Set NS_FOUNDATION_ALLOWS_TESTABLE_IMPORT when ENABLE_TESTING is set.

- Disable TestThread.test_threadName() as some of the tests are
  currently broken.

- Disable testing of FileManager._replaceItem() on Windows as it is
  not currently implemented on that platform.

Author: spevans

TestFoundation/CMakeLists.txt

@@ -115,6 +115,11 @@ target_link_libraries(TestFoundation PRIVATE
   FoundationXML)
 target_link_libraries(TestFoundation PRIVATE
   XCTest)
+if(ENABLE_TESTING)
+  target_compile_definitions(TestFoundation PRIVATE
+    NS_FOUNDATION_ALLOWS_TESTABLE_IMPORT)
+endif()
+
 
 # NOTE(compnerd) create a test "app" directory as we need the xdgTestHelper as
 # an executable peer and the binary will be placed in the directory with the

TestFoundation/TestFileManager.swift

@@ -1755,7 +1755,7 @@ VIDEOS=StopgapVideos
         }
         #endif
 
-        #if NS_FOUNDATION_ALLOWS_TESTABLE_IMPORT
+        #if NS_FOUNDATION_ALLOWS_TESTABLE_IMPORT && !os(Windows) // Not implemented on Windows yet
         print("note: Testing cross-platform replace implementation.", to: &stderr)
         try testReplaceMethod { (a, b, backupItemName, options) -> URL? in
             try fm._replaceItem(at: a, withItemAt: b, backupItemName: backupItemName, options: options, allowPlatformSpecificSyscalls: false)

TestFoundation/TestObjCRuntime.swift

@@ -64,7 +64,7 @@ class TestObjCRuntime: XCTestCase {
     #if NS_FOUNDATION_ALLOWS_TESTABLE_IMPORT
     func testClassesRenamedByAPINotes() throws {
         for entry in _NSClassesRenamedByObjCAPINotes {
-            XCTAssert(NSClassFromString(NSStringFromClass(entry.class)) === entry.class)
+            XCTAssert(try XCTUnwrap(NSClassFromString(NSStringFromClass(entry.class))) === entry.class)
             XCTAssert(NSStringFromClass(try XCTUnwrap(NSClassFromString(entry.objCName))) == entry.objCName)
         }
     }

TestFoundation/TestThread.swift

@@ -31,7 +31,7 @@ class TestThread : XCTestCase {
             ("test_sleepUntilDate", test_sleepUntilDate),
         ]
 
-#if NS_FOUNDATION_ALLOWS_TESTABLE_IMPORT
+#if NS_FOUNDATION_ALLOWS_TESTABLE_IMPORT && false // Disable for now as some tests are broken
         tests.append(contentsOf: [
             ("test_threadName", test_threadName),
         ])