Is there a way to make a tests only project in Xcode?

Trying to add tests for FlockSwiftUtils. The project has no UI so I don't want to have a project with app target. Xcode does allow "None" as Host Application for the target so seems feasible.

The build for the target succeeds, but xctest fails with error

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xctest (41117) encountered an error (Early unexpected exit, operation never finished bootstrapping - no restart will be attempted. (Underlying error: The test runner failed to load the test bundle. Executable cannot be loaded for some other reason, such as a problem with a library it depends on or a code signature/entitlements mismatch.))

From logs:

13:35:05.753 Xcode[38272:7487908] Test operation failure: The test runner failed to load the test bundle. Executable cannot be loaded for some other reason, such as a problem with a library it depends on or a code signature/entitlements mismatch.
13:35:05.753 Xcode[38272:7487908] _finishWithError:Error Domain=IDETestOperationsObserverErrorDomain Code=5 "The test runner failed to load the test bundle. Executable cannot be loaded for some other reason, such as a problem with a library it depends on or a code signature/entitlements mismatch." UserInfo={NSLocalizedDescription=The test runner failed to load the test bundle. Executable cannot be loaded for some other reason, such as a problem with a library it depends on or a code signature/entitlements mismatch.}

The code for this is available in tests branch FlockSwiftUtils.