What is an umbrella header?

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The umbrella header is the ‘master’ header file for a framework. Its use is that you can write

#import <UIKit/UIKit.h>

instead of

#import <UIKit/UIViewController.h>
#import <UIKit/UILabel.h>
#import <UIKit/UIButton.h>
#import <UIKit/UIDatePicker.h>

and so on.

For me, <XCTest/XCTestCase+AsynchronousTesting.h> is included in <XCTest/XCTest.h>. Maybe it is not for you? In that case, add the

#import <XCTest/XCTestCase+AsynchronousTesting.h>

manually.

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