Testing your Swift Code

Swift has experienced fantastic adoption over the past few years as developers transition away from Objective-C. Unfortunately, some of the tried and true Objective-C testing strategies don’t easily apply to Swift. In this talk we’ll take a deep dive into ways to test your Swift code. We’ll cover unit tests, UI tests, and introduce some helpful testing libraries. We’ll also talk about how you can take your tests to the next level by setting up a continuous integration and automatic deployment workflow.

Transcript

1. Testing your Swift Code M AT T N E D R I C H
2. ABOUT ME AT O M I C O B J E C T M AT T N E D R I C H @ M AT T N E D R I C H M AT T. N E D R I C H @ AT O M I C O B J E C T. C O M
3. GOAL Introduce basic testing approaches in Swift Unit Tests UI Tests Discuss some useful libraries Continuous Integration & Automatic Deployment
4. Changing Landscape [Objective C]
9. What’s the deal with Swift? ¯\_(ϑ)_/¯
10. WHATS THE DEAL WITH SWIFT Limited reflection support Required by most mocking approaches Different runtime rules Can still write lots of great tests though
11. XCTest
12. https://github.com/mattnedrich/codemash-testing-demo
13. XCTEST EXAMPLE
14. XCTEST ASSERTIONS XCTAssertEqual(expression1, expression2, format…) XCTAssertNil(expression, format…) XCTAssertNotNil(expression, format...) XCTAssertTrue(expression, format…) XCTAssertThrows(expression, format…) XCTAssertNoThrow(expression, format...)
15. XCTEST SYNCHRONOUS EXAMPLE
16. XCTEST SYNCHRONOUS EXAMPLE
17. XCTEST ASYNCHRONOUS EXAMPLE
18. XCTEST ASYNCHRONOUS EXAMPLE
19. UIViewController
20. UIVIEWCONTROLLER Test outlets Test some simple UI behavior
21. UIVIEWCONTROLLER
23. UITABLECONTROLLER
25. XCTEST SUMMARY Bare Bones, lots of boilerplate Poor test readability Can find ways to test most scenarios
26. Testing Libraries
27. QUICK AND NIMBLE
28. QUICK AND NIMBLE
29. QUICK AND NIMBLE
30. QUICK AND NIMBLE XCTEST
31. PREVIOUS ASYNC EXAMPLE
32. QUICK AND NIMBLE - ASYNC
33. Mocking
34. H T T P : / / B L O G . P R A G M AT I C E N G I N E E R . C O M / S W I F T - T H E - O N LY - M O D E R N - L A N G U A G E - W I T H - N O - M O C K I N G - F R A M E W O R K /
35. SWIFT TEST MOCKING Traditional mocking support does not exist Can create sub classes and override functions Must loosely couple things and rely on protocols for everything This can be great It can also lead to a large amount of unnecessary abstraction
36. MOCKING LIBRARIES Some libraries do exist Usually create types ahead of time in batch Anyone have experience with them?
37. UI Testing
38. UI TESTING Allow tests to perform UI interactions and assert behavior Similar to KIF tests Can work nicely as end-to-end or integration tests
40. UI TESTING
41. UI TESTING
42. UI TESTING
44. UI TESTING - PASS DATA TO TEST Use the launch arguments
45. UI Testing - Recording
47. Continuous Integration
48. LOTS OF CI OPTIONS Circle CI Travis CI TeamCity …
49. Circle CI
52. +
53. STEP 1: PUT YOUR PROJECT ON GITHUB
54. STEP 2: SHARE YOUR XCODE SCHEME
55. STEP 3: PUSH TO GITHUB, LOG INTO CIRCLE CI
56. STEP 4: SELECT YOUR PROJECT AND REPOSITORY
57. STEP 5: CIRCLE CI WILL BUILD YOUR PROJECT
58. STEP 5: FAILED BUILD
59. STEP 6: ADD CIRCLE.YML CONFIGURATION FILE
60. STEP 7: RE-RUN WITH XCODE 8.2
62. CIRCLE CI IS NOW WORKING Your project will be built and tests will be run every time someone pushes to master Everyone subscribed to the Github repository will receive email notifications
63. What About Deployment?
64. GOAL Every time a change is pushed to master Build project Run tests If tests pass, push build to TestFlight or HockeyApp, etc. Release build to test users with the press of a button
65. STEP 1: INSTALL FASTLANE
66. STEP 1: INSTALL FASTLANE
67. STEP 2: CREATE CERTIFICATES
68. STEP 2: CREATE CERTIFICATES fastlane cert --output_path certificates This will create three files something.cer something.certSigningRequest something.p12
69. STEP 2: CREATE CERTIFICATES
70. STEP 3: CREATE PROVISIONING PROFILE
71. STEP 3: CREATE PROVISIONING PROFILE fastlane sigh This will create something like AppStore_com.mattnedrich.codemash-testing-demo.mobileprovision
72. STEP 3: CREATE PROVISIONING PROFILE
73. STEP 4: USE GYM TO DISTRIBUTE YOUR APP
74. STEP 4: USE GYM TO DISTRIBUTE YOUR APP
75. STEP 4: USE GYM TO DISTRIBUTE YOUR APP