Unit Testing: Special Cases
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The document discusses unit testing for UIViewControllers, focusing on testing specific aspects like IBOutlet connections, action bindings, and proper method calls during lifecycle events like viewDidLoad and dealloc. It covers strategies for testing block-based code and Core Data models, emphasizing the need for a structured approach and avoiding business logic in model classes. It also includes links to additional resources for further reading on unit testing in iOS development.
![- (void)setUp {
[super setUp];
sut = [ConverterViewController new];
}
!
- (void)tearDown {
sut = nil;
[super tearDown];
}
Is Outlet Connected?](https://image.slidesharecdn.com/ut-specialcases-140926081710-phpapp01/85/Unit-Testing-Special-Cases-9-320.jpg)
![- (void)setUp {
[super setUp];
sut = [ConverterViewController new];
}
!
- (void)tearDown {
sut = nil;
[super tearDown];
}
!
- (void)testThatTextFieldOutletIsConnected {
XCTAssertNotNil(sut.textField, @"outlet should be connected");
}
Is Outlet Connected?](https://image.slidesharecdn.com/ut-specialcases-140926081710-phpapp01/85/Unit-Testing-Special-Cases-10-320.jpg)
![- (void)setUp {
[super setUp];
sut = [ConverterViewController new];
}
!
- (void)tearDown {
sut = nil;
[super tearDown];
}
!
- (void)testThatTextFieldOutletIsConnected {
XCTAssertNotNil(sut.textField, @"outlet should be connected");
}
Is Outlet Connected?](https://image.slidesharecdn.com/ut-specialcases-140926081710-phpapp01/85/Unit-Testing-Special-Cases-11-320.jpg)
![- (void)setUp {
[super setUp];
sut = [ConverterViewController new];
}
!
- (void)tearDown {
sut = nil;
[super tearDown];
}
!
- (void)testThatTextFieldOutletIsConnected {
[sut view];
XCTAssertNotNil(sut.textField, @"outlet should be connected");
}
Is Outlet Connected?](https://image.slidesharecdn.com/ut-specialcases-140926081710-phpapp01/85/Unit-Testing-Special-Cases-12-320.jpg)
![- (void)testButtonActionBinding {
[sut view];
NSArray* acts =
[sut.button actionsForTarget:sut
forControlEvent:UIControlEventTouchUpInside];
XCTAssert([acts containsObject:@"onButton:"], @"should use
correct action");
}
Is Action Connected?](https://image.slidesharecdn.com/ut-specialcases-140926081710-phpapp01/85/Unit-Testing-Special-Cases-14-320.jpg)
![@interface ConverterViewControllerTests : XCTestCase {
ConverterViewController* sut;
BOOL _sutDeallocated;
}
@end
!
- (void)setUp {
[super setUp];
sut = [ConverterViewController new];
_sutDeallocated = NO;
[sut aspect_hookSelector:NSSelectorFromString(@"dealloc")
withOptions:AspectPositionBefore
usingBlock:^(id<AspectInfo> aspectInfo){
_sutDeallocated = YES;
} error:nil];
}
!
- (void)tearDown {
sut = nil;
XCTAssertTrue(_sutDeallocated, @"SUT is not deallocated");
[super tearDown];
}
dealloc](https://image.slidesharecdn.com/ut-specialcases-140926081710-phpapp01/85/Unit-Testing-Special-Cases-30-320.jpg)
![@interface
}
@end
!
- (
[
!
!
!
!
!
}
!
- (
[
}
dealloc
!
!
!
!
!
!
!
!
!
!
