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Test First!
requirement -> code!
requirement -> code! requirement -> code!
requirement -> code! requirement -> code! requirement -> code!
requirement -> code! requirement -> code! requirement -> code! requirement -> code!
requirement -> code! requirement -> code! requirement -> code! requirement -> code! requirement -> code!
requirement -> code! requirement -> code! requirement -> code! requirement -> code! requirement -> code! test!
requirement -> test! !
requirement -> test! <- code! !
requirement -> test! <- code! ! requirement -> test! !
requirement -> test! <- code! ! requirement -> test! <- code! !
requirement -> test! <- code! ! requirement -> test! <- code! ! requirement -> test! !
requirement -> test! <- code! ! requirement -> test! <- code! ! requirement -> test! <- code! !
requirement -> test! <- code! ! requirement -> test! <- code! ! requirement -> test! <- code! ! requirement -> test! !
requirement -> test! <- code! ! requirement -> test! <- code! ! requirement -> test! <- code! ! requirement -> test! <- code! !
requirement -> test! <- code! ! requirement -> test! <- code! ! requirement -> test! <- code! ! requirement -> test! <- code! !
requirement -> test! <- code! ! requirement -> test! <- code! ! Refactor! requirement -> test! <- code! ! requirement -> test! <- code! !
requirement -> test! <- code! ! requirement -> test! <- code! ! requirement -> test! <- code! ! requirement -> test! <- code! !
requirement -> test! <- code! ! requirement -> test! <- code! ! requirement -> test! <- code! ! requirement -> test! <- code! !
Test First! ! Faster feedback! Code coverage! Effective tests! Better Code! Refactoring! Productivity! Documentation! Confidence!
Test first?!
Everybody!!
Email validation! /^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+.[a-zA-Z0-9-.]+$/!
Valid email addresses! email@domain.com! firstname.lastname@domain.com! email@subdomain.domain.com! firstname+lastname@domain.com! email@123.123.123.123! email@[123.123.123.123]! "email"@domain.com! 1234567890@domain.com! email@domain-one.com! _______@domain.com! email@domain.name! email@domain.co.jp! firstname-lastname@domain.com! Invalid email addresses! #@%^%#$@#$@#.com! @domain.com! Joe Smith <email@domain.com>! email.domain.com! email@domain@domain.com! .email@domain.com! email.@domain.com! email..email@domain.com! email@domain! email@-domain.com! email@domain.web! email@111.222.333.44444! email@domain..com!
Merge load more data! - (void)mergeData:(NSDictionary *)response! intoStream:(NUSStream *)stream;!
Merge load more data! testMergeData_ShouldUpdateLoadMoreUrl_WhenItExis tsInTheResponse();! ! testMergeData_ShouldClearExistingLoadMoreUrl_Whe nItDoesNotExistInTheResponse();! ! testMergeData_ShouldMergePYMKInOrder_WhenTheResp onseHasPYMKData();! ! testMergeData_ShouldNotCrash_WhenResponseDataHav eEmptyValues();! ! ! //edge case! testMergeData_ShouldNotCrash_WhenResponseDataIsI nvalid();!
Merge load more data! testMergeData_ShouldUpdateLoadMoreUrl_WhenItExis tsInTheResponse();! ! testMergeData_ShouldClearExistingLoadMoreUrl_Whe nItDoesNotExistInTheResponse();! ! testMergeData_ShouldMergePYMKInOrder_WhenTheResp onseHasPYMKData();! ! testMergeData_ShouldNotCrash_WhenResponseDataHav eEmptyValues();! ! ! //edge case! testMergeData_ShouldNotCrash_WhenResponseDataIsI nvalid();!
Faster feedback!
Faster feedback! The code you just wrote isn’t doing what you think.! The line you just removed will break PYMK load more functionality.! Are you crazy? If you remove that conditional check, it would break apps with > 7.0 iOS versions.!
Code coverage!
Code coverage! function save(input) {! if (isValid(input)) {! if (lixEnabled()) {! " " logger.info(‘new save’);! newSave(input);! } else {! logger.info(‘old save’);! if (input.type === ‘x’) {! oldXSave(input);! } else {! oldYSave(input);! }! }! }! }!
Code coverage! // SaveHelper.js! function save(input);! ! ! // SaveHelperSpec.js! testSave();!
Code coverage! // SaveHelper.js! function save(input);! ! ! ! ! ! // SaveHelperSpec.js! testSave_ShouldNotSave_WhenInputIsInvalid();!
