old_contents: module.exports = function(config) {
    config.set({
      frameworks: [ "mocha" ],
      files: [
        "test/mocha/vendor/chai.js",
        "vendor/bower/requirejs/require.js",
        "test/mocha/test-runner.js"
      ]
    });
  };
  
new_contents: module.exports = function(config) {
    config.set({
      frameworks: [ "mocha" ],
      files: [
        "vendor/bower/chai/chai.js",
        "vendor/bower/requirejs/require.js",
        "test/mocha/test-runner.js"
      ]
    });
  };
  
subject: Fix path to chai in mocha karma.conf.js