Better Testing of View Controllers on iOS: Part 2

2014-10-29T08:00:50-04:00

More adventures in Unit Testing – Better Testing of View Controllers on iOS: Part 2 http://t.co/SsCt5WBzil

2014-10-29T12:07:08-04:00

RT @catehstn: More adventures in Unit Testing – Better Testing of View Controllers on iOS: Part 2 http://t.co/SsCt5WBzil

2014-10-29T14:37:37-04:00

RT @catehstn: More adventures in Unit Testing – Better Testing of View Controllers on iOS: Part 2 http://t.co/SsCt5WBzil

	@class ViewController;

	@interface Presenter : NSObject

	@property(nonatomic, weak) ViewController *viewController;

	– (void)viewLoaded;
	– (NSArray *)leftNavigationButtons;
	– (NSArray *)rightNavigationButtons;

	@end

	#import "Presenter.h"

	@implementation Presenter

	@synthesize viewController = viewController_;

	– (void)viewLoaded {
	// By default, do nothing.
	}

	– (NSArray *)leftNavigationButtons {
	return @[];
	}

	– (NSArray *)rightNavigationButtons {
	return @[];
	}

	@end

	#import <UIKit/UIKit.h>

	@class Presenter;

	@interface ViewController : UIViewController

	@property(readonly, nonatomic) Presenter *presenter;

	// Designated initializer.
	– (id)initWithPresenter:(Presenter *)presenter;

	– (void)dismissViewControllerAnimated:(BOOL)animated
	withCompletionBlock:(void (^)(void))completionBlock;

	@end

	#import "ViewController.h"

	#import "Presenter.h"

	@implementation ViewController {
	Presenter *presenter_;
	}

	@synthesize presenter = presenter_;

	– (id)initWithPresenter:(Presenter *)presenter {
	self = [super init];
	if (self) {
	presenter_ = presenter;
	[presenter setViewController:self];
	}
	return self;
	}

	– (void)viewDidLoad {
	[super viewDidLoad];

	[[self navigationItem] setLeftBarButtonItems:[[self presenter] leftNavigationButtons]
	animated:YES];
	[[self navigationItem] setRightBarButtonItems:[[self presenter] rightNavigationButtons]
	animated:YES];
	[presenter_ viewLoaded];
	}

	– (void)dismissViewControllerAnimated:(BOOL)animated
	withCompletionBlock:(void (^)(void))completionBlock {
	[[self navigationController] dismissViewControllerAnimated:animated
	completion:completionBlock];
	}

	@end

	#import <OCMock/OCMock.h>
	#import <XCTest/XCTest.h>

	#import "Presenter.h"
	#import "ViewController.h"

	@interface PresenterTest : XCTestCase {
	id mockViewController_;
	Presenter *presenter_;
	}
	@end

	@implementation PresenterTest

	– (void)setUp {
	[super setUp];
	mockViewController_ = OCMStrictClassMock([ViewController class]);
	presenter_ = [[Presenter alloc] init];
	[presenter_ setViewController:mockViewController_];
	}

	– (void)tearDown {
	[mockViewController_ verify];
	[super tearDown];
	}

	– (void)testViewLoaded {
	// By default, do nothing.
	[presenter_ viewLoaded];
	}

	– (void)testLeftNavigationButtons {
	// By default, empty.
	XCTAssertEqual(0, [[presenter_ leftNavigationButtons] count]);
	}

	– (void)testRightNavigationButtons {
	// By default, empty.
	XCTAssertEqual(0, [[presenter_ rightNavigationButtons] count]);
	}

	@end

	#import <OCMock/OCMock.h>
	#import <XCTest/XCTest.h>

	#import "Presenter.h"
	#import "ViewController.h"

	@interface ViewControllerTest : XCTestCase {
	id mockPresenter_;
	ViewController *viewController_;
	}
	@end

	@implementation ViewControllerTest

	– (void)setUp {
	[super setUp];
	mockPresenter_ = OCMStrictClassMock([Presenter class]);
	OCMExpect([mockPresenter_ setViewController:OCMOCK_ANY]);
	viewController_ = [[ViewController alloc] initWithPresenter:mockPresenter_];
	}

	– (void)tearDown {
	[mockPresenter_ verify];
	[super tearDown];
	}

	– (void)testInit {
	OCMVerify([mockPresenter_ setViewController:viewController_]);
	}

	– (void)testViewDidLoad {
	OCMExpect([mockPresenter_ leftNavigationButtons]);
	OCMExpect([mockPresenter_ rightNavigationButtons]);
	OCMExpect([mockPresenter_ viewLoaded]);

	[viewController_ viewDidLoad];

	OCMVerify([mockPresenter_ leftNavigationButtons]);
	OCMVerify([mockPresenter_ rightNavigationButtons]);
	OCMVerify([mockPresenter_ viewLoaded]);

	#import "Presenter.h"

	@class HomeViewController;
	@class UIImageHelper;

	@interface HomeViewPresenter :
	Presenter<UIImagePickerControllerDelegate, UINavigationControllerDelegate>

	+ (HomeViewController *)createViewController;

	// Exposed for testing only.
	– (id)initWithImageHelper:(UIImageHelper *)imageHelper;

	@end

	#import "HomeViewPresenter.h"

	#import "HomeView.h"
	#import "HomeViewController.h"
	#import "ImageViewController.h"
	#import "ImageViewPresenter.h"
	#import "UIImageHelper.h"

	@interface HomeViewPresenter () {
	UIImageHelper *imageHelper_;
	}
	@end

	@implementation HomeViewPresenter

	+ (HomeViewController *)createViewController {
	HomeViewPresenter *presenter = [HomeViewPresenter new];
	HomeViewController *viewController = [[HomeViewController alloc] initWithPresenter:presenter];
	return viewController;
	}

	– (id)initWithImageHelper:(UIImageHelper *)imageHelper {
	self = [super init];
	if (self) {
	imageHelper_ = imageHelper;
	}
	return self;
	}

	– (void)viewLoaded {
	HomeView *homeView = [[self homeViewController] homeView];

	if ([imageHelper_ isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
	[[homeView cameraButton] addTarget:self
	action:@selector(cameraButtonSelected:)
	forControlEvents:UIControlEventTouchUpInside];
	} else {
	[[homeView cameraButton] setEnabled:NO];
	}

	#import "ViewController.h"

	@class HomeView;

	@interface HomeViewController : ViewController

	@property(nonatomic, readonly) HomeView *homeView;

	– (void)showImagePickerWithType:(UIImagePickerControllerSourceType)type
	delegate:(id <UINavigationControllerDelegate, UIImagePickerControllerDelegate>)delegate;

	@end

ViewController and Presenter