base path, that will be used to resolve files and exclude
+    basePath: '',
 
-// base path, that will be used to resolve files and exclude
-basePath = '';
+    frameworks: ['jasmine', 'requirejs'],
 
-frameworks = ['jasmine', 'requirejs'];
+    // list of files / patterns to load in the browser
+    files: [
+      'main.js',
 
-// list of files / patterns to load in the browser
-files = [
-  'main.js',
+      // all the sources, tests
+      {pattern: '*.js', included: false}
+    ],
 
-  // all the sources, tests
-  {pattern: '*.js', included: false}
-];
 
+    // test results reporter to use
+    // possible values: dots || progress
+    reporter: 'dots',
 
-// test results reporter to use
-// possible values: dots || progress
-reporter = 'dots';
 
+    // web server port
+    port: 9876,
 
-// web server port
-port = 9876;
 
+    // cli runner port
+    runnerPort: 9100,
 
-// cli runner port
-runnerPort = 9100;
 
+    // enable / disable colors in the output (reporters and logs)
+    colors: true,
 
-// enable / disable colors in the output (reporters and logs)
-colors = true;
 
+    // level of logging
+    // possible values: LOG_DISABLE || LOG_ERROR || LOG_WARN || LOG_INFO || LOG_DEBUG
+    logLevel: karma.LOG_INFO,
 
-// level of logging
-// possible values: LOG_DISABLE || LOG_ERROR || LOG_WARN || LOG_INFO || LOG_DEBUG
-logLevel = LOG_INFO;
 
+    // enable / disable watching file and executing tests whenever any file changes
+    autoWatch: true,
 
-// enable / disable watching file and executing tests whenever any file changes
-autoWatch = true;
 
+    // Start these browsers, currently available:
+    // - Chrome
+    // - ChromeCanary
+    // - Firefox
+    // - Opera
+    // - Safari
+    // - PhantomJS
+    browsers: ['Chrome'],
 
-// Start these browsers, currently available:
-// - Chrome
-// - ChromeCanary
-// - Firefox
-// - Opera
-// - Safari
-// - PhantomJS
-browsers = ['Chrome'];
 
+    // Continuous Integration mode
+    // if true, it capture browsers, run tests and exit
+    singleRun: false,
 
-// Continuous Integration mode
-// if true, it capture browsers, run tests and exit
-singleRun = false;
-
-plugins = [
-  'karma-requirejs',
-  'karma-jasmine',
-  'karma-chrome-launcher',
-  'karma-firefox-launcher'
-];
+    plugins: [
+      'karma-requirejs',
+      'karma-jasmine',
+      'karma-chrome-launcher',
+      'karma-firefox-launcher'
+    ],
+  });
+};
diff --git a/test/e2e/syntax-error/karma.conf.ignore.js b/test/e2e/syntax-error/karma.conf.ignore.js
index 8bb018408..d20e781e3 100644
--- a/test/e2e/syntax-error/karma.conf.ignore.js
+++ b/test/e2e/syntax-error/karma.conf.ignore.js
@@ -1,21 +1,25 @@
-frameworks = ['jasmine'];
+module.exports = function(karma) {
+  karma.configure({
+    frameworks: ['jasmine'],
 
-// files to load
-files = [
-  '*.js'
-];
+    // files to load
+    files: [
+      '*.js'
+    ],
 
-autoWatch = true;
-autoWatchInterval = 1;
-logLevel = LOG_INFO;
-logColors = true;
+    autoWatch: true,
+    autoWatchInterval: 1,
+    logLevel: karma.LOG_INFO,
+    logColors: true,
 
-browsers = ['Chrome'];
+    browsers: ['Chrome'],
 
-reporters = ['dots'];
+    reporters: ['dots'],
 
-plugins = [
-  'karma-jasmine',
-  'karma-chrome-launcher',
-  'karma-firefox-launcher'
-];
+    plugins: [
+      'karma-jasmine',
+      'karma-chrome-launcher',
+      'karma-firefox-launcher'
+    ],
+  });
+};
diff --git a/test/e2e/timeout/karma.conf.ignore.js b/test/e2e/timeout/karma.conf.ignore.js
index 2ad704da0..c3ef50e45 100644
--- a/test/e2e/timeout/karma.conf.ignore.js
+++ b/test/e2e/timeout/karma.conf.ignore.js
@@ -1,63 +1,67 @@
 // Karma configuration
 // Generated on Sun Sep 30 2012 22:44:01 GMT-0700 (PDT)
 
