application.js

function thisIsATest(){
  return true;
}

grunt.js

var testacular = require('testacular');
/*global module:false*/
module.exports = function(grunt) {
  grunt.loadNpmTasks('grunt-coffee');

  // Project configuration.
  grunt.initConfig({
    clean: ["../public/assets/js/debug", "../public/assets/js/release"],

    lint: {
      files: [
        'grunt.js',
        'app/**/*.js'
      ]
    },
    spec: {
      files: ['spec/javascripts/**/*.js']
    },
    coffee: {
      build: {
        src: ['spec/**/*.coffee']
      }
    },
    watch: {
      files: ['<config:coffee.build.src>'],
      tasks: 'coffee'
    },
    jshint: {
      options: {
        curly: true,
        eqeqeq: true,
        immed: true,
        latedef: true,
        newcap: true,
        noarg: true,
        sub: true,
        undef: true,
        boss: true,
        eqnull: true
      },
      globals: {
        jQuery: true
      }
    }
  });

  // Default task.
  grunt.registerTask('default');
  grunt.registerTask('server','start testacular server', function(){
    // mark the task as async but never call done so t5he server stays up.
    var done = this.async();
    testacular.server.start('spec/testacular.config.js');
  });

  grunt.registerTask('test', 'run tests (make sure server task is run first)', function() {
    var done = this.async();
    grunt.utils.spawn({
      cmd: 'testacular-run',
      args: ['spec/testacular.config.js']
    }, function(error, result, code) {
      if (error) {
        grunt.warn("Make sure the testacular server is online: run `grunt server`.\n"+
          "Also make sure you have a browser open to http://localhost:8080/.\n"+
          error.stdout+error.stderr);
        //the testacular runner somehow modifies the files if it errors(??).
        //this causes grunt's watch task to re-fire itself constantly,
        //unless we wait for a sec
        setTimeout(done, 1000);
      } else {
        grunt.log.write(result.stdout);
        done();
      }
    });
  });
};

spec__application_spec.js

// = require application

describe("a js spec", function(){

  it("should load my application", function(){
    expect(thisIsATest()).toBeTrue();
  });

  it("should be a success", function(){
    expect(true).toEqual(true);
  });

});

testacular.config.js

// Sample Testacular configuration file, that contain pretty much all the available options
// It's used for running client tests on Travis (http://travis-ci.org/#!/vojtajina/testacular)
// Most of the options can be overriden by cli arguments (see testacular --help)


// base path, that will be used to resolve files and exclude
basePath = 'javascripts';

// list of files / patterns to load in the browser
files = [
  JASMINE,
  JASMINE_ADAPTER,
  '*_spec.js',
  '*/*_spec.js'
];

// list of files to exclude
exclude = [];

// use dots reporter, as travis terminal does not support escaping sequences
// possible values: 'dots' || 'progress'
reporter = 'progress';

// web server port
port = 8080;

// cli runner port
runnerPort = 9100;

// 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;

// enable / disable watching file and executing tests whenever any file changes
autoWatch = true;

// polling interval in ms (ignored on OS that support inotify)
autoWatchInterval = 100;

// Start these browsers, currently available:
// - Chrome
// - ChromeCanary
// - Firefox
// - Opera
// - Safari
// - PhantomJS
browsers = ["Safari"];

// Auto run tests on start (when browsers are captured) and exit
singleRun = false;