segues的自动化测试

Question

我想创建一个集成测试，它显示某个动作导致显示一个模态视图控制器。故事板设置了2个视图控制器，其中一个具有自定义ViewController类，第二个具有默认的UIViewController类和标题“second”。 segue设置为模态，标识符为“modalsegue”。在模拟器中运行应用程序效果出色，但我在定义正确的测试时遇到了很多问题。

ViewController.m：

@implementation ViewController 

- (IBAction)handleActionByPerformingModalSegue { 
    [self performSegueWithIdentifier:@"modalsegue" sender:self]; 
} 
@end 

测试：

- (void)testActionCausesDisplayOfSecondViewController { 
    ViewController * vc = 
     [[UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil] 
      instantiateViewControllerWithIdentifier:@"ViewController"]; 

    [vc handleActionByPerformingModalSegue]; 
    STAssertEquals(vc.presentedViewController.title, @"second", 
     @"Title of presented view controller should be second but is %@", 
     vc.presentedViewController.title, nil); 
} 

运行下面的输出测试结果：

2013-06-23 17:38:44.164 SeguesRUs[15291:c07] Warning: Attempt to present <UIViewController: 0x7561370> on <ViewController: 0x7566590> whose view is not in the window hierarchy! 
SeguesRUsTests.m:33: error: -[SeguesRUsTests testActionCausesDisplayOfSecondViewController] : '<00000000>' should be equal to '<9c210d07>': Title of presented view controller should be second but is (null) 

我在做什么错？有没有简单的方法来避免第一条消息？

Answer 1

这是我做的。 假设我已经连接了手动触发的Segue（DocumentsDetailVC）的DocumentsVC。 下面是我的设置，然后我测试1.存在的segue，然后2.我强制视图控制器（在我的情况下，我张贴通知）触发其performSegueWithIdentifier并拦截prepareForSegue方法，看看是否一切为新的视图控制器（DocumentsDetailVC）被设置。这包括方法swizzling。

我没有说我使用OCHamcrest/OCMockito进行单元测试，并且所有我的segues都是以“Segue”（[self appDelegate] segueIdentifierForClass：[SomeClass class]]）添加的目标视图控制器命名的。

- (void)setUp 
{ 
    [super setUp]; 

    _isPad = UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad; 

    realPrepareForSegue = @selector(prepareForSegue:sender:); 
    testPrepareForSegue = @selector(documentsBrowserTest_prepareForSegue:sender:); 

    UIStoryboard *storyboard = nil; 
    if (_isPad) { 
    storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard_iPhone" bundle:nil]; 
    } 
    else { 
    storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard_iPad" bundle:nil]; 
    } 
    UINavigationController *navController = [storyboard instantiateInitialViewController]; 
    self.sut = (DocumentsBrowserVC *)navController.topViewController; 
    [self.sut view]; 
} 


- (void)test_DocumentsDetailsVCSegueConnected 
{ 
    if (_isPad == FALSE) { 
    STAssertNoThrow([self.sut performSegueWithIdentifier:[[self appDelegate] segueIdentifierForClass:[DocumentsDetailVC class]] sender:self], @"DocumentsDetailVC should be connected"); 
    } 
} 


- (void)test_providerDidSelectPathLevelObject_triggersDocumentsDetailsVCSegueSectionIdFile 
{ 
    [DocumentsBrowserTest swapInstanceMethodsForClass:[DocumentsBrowserVC class] 
               selector:realPrepareForSegue 
              andSelector:testPrepareForSegue]; 

    [[NSNotificationCenter defaultCenter] addObserver:self.sut selector:@selector(providerDidSelectPathLevelObject:) name:ProviderDidSelectPathLevelObjectNotification object:nil]; 

    // when  
PathLevelObject *plo = self.pathLevelObjects[SectionIdFile][4]; 
NSDictionary *userInfo = @{OBJECT_KEY : plo , BROWSER_AREA_KEY : @(DocumentsFolder)}; 
[[NSNotificationCenter defaultCenter] postNotificationName:ProviderDidSelectPathLevelObjectNotification object:nil userInfo:userInfo]; 

    // then 
    if (_isPad == FALSE) { 
    assertThat(NSStringFromClass([objc_getAssociatedObject(self.sut, storyboardSegueKey) class]), is(equalTo(@"UIStoryboardPushSegue"))); 
    assertThatBool([[objc_getAssociatedObject(self.sut, storyboardSegueKey) destinationViewController] isKindOfClass:[DocumentsDetailVC class]], is(equalToBool(TRUE))); 
    assertThat(objc_getAssociatedObject(self.sut, senderKey), is(equalTo(self.sut))); 
    } 
    else { 
    assertThatInteger(self.sut.detailViewController.browsingArea, is(equalToInteger(DocumentsFolder))); 
    assertThat(self.sut.detailViewController.pathLevelObject, is(equalTo(plo))); 
    } 


    [[NSNotificationCenter defaultCenter] removeObserver:self.sut]; 

    [DocumentsBrowserTest swapInstanceMethodsForClass:[DocumentsBrowserVC class] 
               selector:realPrepareForSegue 
              andSelector:testPrepareForSegue]; 
} 

Answer 2

随着错误消息指出，问题是，你要出现在一个UIViewController，其观点是不是在UIWindow层次。

最简单的方法来解决它：

- (void)testExample { 

    // 
    // Arrange 
    // Storyboard 
    // 
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil]; 

    // 
    // Arrange 
    // View Controller 
    // 
    UIViewController *viewController = [storyboard instantiateViewControllerWithIdentifier:@"ViewController"]; 
    [UIApplication sharedApplication].keyWindow.rootViewController = viewController; 

    // 
    // Act 
    // 
    [viewController performSegueWithIdentifier:@"ModalSegue" sender:nil]; 

    // 
    // Assert 
    // 
    XCTAssertEqualObjects(viewController.presentedViewController.title, @"Second"); 

}