Can't use Swift classes inside Objective-C unit test

Question

I have followed this recipe in order to use a Swift class in an existing Objective-C project MyProject. That works fine.

However, I'm still not able to use the same Swift class in the same project's unit tests. The compiler marks the line where my Objective-C unit test says #import "MyProjectTests-Swift.h" with file not found.

If tried changing the test target's Product Module Name from its default MyProjectTests to MyProject as suggested in a comment to this (unanswered) question. However the compiler now marks the line where my Objective-C unit test says #import "MyProject-Swift.h" with file not found.

So how can one integrate Swift classes into (XCTest) unit tests that are written in Objective-C? Does Apple provide any recipe?

Answer 1

Step-1

Go to your test target > Build Settings > Header Search Paths, and add $CONFIGURATION_TEMP_DIR/YourProject.build/DerivedSources in it.

Step-2

#import "YourProject-Swift.h"

Answer 2

Go to test target > Build Settings > Header Search Paths, and add $CONFIGURATION_TEMP_DIR/MyProject.build/DerivedSources in it. For me worked only without checking Swift classes targeted for MyProjectTests. Source: https://medium.com/if-let-swift-programming/ios-tests-working-with-objective-c-and-swift-class-together-aaf40f91a27c

Answer 3

As per @SushiGrassJacob's comment (see here) the following solves the issue:

1. Make sure that Swift classes are targeted to both MyProject and MyProjectTest.
2. In unit test, #import "MyProjectTests-Swift.h".