使用Cedar测试presentViewController的存在

Question

当我自动点击表格行单元格时，我正在尝试测试是否存在呈现的视图控制器。当我尝试测试控制器的presentViewController是否属于给定类型的类时，它总是导致nil。我假设新呈现的视图控制器正在转换到正在呈现的视图控制器，这就是[controller presentViewController]为零的原因。

我正在使用Cedar BDD测试框架。我已经安装了PivotalCore库来提供自动“点击”功能。

这是规范代码：

#import <Cedar-iOS/Cedar-iOS.h>
#import "UITableViewCell+Spec.h"

#import "FMNavigatorViewController.h"

using namespace Cedar::Matchers;
using namespace Cedar::Doubles;

SPEC_BEGIN(FMNavigatorViewControllerSpec)

describe(@"FMNavigatorViewController", ^{
    __block UINavigationController *nav;
    __block FMNavigatorViewController *controller;

    beforeEach(^{
        FSHandle *documents = [FSHandle handleAtUrl:[[BasicFileManager sharedManager] documentsUrl] isDirectory:YES];
        // @todo Remove all files from Recent Files and Local Files.
        // Remove all configured remote connections.
        NSArray *contents = [[BasicFileManager sharedManager] contentsOfDirectoryAtURL:documents.url];
        for (NSURL *url in contents) {
            if (! [url.lastPathComponent isEqualToString:@"Local Files"] && ! [url.lastPathComponent isEqualToString:@"Recent Files"]) {
                NSLog(@"WARNING: Deleting Manager: %@", url.lastPathComponent);
                FileManager *manager = [FileManager fileManagerWithName:url.lastPathComponent];
                [manager deleteFileManager];
            }
        }
        // Create view.
        controller = [[FMNavigatorViewController alloc] initWithDirectory:documents];
        nav = [[UINavigationController alloc] initWithRootViewController:controller];
        // Initiates view lifecycle. Accessing the 'view' will automatically
        // create it.
        nav.view should_not be_nil;
        // Doesn't get called unless properly added to a heirarchy -- which I
        // haven't found the correct process for yet.
        [controller viewWillAppear:NO];
    });

    it(@"should contain Local and Recent Files with no other connections", ^{
        controller should be_instance_of([FMNavigatorViewController class]);
        // Local and Remote Connection Groups
        [controller.tableView.dataSource numberOfSectionsInTableView:controller.tableView] should equal(2);
        // Recent Files and Local Files
        [controller.tableView.dataSource tableView:controller.tableView numberOfRowsInSection:0] should equal(2);
        // Enforce order: Local Files then Recent Files.
        [[[controller.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0]] textLabel] text] should equal(@"Local Files");
        [[[controller.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:1 inSection:0]] textLabel] text] should equal(@"Recent Files");
        // The second group should have one row with description.
        [controller.tableView.dataSource tableView:controller.tableView numberOfRowsInSection:1] should equal(1);
        [[[controller.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:1]] textLabel] text] should equal(NSLocalizedString(@"CreateRemoteConnection", @""));
    });

    it(@"should display the FM wizard view", ^{
        [[controller.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:1]] tap];
        controller.presentedViewController should_not be_nil;
        //[nav presentedViewController] should be_instance_of([UINavigationController class]);
        //[controller presentedViewController] should be_instance_of([UINavigationController class]);
    });

});

SPEC_END

最后一次测试包含有问题的代码。我的问题是：如果presentViewController不是nil，我需要等待一两秒才能测试吗？如果是这样，我该怎么做？

以下是点击单元格后应执行的代码：

FMWizardViewController *controller = [FMWizardViewController new];
[controller setDelegate:self];
UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:controller];
nav.navigationBar.tintColor = UIColorFromRGB(BNAV_TINT_COLOR);
[self presentViewController:nav animated:YES completion:nil];