Code coverage! // SaveHelper.js! function save(input);! ! ! ! ! // SaveHelperSpec.js! testSave_ShouldNotSave_WhenInputIsInvalid();! testSave_ShouldUseNewAPI_WhenLixEnabled();!
Code coverage! // SaveHelper.js! function save(input);! ! ! ! // SaveHelperSpec.js! testSave_ShouldNotSave_WhenInputIsInvalid();! testSave_ShouldUseNewAPI_WhenLixEnabled();! testSave_ShouldUseOldAPI_WhenLixDisabled();!
Code coverage! // SaveHelper.js! function save(input);! ! ! // SaveHelperSpec.js! testSave_ShouldNotSave_WhenInputIsInvalid();! testSave_ShouldUseNewAPI_WhenLixEnabled();! testSave_ShouldUseOldAPI_WhenLixDisabled();! testSave_ShouldUseOldXAPI_WhenInputTypeIsX();!
Code coverage! // SaveHelper.js! function save(input);! ! // SaveHelperSpec.js! testSave_ShouldNotSave_WhenInputIsInvalid();! testSave_ShouldUseNewAPI_WhenLixEnabled();! testSave_ShouldUseOldAPI_WhenLixDisabled();! testSave_ShouldUseOldXAPI_WhenInputTypeIsX();! testSave_ShouldUseOldYAPI_WhenInputTypeIsY();!
Code coverage! // SaveHelper.js! function save(input);! ! // SaveHelperSpec.js! testSave_ShouldNotSave_WhenInputIsInvalid();! testSave_ShouldUseNewAPI_WhenLixEnabled();! testSave_ShouldUseOldAPI_WhenLixDisabled();! testSave_ShouldUseOldXAPI_WhenInputTypeIsX();! testSave_ShouldUseOldYAPI_WhenInputTypeIsY();!
Effective tests! Fail when the functionality breaks! ! KISS! ! Test functionality, not the implementation.! ! Don’t repeat your code in test.!
Effective tests! Fail when the functionality breaks! // code! paymentService = util.getPS();! paymentService.submit();! ! ! ! ! // unit test assertion! util.stub(‘getPS’).returns(mockService);! mockService.expect(‘submit’);!
Effective tests! Fail when the functionality breaks! // code! paymentService = util.getPS();! paymentService.submit();! ! ! // unit test assertion! util.stub(‘getPS’).returns(mockService);! mockService.expect(‘submit’);! ! forgot to verify!!
Effective tests! Keep It Simple Stupid! // unit test assertion! assert(“m_sim2_guided_edit_photo_add_actionsh eet_camera_tap_use_photo”, result);! ! " " " " " " "(vs)! ! assert(metricsRevisionPrefix + pageKey + widget + actionVerb + name, result);!
Effective tests! Test functionality, not the implementation.! void addNewRow(row) {! . . .! row.setDisplay(“block”);! row.setPaddingTop(0);! row.setMargin(0);! }! ! ! ! ! unit test type 1! verify(rowMock).setDisplay(“block”);! verify(rowMock).setPaddingTop(0);! Verify(rowMock).setMargin(0);!
Effective tests! Test functionality, not the implementation.! void addNewRow(row) {! . . .! row.setDisplay(“block”);! row.setPaddingTop(0);! row.setMargin(0);! }! ! unit test type 1! verify(rowMock).setDisplay(“block”);! verify(rowMock).setPaddingTop(0);! Verify(rowMock).setMargin(0);! ! unit test type 2! assertTrue(lastRow.bottom === newRow.top);!
Effective tests! Don’t repeat your code in the test! String getDateForDisplay() {! Date date = service.loadDate();! SimpleDateFormat dateFormat ! = newSimpleDateFormat("yyyy-MM-dd z");! return dateFormat.format(date);! }! ! // unit test! assertEquals(“2014-02-02 PST”, result);! ! assertEquals(new SimpleDateFormat(“yyyy-MM-dd z”).format(expectedDate), result);!
Better code! Testable! ! Modular! ! Loosely coupled! ! Singletons ! ! Law of Demeter"! ! Complexity!
Refactoring! Restructuring code without changing its functionality! ! ! Refactoring now & later! ! ! Migration projects!
Productivity! Faster Feedback! ! No wasting time with debugger! ! Avoid dependencies! ! Save time now and later! ! It doesn’t slow you down!
Productivity!
Documentation! Working examples of code!
Documentation! Working examples of code! Tests won’t get outdated!
Confidence! When you develop new features! When you handover your work! Try it! And you’ll feel it!!
Test First! ! Faster feedback! Code coverage! Effective tests! Better Code! Refactoring! Productivity! Documentation! Confidence!
Thank you!!

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