[sut aspect_hookSelector:NSSelectorFromString(@"dealloc")
withOptions:AspectPositionBefore
usingBlock:^(id<AspectInfo> aspectInfo){
_sutDeallocated = YES;
} error:nil];](https://image.slidesharecdn.com/ut-specialcases-140926081710-phpapp01/85/Unit-Testing-Special-Cases-31-320.jpg)
![-(void)testTappingDetailsShouldDisplayDetails {
UINavigationController *nav = [[UINavigationController alloc]
initWithRootViewController:sut];
id mockNav = [OCMockObject partialMockForObject:nav];
[[mockNav expect] pushViewController:[OCMArg any]
animated:YES];
[sut onShowDetailsButton:nil];
[mockNav verify];
}
UINavigationController](https://image.slidesharecdn.com/ut-specialcases-140926081710-phpapp01/85/Unit-Testing-Special-Cases-36-320.jpg)
![- (void)testRunAsyncCode {
// arrange
__block BOOL hasCalledBack = NO;
!
// act
[sut runAsyncCode:^(NSArray *result) {
hasCalledBack = YES;
}];
// assert
XCTAssert(hasCalledBack, @"Test timed out");
}
Block-based code](https://image.slidesharecdn.com/ut-specialcases-140926081710-phpapp01/85/Unit-Testing-Special-Cases-41-320.jpg)
![- (void)testRunAsyncCode {
// arrange
__block BOOL hasCalledBack = NO;
!
// act
[sut runAsyncCode:^(NSArray *result) {
hasCalledBack = YES;
}];
// assert
XCTAssert(hasCalledBack, @"Test timed out");
}
Block-based code](https://image.slidesharecdn.com/ut-specialcases-140926081710-phpapp01/85/Unit-Testing-Special-Cases-42-320.jpg)
![- (void)testRunAsyncCode {
// arrange
__block BOOL hasCalledBack = NO;
!
// act
[sut runAsyncCode:^(NSArray *result) {
hasCalledBack = YES;
}];
// assert
XCTAssert(hasCalledBack, @"Test timed out");
}
Block-based code](https://image.slidesharecdn.com/ut-specialcases-140926081710-phpapp01/85/Unit-Testing-Special-Cases-43-320.jpg)
![- (void)testRunAsyncCode {
// arrange
__block BOOL hasCalledBack = NO;
!
// act
[sut runAsyncCode:^(NSArray *result) {
hasCalledBack = YES;
}];
// assert
XCTAssert(hasCalledBack, @"Test timed out");
}
Block-based code](https://image.slidesharecdn.com/ut-specialcases-140926081710-phpapp01/85/Unit-Testing-Special-Cases-44-320.jpg)
![- (void)testRunAsyncCode {
// arrange
__block BOOL hasCalledBack = NO;
!
// act
[sut runAsyncCode:^(NSArray *result) {
hasCalledBack = YES;
}];
// assert
XCTAssert(hasCalledBack, @"Test timed out");
}
Block-based code](https://image.slidesharecdn.com/ut-specialcases-140926081710-phpapp01/85/Unit-Testing-Special-Cases-45-320.jpg)
![- (void)testRunAsyncCode {
// arrange
__block BOOL hasCalledBack = NO;
!
// act
[sut runAsyncCode:^(NSArray *result) {
hasCalledBack = YES;
}];
// assert
XCTAssert(hasCalledBack, @"Test timed out");
}
Block-based code](https://image.slidesharecdn.com/ut-specialcases-140926081710-phpapp01/85/Unit-Testing-Special-Cases-46-320.jpg)
![- (void)testRunAsyncCode {
// arrange
__block BOOL hasCalledBack = NO;
!
// act
[sut runAsyncCode:^(NSArray *result) {
hasCalledBack = YES;
}];
// assert
XCTAssert(hasCalledBack, @"Test timed out");
}
Block-based code](https://image.slidesharecdn.com/ut-specialcases-140926081710-phpapp01/85/Unit-Testing-Special-Cases-49-320.jpg)
![- (void)testRunAsyncCode {
// arrange
__block BOOL hasCalledBack = NO;
!
// act
[sut runAsyncCode:^(NSArray *result) {
hasCalledBack = YES;
}];
// assert
!
!
!
!
!
XCTAssert(hasCalledBack, @"Test timed out");
}
Block-based code](https://image.slidesharecdn.com/ut-specialcases-140926081710-phpapp01/85/Unit-Testing-Special-Cases-50-320.jpg)
![- (void)testRunAsyncCode {
// arrange
__block BOOL hasCalledBack = NO;
!