+module.exports = function(karma) {
+  karma.configure({
 
-// base path, that will be used to resolve files and exclude
-basePath = '';
+    // base path, that will be used to resolve files and exclude
+    basePath: '',
 
-frameworks = ['jasmine'];
+    frameworks: ['jasmine'],
 
-// list of files / patterns to load in the browser
-files = [
-  '*.js'
-];
+    // list of files / patterns to load in the browser
+    files: [
+      '*.js'
+    ],
 
 
-// test results reporter to use
-// possible values: 'dots', 'progress', 'junit'
-reporters = ['progress'];
+    // test results reporter to use
+    // possible values: 'dots', 'progress', 'junit'
+    reporters: ['progress'],
 
 
-// web server port
-port = 8080;
+    // web server port
+    port: 8080,
 
 
-// cli runner port
-runnerPort = 9100;
+    // cli runner port
+    runnerPort: 9100,
 
 
-// enable / disable colors in the output (reporters and logs)
-colors = true;
+    // enable / disable colors in the output (reporters and logs)
+    colors: true,
 
 
-// level of logging
-// possible values: LOG_DISABLE || LOG_ERROR || LOG_WARN || LOG_INFO || LOG_DEBUG
-logLevel = LOG_INFO;
+    // level of logging
+    // possible values: LOG_DISABLE || LOG_ERROR || LOG_WARN || LOG_INFO || LOG_DEBUG
+    logLevel: karma.LOG_INFO,
 
 
-// enable / disable watching file and executing tests whenever any file changes
-autoWatch = true;
+    // enable / disable watching file and executing tests whenever any file changes
+    autoWatch: true,
 
 
-// Start these browsers, currently available:
-// - Chrome
-// - ChromeCanary
-// - Firefox
-// - Opera
-// - Safari (only Mac)
-// - PhantomJS
-// - IE (only Windows)
-browsers = [__dirname + '/fake-browser.sh'];
+    // Start these browsers, currently available:
+    // - Chrome
+    // - ChromeCanary
+    // - Firefox
+    // - Opera
+    // - Safari (only Mac)
+    // - PhantomJS
+    // - IE (only Windows)
+    browsers: [__dirname + '/fake-browser.sh'],
 
-captureTimeout = 1000;
+    captureTimeout: 1000,
 
 
-// Continuous Integration mode
-// if true, it capture browsers, run tests and exit
-singleRun = false;
+    // Continuous Integration mode
+    // if true, it capture browsers, run tests and exit
+    singleRun: false,
 
-plugins = [
-  'karma-jasmine',
-  'karma-chrome-launcher',
-  'karma-firefox-launcher'
-];
+    plugins: [
+      'karma-jasmine',
+      'karma-chrome-launcher',
+      'karma-firefox-launcher'
+    ],
+  });
+};
diff --git a/test/unit/config.spec.coffee b/test/unit/config.spec.coffee
index c28a77f92..3e4f234db 100644
--- a/test/unit/config.spec.coffee
+++ b/test/unit/config.spec.coffee
@@ -2,7 +2,6 @@
 # lib/config.js module
 #==============================================================================
 describe 'config', ->
-  fsMock = require('mocks').fs
   loadFile = require('mocks').loadFile
   mocks = m = e = null
   path = require('path')
@@ -22,41 +21,39 @@ describe 'config', ->
   patternsFrom = (list) ->
     list.map (pattern) -> pattern.pattern
 
