This document discusses unit testing for mobile apps. It provides an overview of unit testing, including why to test code (to fix bugs early, refine design, ease changes, and provide documentation), how to test code (after writing, before writing, and after fixing bugs), and popular tools for unit testing iOS and Android apps, such as XCTest, JUnit, and Robolectric. Code samples are provided to demonstrate unit testing with XCTest, OCMock, JUnit, and Mockito. The presentation concludes with a demo of testing with KIF and a call for questions.

1. Unit Testing on Mobile
Apps
Buşra Deniz
busradeniz89@gmail.com
@busradeniz

2. Agenda
● Unit Test
● Why test your code?
● How to unit test ?
● When test your code ?
● Tools for iOS Unit Testing
● Tools for Android Unit Testing
● Demo
● Questions

3. Unit Test
Testing a single unit of code.

4. Why test your code ?
● Fix bug early

5. Why test your code ?
● Fix bug early
● Refine design

6. Why test your code ?
● Fix bug early
● Refine design
● Easier to make changes

7. Why test your code ?
● Fix bug early
● Refine design
● Easier to make changes
● Useful documentation

8. Why test your code ?
● Fix bug early
● Refine design
● Easier to make changes
● Useful documentation
● Reduce testing time

9. How to Unit Test ?
“Never test the depth of the water
with both feet”

10. When test your code ?
● After writing code

11. When test your code ?
● After writing code
● Before writing code

12. When test your code ?
● After writing code
● Before writing code
● After fixing a bug

13. Tools for iOS Unit Testing
● OCUnit / SenTestKit
● XCTest
● GHUnit
● OCMock
● KIF
● Specta, Frank, Kiwi, Cedar , Google ToolKit
for Mac, CATCH vs.

14. Test Suite
- (void) setUp {
[super setUp];
// Put setup code here. This method is called before the invocation of each test method in the class.
}
- (void) tearDown {
// Put teardown code here. This method is called after the invocation of each test method in the class.
[super tearDown];
}
- (void) testExample {
// write your test code
XCTFail(@"No implementation for "%s"", __PRETTY_FUNCTION__);
}

15. XCTest Code Sample
- (void)test_PostRequestCreationWithoutHeaders
{
RestBody *restBody = [[RestBody alloc] init];
[restBody addHeaderItem:@"demoBodyKey" andValue:@"demoBodyValue"];
[restBody addHeaderItem:@"demoBodyKey2" andValue:@"demoBodyValue2"];
restPostRequest = [[RestPostRequest alloc] init:restBody andServiceUrlSuffix:serviceUrlSuffix];
XCTAssertNotNil(restPostRequest.serviceUrlSuffix, @"Service URL suffix cannot be nil");
XCTAssertNotNil(restPostRequest.messageHeader, @"Headers cannot be nil");
XCTAssertNotNil(restPostRequest.messageBody, @"Body cannot be nil");
XCTAssertEqual(serviceUrlSuffix, restPostRequest.serviceUrlSuffix, @"Service URL suffix must equal to %@" ,serviceUrlSuffix
);
XCTAssertEqual( (NSUInteger)7 , restPostRequest.messageHeader.messageHeader.allKeys.count , @"Header size is wrong");
XCTAssertEqual( (NSUInteger)2 , restPostRequest.messageBody.messageBody.allKeys.count , @"Body size is wrong");
XCTAssertTrue([restPostRequest.messageBody.messageBody objectForKey:@"demoBodyKey"], @"RestRequest body must
contain %@" , @"demoBodyKey");
}

16. OCMock with XCTest Code Sample
-(void) test_Connect {
id notificationComponent = [OCMockObject mockForClass:[NotificationComponent
class] ];
id notificationEngine = [OCMockObject mockForClass:[NotificationEngine class]];
[notificationEngine setNotificationComponent:notificationEngine];
[[notificationComponent expect] connect:@""];
[notificationEngine connect:@""];
[notificationEngine verify];
}

17. Tools for Android Unit Testing
● JUnit
● Robolectric
● Robotium
● Mockhito
● PowerMock, EasyMock vs.

18. JUnit with Mockhito Code Sample
public void connectTest() {
NotificationComponentInterface notificationComponent =
Mockito.mock(NotificationComponentInterface.class);
notificationEngine.setNotificationComponenent(notificationComponent);
notificationEngine.connect();
try {
Mockito.verify(notificationComponent, Mockito.times(1)).connect();
} catch (MockitoAssertionError e) {
throw new MockitoAssertionError(TAG + "notificationComponent.connect() method failed! " +
e.getMessage());
}
}

19. Robolectric Sample Code
public class MyActivityTest {
@Test
public void clickingButton_shouldChangeResultsViewText() throws Exception {
Activity activity = Robolectric.buildActivity(MyActivity.class).create().get();
Button pressMeButton = (Button) activity.findViewById(R.id.press_me_button);
TextView results = (TextView) activity.findViewById(R.id.results_text_view);
pressMeButton.performClick();
String resultsText = results.getText().toString();
assertThat(resultsText, equalTo("Testing Android Rocks!"));
}
}

20. Demo
Demo with KIF (Keep It Functional)

21. Questions

22. Resources
● Test Driven Development on iOS / Graham Lee
● www.raywenderlich.com
● http://developer.android.com
● http://developer.apple.com
Thanks ...