// act
[sut runAsyncCode:^(NSArray *result) {
hasCalledBack = YES;
}];
// assert
NSDate *timeout = [NSDate dateWithTimeIntervalSinceNow:0.1];
while([timeout timeIntervalSinceNow] > 0 && hasCalledBack == NO) {
[[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode
beforeDate:timeout];
}
XCTAssert(hasCalledBack, @"Test timed out");
}
Block-based code](https://image.slidesharecdn.com/ut-specialcases-140926081710-phpapp01/85/Unit-Testing-Special-Cases-51-320.jpg)
![- (void)testRunAsyncCode {
// arrange
__block BOOL hasCalledBack = NO;
!
// act
[sut runAsyncCode:^(NSArray *result) {
hasCalledBack = YES;
}];
// assert
NSDate *timeout = [NSDate dateWithTimeIntervalSinceNow:0.1];
while([timeout timeIntervalSinceNow] > 0 && hasCalledBack == NO) {
[[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode
beforeDate:timeout];
}
XCTAssert(hasCalledBack, @"Test timed out");
}
Block-based code](https://image.slidesharecdn.com/ut-specialcases-140926081710-phpapp01/85/Unit-Testing-Special-Cases-52-320.jpg)
![Block-based code
Also we can use:
- (void)verifyWithDelay:(NSTimeInterval)delay
{
NSTimeInterval step = 0.01;
while(delay > 0)
{
if([expectations count] == 0)
break;
NSDate* until = [NSDate dateWithTimeIntervalSinceNow:step];
[[NSRunLoop currentRunLoop] runUntilDate:until];
delay -= step;
step *= 2;
}
[self verify];
}
OCMock](https://image.slidesharecdn.com/ut-specialcases-140926081710-phpapp01/85/Unit-Testing-Special-Cases-53-320.jpg)
![- (void)setUp
{
[super setUp];
NSURL *modelURL = [[NSBundle mainBundle] URLForResource:@"SimpleInvoice"
withExtension:@“momd"];
!
NSManagedObjectModel *mom = [[NSManagedObjectModel alloc]
initWithContentsOfURL:modelURL];
!
NSPersistentStoreCoordinator *psc = [[NSPersistentStoreCoordinator alloc]
initWithManagedObjectModel:mom];
!
XCTAssertNotNil([psc addPersistentStoreWithType:NSInMemoryStoreType
configuration:nil
URL:nil
options:nil
error:NULL], @"Should be able to
add in-memory store”);
!
_moc = [[NSManagedObjectContext alloc] init];
_moc.persistentStoreCoordinator = psc;
}
CoreData](https://image.slidesharecdn.com/ut-specialcases-140926081710-phpapp01/85/Unit-Testing-Special-Cases-66-320.jpg)
![- (void
{
[
!
initWithContentsOfURL
!
initWithManagedObjectModel
!
!
!
!
!
!
!
!
}
CoreData
- (void)setUp
{
!
!
!
!
!
!
!
!
!
!
XCTAssertNotNil([psc addPersistentStoreWithType:NSInMemoryStoreType
configuration:nil
URL:nil
options:nil
error:NULL], @"Should be able to
add in-memory store”);
!
!
!
}](https://image.slidesharecdn.com/ut-specialcases-140926081710-phpapp01/85/Unit-Testing-Special-Cases-67-320.jpg)
![- (void)testFullNameReturnsСorrectString {
Person* ps;
ps = [NSEntityDescription insertNewObjectForEntityForName:@"Person"
inManagedObjectContext:_moc];
ps.firstName = @"Tom";
ps.lastName = @“Lol";
!
STAssertTrue([[ps fullName] isEqualToString:@"Lol Tom"],
@"should have matched full name");
}
CoreData](https://image.slidesharecdn.com/ut-specialcases-140926081710-phpapp01/85/Unit-Testing-Special-Cases-74-320.jpg)
Unit Testing: Special Cases
- 2. How to Test
- 3. UIViewControllers How to TestUnit Testing What Is Testing For?
