{"id":1663,"date":"2019-01-17T22:00:00","date_gmt":"2019-01-17T21:00:00","guid":{"rendered":"https:\/\/demo.sidekick.be\/itenium\/javascript-testing-jasmine-async\/"},"modified":"2025-11-28T13:31:46","modified_gmt":"2025-11-28T12:31:46","slug":"javascript-testing-jasmine-async","status":"publish","type":"post","link":"https:\/\/demo.sidekick.be\/itenium\/blog\/javascript\/javascript-testing-jasmine-async\/","title":{"rendered":"JavaScript Testing: Jasmine async syntax"},"content":{"rendered":"

Example<\/h1>\n

it<\/code>, beforeEach<\/code>, afterAll<\/code>, \u2026 have an additional optional parameter called timeout (ms). A test fails for such a block when nor done()<\/code> nor done.fail()<\/code> is called within jasmine.DEFAULT_TIMEOUT_INTERVAL<\/code> which defaults to 5000 (ms).<\/p>\n

it('can use async\/await', async () => {\n  const pie = await Promise.resolve(3.14);\n  expect(pie).toBe(3.14);\n});\n\n\nbeforeAll(done => {\n  \/\/ The same construct can be used for\n  \/\/ beforeEach, afterEach and afterAll\n  done();\n}, customTimeout);\n\nit('has an optional \"done\" parameter', done => {\n  Promise.resolve()\n    .then(() => expect(true).toBeTruthy())\n    .then(done)\n    .catch(done.fail);\n});\n\nxit('can fail with a specific message', done => {\n  Promise.reject().catch(done.fail.bind(this, 'done.fail(\"with your error message\")'));\n}, customTimeout);\n<\/code><\/pre>\n
Time Travel<\/h1>\n
beforeEach(() => jasmine.clock().install());\n\nit(\"doesn't have to take the slow path\", () => {\n  var timePassed = 0;\n  setTimeout(() => {\n    timePassed += 100;\n  }, 100);\n\n  expect(timePassed).toBe(0);\n  jasmine.clock().tick(100);\n  expect(timePassed).toBe(100);\n});\n\n\nit('can hijack new Date', () => {\n  const baseTime = new Date(2013, 9, 23);\n  jasmine.clock().mockDate(baseTime);\n\n  jasmine.clock().tick(50);\n  expect(new Date().getTime()).toEqual(baseTime.getTime() + 50);\n});\n\n\nafterEach(() => jasmine.clock().uninstall());\n<\/code><\/pre>\n
expectAsync<\/h1>\n
it('can check for resolved', async () => {\n  const pie = Promise.resolve(3.14);\n  await expectAsync(pie).toBeResolved();\n  return expectAsync(pie).toBeResolvedTo(3.14);\n});\n\nit('can check for rejected', async () => {\n  const pie = Promise.reject('reasons');\n  await expectAsync(pie).toBeRejected();\n  await expectAsync(pie).toBeRejectedWith('reasons');\n});\n\nit('can pass context - which will show on failure', async () => {\n  const pie = Promise.resolve(42);\n  await expectAsync(pie).withContext('test').toBeResolved();\n});\n<\/code><\/pre>\n
Also in this series<\/h1>\n