Building test suite fails on Xcode 12 due to not finding XCTest.h header

[bvirlet]

• I have read CONTRIBUTING and have done my best to follow them.

What did you do?

I'm build our test suite for our current project (which builds fine with Xcode 11.4) with Xcode 12 Beta 3.

What did you expect to happen?

The tests fail to build with the following error:

/Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator14.0.sdk/Developer/Library/Frameworks/XCTest.framework/Modules/module.modulemap:2:21: error: umbrella header 'XCTest.h' not found
    umbrella header "XCTest.h"
                    ^
<module-includes>:2:9: note: in file included from <module-includes>:2:
#import "Headers/Nimble-Swift.h"
        ^
/Users/..<shortened>../Vendor/Carthage/Build/iOS/Nimble.framework/Headers/Nimble-Swift.h:199:9: error: could not build module 'XCTest'
@import XCTest;
        ^
<unknown>:0: error: could not build Objective-C module 'Nimble'

I have found the following Apple Forums thread which seems relevant but it doesn't give a definite answer. The suggestion solution from Apple engineers seem like a workaround, but also seems to imply that the testing frameworks (such as Quick/Nimble) are missing some settings.

I'm not sure if this is an Xcode 12 Beta 3 issue, or is there something that needs to be fixed. Your advice would be appreciated.

Thanks!

Environment

List the software versions you're using:

• Quick: 3.0.0
• Nimble: 8.1.1
• Xcode Version: Version 12.0 beta 3 (12A8169g)
• Swift Version: Xcode Default
• Carthage: 0.35.0 (Use carthage version in Terminal)

Additional information

• Test suite is hybrid Swift/Objective-C (but Quick/Nimble are only used in Swift). I don't have the problem with another project's Swift-only test suite.

[ikesyo]

Thanks for filing an issue. Could you try #803?

[bvirlet]

I got rid of the initial issue on my project by removing the following path "$(SDKROOT)/Developer/Library/Frameworks" from my test target FRAMEWORK_SEARCH_PATHS.