- 4. UIViewControllers Block-based code ! How to TestUnit Testing What Is Testing For?
- 5. UIViewControllers Block-based code CoreData How to TestUnit Testing What Is Testing For?
- 8. IBOutlets & IBActions Outlet is connected
- 9. - (void)setUp { [super setUp]; sut = [ConverterViewController new]; } ! - (void)tearDown { sut = nil; [super tearDown]; } Is Outlet Connected?
- 10. - (void)setUp { [super setUp]; sut = [ConverterViewController new]; } ! - (void)tearDown { sut = nil; [super tearDown]; } ! - (void)testThatTextFieldOutletIsConnected { XCTAssertNotNil(sut.textField, @"outlet should be connected"); } Is Outlet Connected?
- 11. - (void)setUp { [super setUp]; sut = [ConverterViewController new]; } ! - (void)tearDown { sut = nil; [super tearDown]; } ! - (void)testThatTextFieldOutletIsConnected { XCTAssertNotNil(sut.textField, @"outlet should be connected"); } Is Outlet Connected?
- 12. - (void)setUp { [super setUp]; sut = [ConverterViewController new]; } ! - (void)tearDown { sut = nil; [super tearDown]; } ! - (void)testThatTextFieldOutletIsConnected { [sut view]; XCTAssertNotNil(sut.textField, @"outlet should be connected"); } Is Outlet Connected?
- 13. IBOutlets & IBActions Outlet has a right action.
- 14. - (void)testButtonActionBinding { [sut view]; NSArray* acts = [sut.button actionsForTarget:sut forControlEvent:UIControlEventTouchUpInside]; XCTAssert([acts containsObject:@"onButton:"], @"should use correct action"); } Is Action Connected?
- 15. IBOutlets & IBActions The action does the right things.
- 16. viewDidLoad Unit testing of a view controller nearly always means writing the view controller methods differently
- 17. viewDidLoad - should call helper methods
- 18. viewDidLoad - should call helper methods - each of the helper methods should do just one thing (SOLID principles)
- 19. viewDidLoad - should call helper methods - each of the helper methods should do just one thing (SOLID principles) - write tests for each of the helper methods
- 20. viewDidLoad - should call helper methods - each of the helper methods should do just one thing (SOLID principles) - write tests for each of the helper methods - test viewDidLoad calls helper methods (partial mock)
- 22. dealloc ❓hook dealloc method of SUT when setup
- 23. dealloc ❓hook dealloc method of SUT when setup ❓record calling of the hook
- 24. dealloc ❓hook dealloc method of SUT when setup ❓record calling of the hook ❓verify if hook is called after teardown
- 25. Aspects
- 26. /// Adds a block of code before/instead/after the current `selector` for a specific instance. - (id<AspectToken>)aspect_hookSelector:(SEL)selector withOptions:(AspectOptions)options usingBlock:(id)block error:(NSError **)error; ! /// Called after the original implementation (default) AspectPositionAfter, ! /// Will replace the original implementation. AspectPositionInstead, ! /// Called before the original implementation. AspectPositionBefore, Aspects
- 27. dealloc ✅ hook dealloc method of SUT when setup ❓ record calling of the hook ❓ verify if hook is called after teardown Aspects
- 28. dealloc ✅ hook dealloc method of SUT when setup ✅ record calling of the hook ❓ verify if hook is called after teardown Aspects instance var