我仔细检查以确保在点击单元格后实际运行此代码;确实如此。

谢谢！

Answer 1

在Google雪松讨论组（https://groups.google.com/forum/#!forum/cedar-discuss）的帮助下，我能够弄明白。

需要做的是：

1. 主要的运行循环需要先进行，以便实现呈现的ViewController并将其关联到相应的视图控制器
2. 需要创建整个视图层次结构（窗口，导航控制器，FMNavigationController）

#import <Cedar-iOS/Cedar-iOS.h>

#import "UITableViewCell+Spec.h"

#import "FMNavigatorViewController.h"

// << -- Add this
#define tickRunLoop (CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0.01, false))

using namespace Cedar::Matchers;
using namespace Cedar::Doubles;

SPEC_BEGIN(FMNavigatorViewControllerSpec)

describe(@"FMNavigatorViewController", ^{
    __block UIWindow *window; // <<-- and this,
    __block UINavigationController *nav;
    __block FMNavigatorViewController *controller;

    beforeEach(^{
        window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
        FSHandle *documents = [FSHandle handleAtUrl:[[BasicFileManager sharedManager] documentsUrl] isDirectory:YES];
        // @todo Remove all files from Recent Files and Local Files.
        // Remove all configured remote connections.
        NSArray *contents = [[BasicFileManager sharedManager] contentsOfDirectoryAtURL:documents.url];
        for (NSURL *url in contents) {
            if (! [url.lastPathComponent isEqualToString:@"Local Files"] && ! [url.lastPathComponent isEqualToString:@"Recent Files"]) {
                NSLog(@"WARNING: Deleting Manager: %@", url.lastPathComponent);
                FileManager *manager = [FileManager fileManagerWithName:url.lastPathComponent];
                [manager deleteFileManager];
            }
        }
        // Create view.
        controller = [[FMNavigatorViewController alloc] initWithDirectory:documents];
        nav = [[UINavigationController alloc] initWithRootViewController:controller];
        window.rootViewController = nav;
        [window makeKeyAndVisible];
        // Initiates view lifecycle. Accessing the 'view' will automatically
        // create it.
        nav.view should_not be_nil;
        // Doesn't get called unless properly added to a heirarchy -- which I
        // haven't found the correct process for yet.
        [controller viewWillAppear:NO];
    });

    it(@"should contain Local and Recent Files with no other connections", ^{
        controller should be_instance_of([FMNavigatorViewController class]);
        // Local and Remote Connection Groups
        [controller.tableView.dataSource numberOfSectionsInTableView:controller.tableView] should equal(2);
        // Recent Files and Local Files
        [controller.tableView.dataSource tableView:controller.tableView numberOfRowsInSection:0] should equal(2);
        // Enforce order: Local Files then Recent Files.
        [[[controller.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0]] textLabel] text] should equal(@"Local Files");
        [[[controller.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:1 inSection:0]] textLabel] text] should equal(@"Recent Files");
        // The second group should have one row with description.
        [controller.tableView.dataSource tableView:controller.tableView numberOfRowsInSection:1] should equal(1);
        [[[controller.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:1]] textLabel] text] should equal(NSLocalizedString(@"CreateRemoteConnection", @""));
    });

    it(@"should display the FM wizard view", ^{
        // Sanity to ensure we are tapping the right cell.
        [[controller.tableView.visibleCells[2] textLabel] text] should equal(NSLocalizedString(@"CreateRemoteConnection", @""));
        [controller.tableView.visibleCells[2] tap];
        tickRunLoop; // <<-- and this.
        controller.presentedViewController should_not be_nil;
        controller.presentedViewController should be_instance_of([UINavigationController class]);
    });

});

SPEC_END

现在所有测试都通过了。

其中一位维护者表示，这个问题很可能与iOS 8中的一些内部变化有关;只要presentViewController：animated：completion：被调用，它就不会将presentViewController值关联起来。它应该在将来解决。

我希望这有助于某人！

更新

我忘了补充一点，推进运行循环不是最佳做法。在问题得到解决之前，这应被视为止损。