Example browser test that registers a service worker file that will contain JS Unit Tests

run-sw-tests.js

describe('Run SW Unit Tests', function() {
  beforeEach(function() {
    return window.__testCleanup();
  });

  after(function() {
    return window.__testCleanup();
  });

  it('should run sw-unit-tests.js unit tests', function() {
    return navigator.serviceWorker.register('/test/sw/sw-unit-tests.js')
    .then((reg) => {
      return window.__waitForSWState(reg, 'activated');
    });
  });
});