Don't set attachments path if no file I/O

Author: grynspan

Sources/Testing/ABI/EntryPoints/EntryPoint.swift

@@ -553,7 +553,7 @@ public func configurationForEntryPoint(from args: __CommandLineArguments_v0) thr
   return configuration
 }
 
-#if canImport(Foundation) && !SWT_NO_FILE_IO
+#if canImport(Foundation) && (!SWT_NO_FILE_IO || !SWT_NO_ABI_ENTRY_POINT)
 /// Create an event handler that streams events to the given file using the
 /// specified ABI version.
 ///

Sources/Testing/ABI/v0/ABIv0.Record+Streaming.swift

@@ -21,17 +21,17 @@ extension ABIv0.Record {
     // We don't actually expect the JSON encoder to produce output containing
     // newline characters, so in debug builds we'll log a diagnostic message.
     if _slowPath(json.contains(where: \.isASCIINewline)) {
-  #if DEBUG
+#if DEBUG && !SWT_NO_FILE_IO
       let message = Event.ConsoleOutputRecorder.warning(
         "JSON encoder produced one or more newline characters while encoding an event to JSON. Please file a bug report at https://github.com/swiftlang/swift-testing/issues/new",
         options: .for(.stderr)
       )
-  #if SWT_TARGET_OS_APPLE
+#if SWT_TARGET_OS_APPLE
       try? FileHandle.stderr.write(message)
-  #else
+#else
       print(message)
-  #endif
-  #endif
+#endif
+#endif
 
       // Remove the newline characters to conform to JSON lines specification.
       var json = Array(json)

Sources/Testing/ExitTests/ExitTest.swift

@@ -11,6 +11,9 @@
 private import _TestingInternals
 
 #if !SWT_NO_EXIT_TESTS
+#if SWT_NO_FILE_IO
+#error("Platform-specific misconfiguration: support for exit tests requires support for file I/O")
+#endif
 #if SWT_NO_PIPES
 #error("Platform-specific misconfiguration: support for exit tests requires support for (anonymous) pipes")
 #endif

Sources/Testing/ExitTests/SpawnProcess.swift

@@ -11,6 +11,10 @@
 internal import _TestingInternals
 
 #if !SWT_NO_PROCESS_SPAWNING
+#if SWT_NO_FILE_IO
+#error("Platform-specific misconfiguration: support for process spawning requires support for file I/O")
+#endif
+
 /// A platform-specific value identifying a process running on the current
 /// system.
 #if SWT_TARGET_OS_APPLE || os(Linux) || os(FreeBSD)

Sources/Testing/Running/Runner.swift

@@ -369,9 +369,11 @@ extension Runner {
   private static func _run(_ runner: Self) async {
     var runner = runner
     runner.configureEventHandlerRuntimeState()
+#if !SWT_NO_FILE_IO
     if let attachmentDirectoryPath = runner.configuration.attachmentDirectoryPath {
       runner.configureToWriteAttachments(toDirectoryAtPath: attachmentDirectoryPath)
     }
+#endif
 
     // Track whether or not any issues were recorded across the entire run.
     let issueRecorded = Locked(rawValue: false)