Adam Dangoor - Verified Fakes of Web Services

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@adamdangoor adamtheturtle VERIFIED FAKES OF WEBSERVICES

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@adamdangoor adamtheturtle VERIFIED FAKES OF WEBSERVICES

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VUFORIA WEB SERVICES

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VUFORIA WEB SERVICES

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VUFORIA WEB SERVICES OUR APP DATABASE

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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’])

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INITIAL TEST CASE DATABASEPHOTO RESULT

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

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PROBLEMS

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PROBLEMS ๏ FLAKY TESTS

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PROBLEMS ๏ FLAKY TESTS

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PROBLEMS ๏ FLAKY TESTS ๏€ € €

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

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INTEGRATION TESTS UNIT TESTS

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INTEGRATION TESTS UNIT TESTS

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‣ COVER ALOT OF CODE PER TEST ‣ COVER LESS CODE PER TEST INTEGRATION TESTS UNIT TESTS

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‣ COVER ALOT OF CODE PER TEST ‣ CAN BE SLOW ‣ COVER LESS CODE PER TEST ‣ FAST INTEGRATION TESTS UNIT TESTS

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‣ COVER ALOT OF CODE PER TEST ‣ CAN BE SLOW ‣ COVER LESS CODE PER TEST ‣ FAST INTEGRATION TESTS UNIT TESTS

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MOCKS

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MOCKS

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MOCKS

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

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

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PYTEST FIXTURES $ pipinstall 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(): ...

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@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

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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

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

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

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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

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USING THE MOCKIN 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”

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๏ HUMAN ERROR PROBLEMSWITH MOCKS

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๏ HUMAN ERROR ๏BECOME OUTDATED PROBLEMS WITH MOCKS

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VWS-PYTHON COMING SOON TOPYPI

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GOALS ๏ PYTHON LIBRARYFOR VUFORIA ๏ MOCK ANYONE CAN USE

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TRAVIS CI ๏ FREEFOR OSS ๏ SUPPORT FOR SECRETS

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๏ FREE FOROSS ๏ SUPPORT FOR SECRETS TRAVIS CI

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WRITING A MOCK

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VERIFIED FAKE [A veriﬁedfake] 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

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

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

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PARAMETRIZING PYTEST FIXTURES @pytest.fixture( params=[True, False], ids=['RealVuforia', '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

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

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

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๏ WE TRUSTTHE MOCK…SO WE TRUST THE TESTS WHICH USE THE MOCK BENEFITS

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๏ WE TRUSTTHE MOCK…SO WE TRUST THE TESTS WHICH USE THE MOCK BENEFITS

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๏ TESTS TELLUS IF THE MOCK IS OUTDATED BENEFITS

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๏ TESTS TELLUS IF THE MOCK IS OUTDATED BENEFITS

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SCHEDULED TESTS WITH TRAVIS CICRON JOBS

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WHEN THE SERVICE CHANGES

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@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)

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test_add_target.py::test_zero_width[Real Vuforia]FAILED test_add_target.py::test_zero_width[Mock Vuforia]PASSED TESTRESULTS

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

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

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

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SHIPPING A VERIFIED FAKEADDS VALUE TO YOUR PRODUCT

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CROSS- LANGUAGE SUPPORT

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DOCKER

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DOCKER

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CHEERS @adamdangoor adamtheturtle

Adam Dangoor - Verified Fakes of Web Services

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