The document discusses taking a test drive of a new product from Fuzzy Aliens Limited. It includes the author's name and company but does not provide any other relevant details.

1. TAKING A TEST DRIVE
Graham Lee, Fuzzy Aliens Limited
fuzzyaliens.com

2. TAKING A TEST DRIVE
Graham Lee, Fuzzy Aliens Limited

4. Pants Pants
✘ ✔ ✘
Trousers

5. PREVIOUSLY ON VTM…
STAssertTrue(thisThing.state == NSOnState, @”Is this thing on?”);

6. PREVIOUSLY ON VTM…
STAssertTrue(thisThing.state == NSOnState, @”Is this thing on?”);

7. PREVIOUSLY ON VTM…
STAssertTrue(thisThing.state == NSOnState, @”Is this thing on?”);
@ddribin

8. Episode 1 Summary
Software should satisfy the users’ needs
Testing demonstrates that this is true
Unit testing can be done by the developer
Cheap
Well-situated
Test-Driven Development is a design practice

9. This week, on VTM…
- (void)testBlah {
STAssertTrue(thisThing.state == NSOnState,
@”Is this thing on?”);
}

10. This week, on VTM…
OC_TEST_CASE(“General/IsOn”, “Is this thing on?”) {
REQUIRE(thisThing.state == NSOnState);
}
https://github.com/philsquared/Catch
@phil_nash

11. Rule 0

12. Rule 0
Model-View-Controller

13. Recipe: IBOutlets
- (void)viewDidLoad {
NSAssert(myOutlet != nil);
//...
}

14. Recipe: IBOutlets
- (void)setUp {
ctrl = [[MyViewController alloc] initWithNibName: nil bundle: nil];
label = [[UILabel alloc] init];
label.text = @"Label";
ctrl.label = label;
}
OC_TEST_CASE(“MyViewController/SetText”, “Text should be updated”) {
[ctrl setText];
REQUIRE([label.text isEqualToString: @"Set"]);
}
- (void)tearDown {
[ctrl release];
[label release];
}

15. Recipe: IBActions
- (IBAction)doSomething;
- (IBAction)doSomething: (id)sender;
- (IBAction)doSomething: (id)sender forEvent: (UIEvent *)event;

16. Recipe: Core Data

17. Recipe: Core Data
Rule 1 of testing Core Data:

18. Recipe: Core Data
Rule 1 of testing Core Data:
don’t talk about Core Data

19. Recipe: Core Data

20. Recipe: Core Data

21. Recipe: Core Data
- (IBAction)addStaff: (id)sender {
NSManagedObject *employee = [[NSManagedObject alloc]
initWithEntity: employeeEntity
insertIntoManagedObjectContext: moc];
employee.lastName = @"Smith";
}
- (IBAction)addStaff: (id)sender {
id <Employee> employee = [self.employeeBuilder newEmployee];
employee.lastName = @"Smith";
}

22. Aside: Builder

23. Recipe: Core Data

24. Recipe: Core Data
Rule 2 of testing Core Data:

25. Recipe: Core Data
Rule 2 of testing Core Data:
don’t use a database

26. A test is not a unit test if:
It talks to the database Michael Feathers, idealized unit
test
It communicates across the network
It touches the file system
It can't run at the same time as any of your other unit tests
You have to do special things to your environment

27. Recipe: Core Data
@interface TheTest : NSObject <OcFixture> {
@private
NSPersistentStoreCoordinator *coord;
NSManagedObjectContext *ctx;
NSManagedObjectModel *model;
NSPersistentStore *store;
}
@end

28. Recipe: Core Data
@implementation TheTest
- (void)setUp {
model = [[NSManagedObjectModel mergedModelFromBundles: nil] retain];
coord = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel: model];
store = [coord addPersistentStoreWithType: NSInMemoryStoreType
configuration: nil
URL: nil
options: nil
error: NULL];
ctx = [[NSManagedObjectContext alloc] init];
[ctx setPersistentStoreCoordinator: coord];
}
- (void)tearDown {
[ctx release];
ctx = nil;
[coord removePersistentStore: store error: NULL];
store = nil;
[coord release];
coord = nil;
[model release];
model = nil;
}
OC_TEST_CASE("CoreData/Store", "Ensure the persistent store was set up.") {
REQUIRE(store != nil);
}
@end

