Xcode UI测试“尝试启动失败”

Question

我是UI测试的新手，正在尝试将该功能集成到现有项目中。我正在尝试最基本的测试，只是看到框架在行动，但我遇到了一些困难。我已经为我的项目添加了一个新的UI Testing Bundle目标，并且能够运行我的基本测试。但是，当我尝试在我的测试中实际启动应用程序时，我总是会遇到“尝试启动失败”错误。它还说明了“当前流程参考的零令牌”。

这是我正在测试的代码：

@implementation SKYPracticeUITesting

- (void)setUp {
    [super setUp];

    // Put setup code here. This method is called before the invocation of each test method in the class.

    // In UI tests it is usually best to stop immediately when a failure occurs.
    self.continueAfterFailure = NO;
    // UI tests must launch the application that they test. Doing this in setup will make sure it happens for each test method.
    XCUIApplication *app = [[XCUIApplication alloc] init];

    // In UI tests it’s important to set the initial state - such as interface orientation - required for your tests before they run. The setUp method is a good place to do this.
    [app launch];
}

- (void)tearDown {
    // Put teardown code here. This method is called after the invocation of each test method in the class.
    [super tearDown];
}

- (void)testExample {
    // Use recording to get started writing UI tests.
    // Use XCTAssert and related functions to verify your tests produce the correct results.
    NSLog(@"Something is happening");
}
@end

非常感谢任何帮助，特别是考虑到Objective-C中的过程没有很好地记录。