XCTest bundle resources issue

README.md

This gist shows how resources aren't getting included in XCTest bundles

To reproduce:

• Use a Mac that has Xcode installed
• Clone this gist
• Build and test with cmake:

  cmake -H. -Bbuild && (cd build; make && ctest --output-on-failure)

• Observe test failure

The output I'm getting looks like this:

-- Configuring done
-- Generating done
-- Build files have been written to: /Users/mcg/src/testing/bundle-resources/build
[ 50%] Built target host_app
[100%] Built target xctest
Test project /Users/mcg/src/testing/bundle-resources/build
    Start 1: xctest
1/1 Test #1: xctest ...........................***Failed    0.17 sec
Test Suite 'All tests' started at 2019-12-05 10:52:20.900
Test Suite 'xctest.xctest' started at 2019-12-05 10:52:20.901
Test Suite 'FSTExampleTests' started at 2019-12-05 10:52:20.901
Test Case '-[FSTExampleTests testBundleLoading]' started.
/Users/mcg/src/testing/bundle-resources/test.mm:17: error: -[FSTExampleTests testBundleLoading] : ((error) == nil) failed: "Error Domain=NSCocoaErrorDomain Code=260 "The folder “Resources” doesn’t exist." UserInfo={NSFilePath=/Users/mcg/src/testing/bundle-resources/build/xctest.xctest/Contents/Resources, NSUserStringVariant=(
    Folder
), NSUnderlyingError=0x7ff099c17e80 {Error Domain=NSOSStatusErrorDomain Code=-43 "fnfErr: File not found"}}"
/Users/mcg/src/testing/bundle-resources/test.mm:18: error: -[FSTExampleTests testBundleLoading] : (([files count]) equal to (1)) failed: ("0") is not equal to ("1")
Test Case '-[FSTExampleTests testBundleLoading]' failed (0.096 seconds).
Test Suite 'FSTExampleTests' failed at 2019-12-05 10:52:20.996.
	 Executed 1 test, with 2 failures (0 unexpected) in 0.096 (0.096) seconds
Test Suite 'xctest.xctest' failed at 2019-12-05 10:52:20.997.
	 Executed 1 test, with 2 failures (0 unexpected) in 0.096 (0.096) seconds
Test Suite 'All tests' failed at 2019-12-05 10:52:20.997.
	 Executed 1 test, with 2 failures (0 unexpected) in 0.096 (0.096) seconds


0% tests passed, 1 tests failed out of 1

Total Test time (real) =   0.17 sec

The following tests FAILED:
	  1 - xctest (Failed)
Errors while running CTest

No resources are created:

$ find build/xctest.xctest -type f
build/xctest.xctest/Contents/MacOS/xctest
build/xctest.xctest/Contents/Info.plist

I would have expected to also be present

build/xctest.xctest/Contents/Resources/test.json

CMakeLists.txt

cmake_minimum_required(VERSION 3.5.1)
project(bundle-resources VERSION 0.0.1 LANGUAGES C CXX)
enable_testing()

set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)

set(
  objc_flags

  -Wblock-capture-autoreleasing
  -Wimplicit-atomic-properties
  -Wnon-modular-include-in-framework-module

  -fobjc-arc
  -fmodules
  -fno-autolink
)

find_package(XCTest REQUIRED)

add_executable(
  host_app MACOSX_BUNDLE
  host.m
)

target_compile_options(
  host_app PRIVATE
  ${objc_flags}
)

target_link_libraries(
  host_app PRIVATE
  "-framework Foundation"
  "-framework AppKit"
)

xctest_add_bundle(
  xctest host_app
  test.mm
)

set(resources test.json)

set_target_properties(
  xctest PROPERTIES
  RESOURCE "${resources}"
)

xctest_add_test(
  xctest xctest
)

host.m

#import <Cocoa/Cocoa.h>

int main(int argc, const char* argv[]) {
  return NSApplicationMain(argc, argv);
}

test.json

{
  "test": true
}

test.mm

#import <Foundation/Foundation.h>
#import <XCTest/XCTest.h>

NS_ASSUME_NONNULL_BEGIN

@interface FSTExampleTests : XCTestCase
@end

@implementation FSTExampleTests

- (void)testBundleLoading {
  NSBundle *bundle = [NSBundle bundleForClass:[self class]];
  NSFileManager *fs = [NSFileManager defaultManager];

  NSError *error;
  NSArray<NSString *> *files = [fs contentsOfDirectoryAtPath:[bundle resourcePath] error:&error];
  XCTAssertNil(error);
  XCTAssertEqual([files count], 1);
}

@end

NS_ASSUME_NONNULL_END