When do app sources need to be included in test targets?

Question

In a new project I have this simple test

#import 
#import \"ViewController.h\"

@interface ViewControllerTests : XCTestCase
@end

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Answer 1

When you create a Unit Testing Bundle(Unit Testing target) for testing application you have two options

1. Enable Allow testing Host Application APIs

General -> Host  Application  -> >check< Allow testing Host Application APIs 

• slow build

2. Add every app's tested file into Target Membership[About]

• you should take care of classes dependencies which are used into testable class(they should be added too)

When you write a test and no one option was not enabled you can get

Undefined symbol: nominal type descriptor for 
Undefined symbol: type metadata accessor for