29. Recipe: Core Data
@implementation TheTest
- (void)setUp {
model = [[NSManagedObjectModel mergedModelFromBundles: nil] retain];
coord = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel: model];
store = [coord addPersistentStoreWithType: NSInMemoryStoreType
configuration: nil
URL: nil
options: nil
error: NULL];
ctx = [[NSManagedObjectContext alloc] init];
[ctx setPersistentStoreCoordinator: coord];
}
- (void)tearDown {
[ctx release];
ctx = nil;
[coord removePersistentStore: store error: NULL];
store = nil;
[coord release];
coord = nil;
[model release];
model = nil;
}
OC_TEST_CASE("CoreData/Store", "Ensure the persistent store was set up.") {
REQUIRE(store != nil);
}
@end

30. Recipe: Core Data
@implementation TheTest
- (void)setUp {
model = [[NSManagedObjectModel mergedModelFromBundles: nil] retain];
coord = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel: model];
store = [coord addPersistentStoreWithType: NSInMemoryStoreType
configuration: nil
URL: nil
options: nil
error: NULL];
ctx = [[NSManagedObjectContext alloc] init];
[ctx setPersistentStoreCoordinator: coord];
}
- (void)tearDown {
[ctx release];
ctx = nil;
[coord removePersistentStore: store error: NULL];
store = nil;
[coord release];
coord = nil;
[model release];
model = nil;
}
OC_TEST_CASE("CoreData/Store", "Ensure the persistent store was set up.") {
REQUIRE(store != nil);
}
@end

31. Recipe: Core Data
@implementation TheTest
- (void)setUp {
model = [[NSManagedObjectModel mergedModelFromBundles: nil] retain];
coord = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel: model];
store = [coord addPersistentStoreWithType: NSInMemoryStoreType
configuration: nil
URL: nil
options: nil
error: NULL];
ctx = [[NSManagedObjectContext alloc] init];
[ctx setPersistentStoreCoordinator: coord];
}
- (void)tearDown {
[ctx release];
ctx = nil;
[coord removePersistentStore: store error: NULL];
store = nil;
[coord release];
coord = nil;
[model release];
model = nil;
}
OC_TEST_CASE("CoreData/Store", "Ensure the persistent store was set up.") {
REQUIRE(store != nil);
}
@end

32. Recipe: Core Data
@implementation TheTest
- (void)setUp {
model = [[NSManagedObjectModel mergedModelFromBundles: nil] retain];
coord = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel: model];
store = [coord addPersistentStoreWithType: NSInMemoryStoreType
configuration: nil
URL: nil
options: nil
error: NULL];
ctx = [[NSManagedObjectContext alloc] init];
[ctx setPersistentStoreCoordinator: coord];
}
- (void)tearDown {
[ctx release];
ctx = nil;
[coord removePersistentStore: store error: NULL];
store = nil;
[coord release];
coord = nil;
[model release];
model = nil;
}
OC_TEST_CASE("CoreData/Store", "Ensure the persistent store was set up.") {
REQUIRE(store != nil);
}
@end

33. Recipe: NSNotificationCenter
Actually talking about Singletons in general
Rule #1 of Singletons is don’t use Singletons
Cocoa Touch doesn’t give us much choice

34. Recipe: NSNotificationCenter
Actually talking about Singletons in general
Rule #1 of Singletons is don’t use Singletons
Cocoa Touch doesn’t give us much choice
Remember, a singleton is a global in sheep’s clothing.

35. Recipe: NSNotificationCenter
- (void)watchForThingsHappening {
[[NSNotificationCenter defaultCenter]
addObserver: self
selector: @selector(workDidFinish:)
name: WorkDidFinishNotification
object: worker];
}
OC_TEST_CASE("ViewController/WorkerFinished", "Ensure we
know when the work's done") {
[controller watchForThingsHappening];
REQUIRE(/*???*/);
}

36. Recipe: NSNotificationCenter
- (void)watchForThingsHappening: (NSNotificationCenter *)center {
[center addObserver: self
selector: @selector(workDidFinish:)
name: WorkDidFinishNotification
object: worker];
}
OC_TEST_CASE("ViewController/WorkerFinished", "Ensure we know when
the work's done") {
[controller watchForThingsHappening: mockNotificationCenter];
REQUIRE([mockNotificationCenter hasObserver: controller
forNotificationNamed:
WorkDidFinishNotification]);
}

37. Conclusions

38. Conclusions
TDD implies a particular approach to writing APIs

39. Conclusions
TDD implies a particular approach to writing APIs
Certain patterns support this approach way

40. Conclusions
TDD implies a particular approach to writing APIs
Certain patterns support this approach way
The patterns you’ve seen today work well with TDD and with the
Cocoa Touch SDK

41. THANKS!
http://blog.securemacprogramming.com/
@iamleeg