Karma sample

app.js

// js/app.js

function add(a, b) {
  return a+b;
}

function say(text) {
  document.body.textContent = text;
}

app.test.js

// test/app.test.js

describe("Test suite", function() {
  it("can add stuff", function() {
    expect(add(2,3)).toEqual(5)
  });

  it("can write things into the document", function() {
    say("Ohai");
    expect(document.body.textContent).toEqual("Ohai");
  });
});

demo.config.js

// Karma configuration
// Generated on Wed Jan 21 2015 19:14:41 GMT+0100 (CET)

module.exports = function(config) {
  config.set({
    basePath: '',
    frameworks: ['jasmine'],
    files: [
      'js/*.js',
      'test/*.js'
    ],
    exclude: [],
    preprocessors: {},
    reporters: ['progress'],
    port: 9876,
    colors: true,
    logLevel: config.LOG_INFO,
    autoWatch: true,
    browsers: ['Chrome'],
    singleRun: false
  });
};