Preview 에서 다음과같은 에러가 난다면 codeCoverageEnabled 를 No 로 셋팅하세요.
linker command failed with exit code 1 (use -v to see invocation)
----------------------------------------
LinkDylibError: Failed to build WidgetTestView.swift
Linking failed: linker command failed with exit code 1 (use -v to see invocation)
ld: warning: directory not found for option '-F/Applications/Xcode.app/Contents/SharedFrameworks-iphonesimulator'
undef: ___llvm_profile_runtime
Undefined symbols for architecture x86_64:
"___llvm_profile_runtime", referenced from:
___llvm_profile_runtime_user in FirebaseABTesting(ABTConditionalUserPropertyController.o)
(maybe you meant: ___llvm_profile_runtime_user)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)