[pigeon] Missing 'wrapResponse' method when using dartTestOut and only host APIs

[azchohfi]

Steps to reproduce

Use Pigeon 16.0.0 with a class that only has a HostApi, but exports tests, such as:
https://github.com/azchohfi/packages/blob/e8989e5d56030fdb57375c54b3107e695030061b/packages/video_player/video_player_windows/pigeons/messages.dart

Expected results

Generated dart classes should have the 'wrapResponse' method, since it is used by the test class.

Actual results

'wrapResponse' method is missing, so compilation fails.

Code sample

Code sample

import 'package:pigeon/pigeon.dart';

@ConfigurePigeon(PigeonOptions(
  dartOut: 'lib/src/messages.g.dart',
  dartTestOut: 'test/test_api.g.dart',
  cppHeaderOut: 'windows/messages.h',
  cppSourceOut: 'windows/messages.cpp',
  cppOptions: CppOptions(
    namespace: 'Messages',
  ),
  copyrightHeader: 'pigeons/copyright.txt',
))
@HostApi(dartHostTestHandler: 'TestHostVideoPlayerApi')
abstract class WindowsVideoPlayerApi {
  void initialize();
  int create(String? asset, String? uri, String? packageName,
      String? formatHint, Map<String?, String?> httpHeaders);
  void dispose(int textureId);
  void setLooping(int textureId, bool isLooping);
  void setVolume(int textureId, double volume);
  void setPlaybackSpeed(int textureId, double speed);
  void play(int textureId);
  int position(int textureId);
  void seekTo(int textureId, int position);
  void pause(int textureId);
  void setMixWithOthers(bool mixWithOthers);
}

Screenshots or Video

No response

Logs

Logs

test/test_api.g.dart:64:20: Error: Method not found: 'wrapResponse'.
            return wrapResponse(error: e);
                   ^^^^^^^^^^^^

Flutter Doctor output

Doctor output

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.16.6, on Microsoft Windows [Version 10.0.22621.3007], locale en-US)
[✓] Windows Version (Installed version of Windows is version 10 or higher)
[✓] Android toolchain - develop for Android devices (Android SDK version 33.0.0)
[✓] Chrome - develop for the web
[✓] Visual Studio - develop Windows apps (Visual Studio Enterprise 2022 17.8.4)
[!] Android Studio (not installed)
[✓] VS Code (version 1.85.1)
[✓] Connected device (3 available)
[✓] Network resources

! Doctor found issues in 1 category.

[azchohfi]

@stuartmorgan working on the fix for this, I'm wondering if this is exactly the case where I do need to add a new pigeon for a compilation test. Any insights?

[azchohfi]

I've solved it with a simpler unit test.

[github-actions]

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