- 29. dealloc ✅ hook dealloc method of SUT when setup ✅ record calling of the hook ✅ verify if hook is called after teardown Aspects instance var XCTAssert
- 30. @interface ConverterViewControllerTests : XCTestCase { ConverterViewController* sut; BOOL _sutDeallocated; } @end ! - (void)setUp { [super setUp]; sut = [ConverterViewController new]; _sutDeallocated = NO; [sut aspect_hookSelector:NSSelectorFromString(@"dealloc") withOptions:AspectPositionBefore usingBlock:^(id<AspectInfo> aspectInfo){ _sutDeallocated = YES; } error:nil]; } ! - (void)tearDown { sut = nil; XCTAssertTrue(_sutDeallocated, @"SUT is not deallocated"); [super tearDown]; } dealloc
- 31. @interface } @end ! - ( [ ! ! ! ! ! } ! - ( [ } dealloc ! ! ! ! ! ! ! ! ! ! [sut aspect_hookSelector:NSSelectorFromString(@"dealloc") withOptions:AspectPositionBefore usingBlock:^(id<AspectInfo> aspectInfo){ _sutDeallocated = YES; } error:nil];
- 32. UINavigationController - test push view controller - test pop view controller
- 35. UINavigationController But @interface UIViewController (UINavigationControllerItem) ! @property(nonatomic,readonly,retain) UINavigationController* navigationController; ! @end
- 36. -(void)testTappingDetailsShouldDisplayDetails { UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:sut]; id mockNav = [OCMockObject partialMockForObject:nav]; [[mockNav expect] pushViewController:[OCMArg any] animated:YES]; [sut onShowDetailsButton:nil]; [mockNav verify]; } UINavigationController
- 37. Choosing not to test view controllers is the decision not to test most of your code. UIViewController
- 38. Testing simple things is simple, and testing complex things is complex UIViewController
- 39. Block-based code Why does test fail?
- 40. Block-based code ! typedef void(^CompletionHandler)(NSArray * result); ! - (void)runAsyncCode:(CompletionHandler)completion { dispatch_async(dispatch_get_main_queue(), ^{ completion(nil); }); }
- 41. - (void)testRunAsyncCode { // arrange __block BOOL hasCalledBack = NO; ! // act [sut runAsyncCode:^(NSArray *result) { hasCalledBack = YES; }]; // assert XCTAssert(hasCalledBack, @"Test timed out"); } Block-based code
- 42. - (void)testRunAsyncCode { // arrange __block BOOL hasCalledBack = NO; ! // act [sut runAsyncCode:^(NSArray *result) { hasCalledBack = YES; }]; // assert XCTAssert(hasCalledBack, @"Test timed out"); } Block-based code
- 43. - (void)testRunAsyncCode { // arrange __block BOOL hasCalledBack = NO; ! // act [sut runAsyncCode:^(NSArray *result) { hasCalledBack = YES; }]; // assert XCTAssert(hasCalledBack, @"Test timed out"); } Block-based code
- 44. - (void)testRunAsyncCode { // arrange __block BOOL hasCalledBack = NO; ! // act [sut runAsyncCode:^(NSArray *result) { hasCalledBack = YES; }]; // assert XCTAssert(hasCalledBack, @"Test timed out"); } Block-based code
- 45. - (void)testRunAsyncCode { // arrange __block BOOL hasCalledBack = NO; ! // act [sut runAsyncCode:^(NSArray *result) { hasCalledBack = YES; }]; // assert XCTAssert(hasCalledBack, @"Test timed out"); } Block-based code
- 46. - (void)testRunAsyncCode { // arrange __block BOOL hasCalledBack = NO; ! // act [sut runAsyncCode:^(NSArray *result) { hasCalledBack = YES; }]; // assert XCTAssert(hasCalledBack, @"Test timed out"); } Block-based code
- 47. Block-based code What can we do?