+  wrapCfg = (cfg) ->
+    return (karma) ->
+      karma.configure cfg
+
   beforeEach ->
-    # create instance of fs mock
     mocks = {}
     mocks.process = exit: sinon.spy()
-    mocks.fs = fsMock.create
-      bin:
-        sub:
-          'one.js'  : fsMock.file '2011-12-25'
-          'two.js'  : fsMock.file '2011-12-26'
-          'log.txt' : 1
-        mod:
-          'one.js'  : 1
-          'test.xml': 1
-        'file.js' : 1
-        'some.txt': 1
-        'more.js' : 1
-      home:
-        '.vojta'   : 1
-        'config1.js': fsMock.file 0, 'basePath = "base";reporter="dots"'
-        'config2.js': fsMock.file 0, 'basePath = "/abs/base"'
-        'config3.js': fsMock.file 0, 'files = ["one.js", "sub/two.js"];'
-        'config4.js': fsMock.file 0, 'port = 123; autoWatch = true; basePath = "/abs/base"'
-        'config5.js': fsMock.file 0, 'port = {f: __filename, d: __dirname}' # piggyback on port prop
-        'config6.js': fsMock.file 0, 'reporters = "junit";'
-        'config7.js': fsMock.file 0, 'browsers = ["Chrome", "Firefox"];'
-        'config8.js': fsMock.file 0, 'require("fs").readFileSync("/not/a/real/file/path")'
-      conf:
-        'invalid.js': fsMock.file 0, '={function'
-        'exclude.js': fsMock.file 0, 'exclude = ["one.js", "sub/two.js"];'
-        'absolute.js': fsMock.file 0, 'files = ["http://some.com", "https://more.org/file.js"];'
-        'both.js': fsMock.file 0, 'files = ["one.js", "two.js"]; exclude = ["third.js"]'
-        'coffee.coffee': fsMock.file 0, 'files = [ "one.js"\n  "two.js"]'
+    mockConfigs = {
+      '/home/config1.js': wrapCfg({basePath: 'base', reporter: 'dots'}),
+      '/home/config2.js': wrapCfg({basePath: '/abs/base'}),
+      '/home/config3.js': wrapCfg({files: ['one.js', 'sub/two.js']}),
+      '/home/config4.js': wrapCfg({port: 123, autoWatch: true, basePath: '/abs/base'}),
+      '/home/config6.js': wrapCfg({reporters: 'junit'}),
+      '/home/config7.js': wrapCfg({browsers: ['Chrome', 'Firefox']}),
+      '/conf/invalid.js': () -> throw new SyntaxError('Unexpected token =')
+      '/conf/exclude.js': wrapCfg({exclude: ['one.js', 'sub/two.js']}),
+      '/conf/absolute.js': wrapCfg({files: ['http://some.com', 'https://more.org/file.js']}),
+      '/conf/both.js': wrapCfg({files: ['one.js', 'two.js'], exclude: ['third.js']}),
+      '/conf/coffee.coffee': wrapCfg({files: [ 'one.js',  'two.js']}),
+    }
 
     # load file under test
-    m = loadFile __dirname + '/../../lib/config.js', mocks, {process: mocks.process}
+    m = loadFile __dirname + '/../../lib/config.js', mocks, {
+      global: {},
+      process: mocks.process,
+      require: (path) ->
+        if mockConfigs[path]
+          return mockConfigs[path]
+        if path.indexOf('./') is 0
+          require '../../lib/' + path
+        else
+          require path
+    }
     e = m.exports
 
 
@@ -119,15 +116,6 @@ describe 'config', ->
       expect(event.data).to.be.deep.equal ['Config file does not exist!']
       expect(mocks.process.exit).to.have.been.calledWith 1
 
-    it 'should not log config file does not exist if config file throws an ENOENT', ->
-      e.parseConfig '/home/config8.js', {}
-
-      expect(logSpy).to.have.been.called
-      event = logSpy.lastCall.args[0]
-      expect(event.level.toString()).to.be.equal 'ERROR'
-      expect(event.data).to.be.not.deep.equal ['Config file does not exist!']
-      expect(mocks.process.exit).to.have.been.calledWith 1
-
 
     it 'should log error and exit if it is a directory', ->
       e.parseConfig '/conf', {}
@@ -145,7 +133,8 @@ describe 'config', ->
       expect(logSpy).to.have.been.called
       event = logSpy.lastCall.args[0]
       expect(event.level.toString()).to.be.equal 'ERROR'
-      expect(event.data).to.be.deep.equal ['Syntax error in config file!\nUnexpected token =']
+      expect(event.data).to.be.deep.equal ["Error in config file!\n",
+          new SyntaxError('Unexpected token =')]
       expect(mocks.process.exit).to.have.been.calledWith 1
 
 
@@ -200,12 +189,6 @@ describe 'config', ->
       expect(config.require).to.not.exist
 
 
-    it 'should export __filename and __dirname of the config file in the config context', ->
-      config = e.parseConfig '/home/config5.js', {}
-      expect(config.port.f).to.equal '/home/config5.js'
-      expect(config.port.d).to.equal '/home'
-
-
     it 'should normalize urlRoot config', ->
       config = normalizeConfigWithDefaults {urlRoot: ''}
       expect(config.urlRoot).to.equal '/'