This document discusses unit testing, including why testing is important, how to begin unit testing, asynchronous testing, and performance testing. It provides an overview of using XCTest to write unit tests in Xcode, including test targets, running and viewing test results. It covers writing asynchronous tests using expectations and measuring performance using the measureBlock method. The document recommends setting baselines and standard deviations for performance tests and provides references for learning more about unit and UI testing.

1. Unit Test
Đức Trần

2. Unit Test
Why Testing?
Beginning Unit Test
Asynchronous Testing
Performance Testing

3. Why Testing?
Find bug
Clear requirement
Maintenance

4. How?
1. Code
2. Add Tests
3. Modify code for passing Tests
Vs
1. Write Tests
2. Write code that pass Tests (Test-Driven Development)

5. Beginning Unit Test

6. Beginning Unit Test
XCTest
Test Target
Running Test
Viewing Result

7. XCTest
Subclass XCTestCase
Implement Test method
(Beginning with “test”)
- (void)testMyMethodWorks
Use Assertion (Macro) APIs to report failures
- XCTAssertEqual(value, expectValue);

8. Test Target
Test Target:
- Test code
- Resources
Automatically included in new project
Existing projects can add test targets

9. Running Test
Command+U
Buttons in source editor sidebar
Buttons in Test Navigator

10. Viewing Result
Test Navigator

11. Viewing Result
Test Navigator
Issue Navigator

12. Viewing Result
Test Navigator
Issue Navigator
Source Editor

13. Viewing Result
Test Navigator
Issue Navigator
Source Editor
Test Report

14. Demo
Adding Test Case

15. Prepare “fake” data

16. Create Model

17. Create Service

18. Write Test Case

19. Implement Method
Write code to implement methods.
Check if test cases are passed

20. Asynchronous Testing

21. Asynchronous Testing
Create Expectation Object:
- XCTestExpectation *expectation = [self expectationWithDescription:@"Load Data"];
XCTestCase waits for Expectations to “Fullfill”
- (void)waitForExpectationsWithTimeout:(NSTimeInterval)timeout handler:(nullable
XCWaitCompletionHandler)handler;
Handle when finishing asynchronous tasks:
- [expectation fulfill];

22. Demo
Asynchronous Testing

23. Add Asynchronous method

24. Write Test case

25. Implement method
Write code to implement methods.
Check if test cases are passed

26. Performance Testing

27. Performance Testing
How to measure app performance?
How to find which part causes performance problem?
=> Performance Testing.

28. Measuring Performance
Test code block:
- (void)measureBlock:(void (^)(void))block;
Runs code block 10 time
Measures time
Results show in Xcode

29. Performance Testing
Setting Baselines
Setting Standard Deviation (STDDEV)

30. Setting Baselines
Baselines is Average run time
Detect Regressions:
- Fail if (Baselines Average)>0.1 seconds and >10%
Baselines are stored in sources
Baselines are per-device configuration:
- Device model, CPU, OS

31. Setting Baseline
No Baseline Set Baseline

32. Setting Baselines
Normal case (Baseline 1s) Error Case (Baseline 1s)

33. Setting Baseline
Baselines are not enough

34. Setting Standard Deviation (STDDEV)
Fail if (STDDEV)>0.1 seconds and >10%

35. Standard Deviation
Why STDDEV too big?
- File I/O, Network I/O?
- Initialization?
- Does it do the same work each time it's called?
- System busy?

36. Profiling Test
Investigate functions’ performance

37. Demo
Performance Testing

38. Performance Test

39. Summary
Why Testing?
Beginning Unit Test
Asynchronous Testing
Performance Testing

40. Reference
WWDC’s video: https://developer.apple.com/videos/play/wwdc2014/414/
Unit Test Sample:
https://developer.apple.com/library/mac/samplecode/UnitTests/History/History.
html#//apple_ref/doc/uid/DTS40011742-RevisionHistory-DontLinkElementID_1
Udacity Course: https://www.udacity.com/course/viewer#!/c-cs212/l-
48688918/m-48276959
Demo Source: https://www.dropbox.com/s/mhjpllmxugyf02c/UnitTest.zip?dl=1

41. QA?
1. How to implement UITest?
- Checkout apple’s Sample app:
https://developer.apple.com/library/mac/samplecode/UnitTests/History/Hist
ory.html#//apple_ref/doc/uid/DTS40011742-RevisionHistory-
DontLinkElementID_1
- Checkout this WWDC session:
https://developer.apple.com/videos/play/wwdc2015/406/

42. Assignment
Write a sample app using UnitTest
- Which test cases should we have to cover?

43. Thanks for watching!