Adam Dangoor - Verified Fakes of Web Services

1. @adamdangoor adamtheturtle VERIFIED FAKES OF WEB SERVICES

2. @adamdangoor adamtheturtle VERIFIED FAKES OF WEB SERVICES

4. VUFORIA WEB SERVICES

5. VUFORIA WEB SERVICES

6. VUFORIA WEB SERVICES OUR APP DATABASE

7. def get_match(image): ... response = requests.request( method=‘GET', url=‘https://vws.vuforia.com/match', data={‘image’: b64encode(image)}, ) return wine_from_db(id=response.json()[‘id’])

9. INITIAL TEST CASE DATABASE PHOTO RESULT

10. def test_match_wine(): add_wine(image=blue_nun, name=“Blue Nun”) add_wine(image=cristal, name=“Cristal”) result = get_match(image=blue_nun) assert result.name == ”Blue Nun” INITIAL TEST CASE

11. PROBLEMS

12. PROBLEMS ๏ FLAKY TESTS

13. PROBLEMS ๏ FLAKY TESTS

14. PROBLEMS ๏ FLAKY TESTS ๏ € € €

15. PROBLEMS ๏ FLAKY TESTS ๏ € € € ๏ SLOW TESTS ๏ RESOURCE LIMITS

16. INTEGRATION TESTS UNIT TESTS

17. INTEGRATION TESTS UNIT TESTS

18. ‣ COVER A LOT OF CODE PER TEST ‣ COVER LESS CODE PER TEST INTEGRATION TESTS UNIT TESTS

19. ‣ COVER A LOT OF CODE PER TEST ‣ CAN BE SLOW ‣ COVER LESS CODE PER TEST ‣ FAST INTEGRATION TESTS UNIT TESTS

20. ‣ COVER A LOT OF CODE PER TEST ‣ CAN BE SLOW ‣ COVER LESS CODE PER TEST ‣ FAST INTEGRATION TESTS UNIT TESTS

21. MOCKS

22. MOCKS

23. MOCKS

24. MOCKING REQUESTS $ pip install requests-mock with requests_mock.mock() as mock: mock.get('http://test.com', text='data') print(requests.get('http://test.com').text) # prints 'data'

25. MOCKING REQUESTS $ pip install requests-mock with requests_mock.mock() as mock: mock.get('http://test.com', text='data') print(requests.get('http://test.com').text) # prints 'data'

26. PYTEST FIXTURES $ pip install pytest @pytest.fixture() def mock_vuforia() -> Generator: with requests_mock.mock() as mock: mock.get('http://test.com', text='data') ... yield @pytest.mark.usefixture('mock_vuforia') def test_add_target(): ...

27. @pytest.fixture() def mock_vuforia() -> Generator: with requests_mock.mock() as mock: mock.get('http://test.com', text='data') ... yield @pytest.mark.usefixture('mock_vuforia') def test_add_target(): ... PYTEST FIXTURES $ pip install pytest

28. REQUESTS-MOCK DYNAMIC RESPONSES @pytest.fixture() def mock_vuforia() -> Generator: pattern = re.compile(‘http://vws.vuforia.com/targets/w+') with requests_mock.mock() as mock: mock.register_uri( ‘POST', pattern, text=add_target_to_database, ) ... yield

29. REQUESTS-MOCK DYNAMIC RESPONSES def add_target_to_database(request, context): context.headers['Date'] = rfc_1123_date() return json.dumps({'status': 'added'})

30. REQUESTS-MOCK DYNAMIC RESPONSES def add_target_to_database(request, context): context.headers['Date'] = rfc_1123_date() return json.dumps({'status': 'added'})

31. REQUESTS-MOCK DYNAMIC RESPONSES def add_target_to_database(request, context): context.headers['Date'] = rfc_1123_date() return json.dumps({'status': 'added'}) @pytest.fixture() def mock_vuforia() -> Generator: pattern = re.compile(‘http://vws.vuforia.com/targets/w+') with requests_mock.mock() as mock: mock.register_uri( ‘POST', pattern, text=add_target_to_database, ) ... yield

32. USING THE MOCK IN A TEST @pytest.mark.usefixtures(‘mock_vuforia’) def test_match_wine(): add_wine(image=blue_nun, name=“Blue Nun”) add_wine(image=cristal, name=“Cristal”) result = get_match(image=blue_nun) assert result.name == ”Blue Nun”