- 48. Block-based code
- 49. - (void)testRunAsyncCode { // arrange __block BOOL hasCalledBack = NO; ! // act [sut runAsyncCode:^(NSArray *result) { hasCalledBack = YES; }]; // assert XCTAssert(hasCalledBack, @"Test timed out"); } Block-based code
- 50. - (void)testRunAsyncCode { // arrange __block BOOL hasCalledBack = NO; ! // act [sut runAsyncCode:^(NSArray *result) { hasCalledBack = YES; }]; // assert ! ! ! ! ! XCTAssert(hasCalledBack, @"Test timed out"); } Block-based code
- 51. - (void)testRunAsyncCode { // arrange __block BOOL hasCalledBack = NO; ! // act [sut runAsyncCode:^(NSArray *result) { hasCalledBack = YES; }]; // assert NSDate *timeout = [NSDate dateWithTimeIntervalSinceNow:0.1]; while([timeout timeIntervalSinceNow] > 0 && hasCalledBack == NO) { [[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:timeout]; } XCTAssert(hasCalledBack, @"Test timed out"); } Block-based code
- 52. - (void)testRunAsyncCode { // arrange __block BOOL hasCalledBack = NO; ! // act [sut runAsyncCode:^(NSArray *result) { hasCalledBack = YES; }]; // assert NSDate *timeout = [NSDate dateWithTimeIntervalSinceNow:0.1]; while([timeout timeIntervalSinceNow] > 0 && hasCalledBack == NO) { [[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:timeout]; } XCTAssert(hasCalledBack, @"Test timed out"); } Block-based code
- 53. Block-based code Also we can use: - (void)verifyWithDelay:(NSTimeInterval)delay { NSTimeInterval step = 0.01; while(delay > 0) { if([expectations count] == 0) break; NSDate* until = [NSDate dateWithTimeIntervalSinceNow:step]; [[NSRunLoop currentRunLoop] runUntilDate:until]; delay -= step; step *= 2; } [self verify]; } OCMock
- 54. CoreData
- 55. CoreData As long as you don't put business logic in your models, you don't have to test them.
- 56. CoreData creates setters & getters in run-time
- 57. CoreData creates setters & getters in run-time we can’t mock CoreData models
- 58. CoreData What can we do?
- 59. CoreData - create protocol that has all model’s properties defined
- 60. CoreData - create protocol that has all model’s properties defined - conform NSManagedObject to the protocol
- 61. CoreData - create protocol that has all model’s properties defined - conform NSManagedObject to the protocol - create NSObject model just for testing, conforms to the protocol and @synthesize properties
- 64. CoreData Have a better solution?
- 65. CoreData Create own CoreData stack for each test-case
- 66. - (void)setUp { [super setUp]; NSURL *modelURL = [[NSBundle mainBundle] URLForResource:@"SimpleInvoice" withExtension:@“momd"]; ! NSManagedObjectModel *mom = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL]; ! NSPersistentStoreCoordinator *psc = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:mom]; ! XCTAssertNotNil([psc addPersistentStoreWithType:NSInMemoryStoreType configuration:nil URL:nil options:nil error:NULL], @"Should be able to add in-memory store”); ! _moc = [[NSManagedObjectContext alloc] init]; _moc.persistentStoreCoordinator = psc; } CoreData
- 67. - (void { [ ! initWithContentsOfURL ! initWithManagedObjectModel ! ! ! ! ! ! ! ! } CoreData - (void)setUp { ! ! ! ! ! ! ! ! ! ! XCTAssertNotNil([psc addPersistentStoreWithType:NSInMemoryStoreType configuration:nil URL:nil options:nil error:NULL], @"Should be able to add in-memory store”); ! ! ! }
- 69. CoreData Advantages? - no additional classes
- 70. CoreData Advantages? - no additional classes - no dependence on external state
- 71. CoreData Advantages? - no additional classes - no dependence on external state - close approximation to the application environment
- 72. CoreData Advantages? - no additional classes - no dependence on external state - close approximation to the application environment - we are able to create base test class with a stack and subclass it where we need
- 73. CoreData Advantages? - no additional classes - no dependence on external state - close approximation to the application environment - we are able to create base test class with a stack and subclass it where we need
- 74. - (void)testFullNameReturnsСorrectString { Person* ps; ps = [NSEntityDescription insertNewObjectForEntityForName:@"Person" inManagedObjectContext:_moc]; ps.firstName = @"Tom"; ps.lastName = @“Lol"; ! STAssertTrue([[ps fullName] isEqualToString:@"Lol Tom"], @"should have matched full name"); } CoreData
- 75. CoreData - test model’s additional business-logic - test ManagedObjectModel for an entity - create and use models as a mocks
- 76. ✅ UIViewControllers ✅ Block-based code ✅ CoreData How to Test