33. ๏ HUMAN ERROR PROBLEMS WITH MOCKS

34. ๏ HUMAN ERROR ๏ BECOME OUTDATED PROBLEMS WITH MOCKS

35. VWS-PYTHON COMING SOON TO PYPI

36. GOALS ๏ PYTHON LIBRARY FOR VUFORIA ๏ MOCK ANYONE CAN USE

37. TRAVIS CI ๏ FREE FOR OSS ๏ SUPPORT FOR SECRETS

38. ๏ FREE FOR OSS ๏ SUPPORT FOR SECRETS TRAVIS CI

39. WRITING A MOCK

40. VERIFIED FAKE [A veriﬁed fake] is veriﬁed against (a subset of) the same test suite as the real implementation, as well as providing an introspection API that allows test cases to verify that it did the right thing. — Glyph

46. PARAMETRIZING PYTEST FIXTURES @pytest.fixture(params=[True, False]) def my_fixture(request): assert request.param decorated_test[True]PASSED decorated_test[False]FAILED @pytest.mark.usefixtures(‘my_fixture’) def decorated_test(): pass

47. PARAMETRIZING PYTEST FIXTURES @pytest.fixture(params=[True, False]) def my_fixture(request): assert request.param decorated_test[True]PASSED decorated_test[False]FAILED @pytest.mark.usefixtures(‘my_fixture’) def decorated_test(): pass

48. PARAMETRIZING PYTEST FIXTURES @pytest.fixture( params=[True, False], ids=['Real Vuforia', 'Mock Vuforia']) def verify_fake_vuforia(request): use_real_vuforia = request.param if use_real_vuforia: yield else: pattern = re.compile(‘http://vws.vuforia.com/targets/w+') with requests_mock.mock() as mock: mock.post(pattern, text=add_target_to_database) ... yield

49. TEST RESULTS test_add_target.py::test_existing_target_name[Real Vuforia]PASSED test_add_target.py::test_existing_target_name[Mock Vuforia]PASSED

50. TEST RESULTS test_add_target.py::test_existing_target_name[Real Vuforia]PASSED test_add_target.py::test_existing_target_name[Mock Vuforia]PASSED

51. ๏ WE TRUST THE MOCK…SO WE TRUST THE TESTS WHICH USE THE MOCK BENEFITS

52. ๏ WE TRUST THE MOCK…SO WE TRUST THE TESTS WHICH USE THE MOCK BENEFITS

53. ๏ TESTS TELL US IF THE MOCK IS OUTDATED BENEFITS

54. ๏ TESTS TELL US IF THE MOCK IS OUTDATED BENEFITS

55. SCHEDULED TESTS WITH TRAVIS CI CRON JOBS

59. WHEN THE SERVICE CHANGES

60. @pytest.mark.usefixtures(‘verify_fake_vuforia’) def test_zero_width_valid(): data = { 'name': 'example', 'width': 0, 'image': image_data_encoded, } response = add_target_to_vws(data=data) assert_success(response=response)

62. test_add_target.py::test_zero_width[Real Vuforia]FAILED test_add_target.py::test_zero_width[Mock Vuforia]PASSED TEST RESULTS

63. test_add_target.py::test_zero_width[Real Vuforia]FAILED test_add_target.py::test_zero_width[Mock Vuforia]PASSED TEST RESULTS test_add_target.py::test_zero_width[Real Vuforia]FAILED test_add_target.py::test_zero_width[Mock Vuforia]PASSED TEST RESULTS

67. TEST RESULTS test_add_target.py::test_zero_width[Real Vuforia]FAILED test_add_target.py::test_zero_width[Mock Vuforia]PASSED test_add_target.py::test_zero_width[Real Vuforia]FAILED test_add_target.py::test_zero_width[Mock Vuforia]PASSED TEST RESULTS

68. TEST RESULTS test_add_target.py::test_zero_width[Real Vuforia]FAILED test_add_target.py::test_zero_width[Mock Vuforia]PASSED test_add_target.py::test_zero_width[Real Vuforia]FAILED test_add_target.py::test_zero_width[Mock Vuforia]PASSED TEST RESULTS

69. SHIPPING A VERIFIED FAKE ADDS VALUE TO YOUR PRODUCT

74. CROSS- LANGUAGE SUPPORT

75. DOCKER

76. DOCKER

77. CHEERS @adamdangoor adamtheturtle

Adam Dangoor - Verified Fakes of Web Services

Adam Dangoor - Verified Fakes of Web Services

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