Phase 2 of the modernization plan: lock the current behavior of the pure
math so the Phase 3 refactor cannot silently change it.
Unit characterization tests (Tier 0, 64 new):
- test_characterization_latents.py: chunk_batch / merge_chunks padding,
truncation, and identity contracts.
- test_characterization_controlnet.py: expand_inputs / no_control /
extract_residual_kwargs / chunk_control shape, dtype, and zero-fill
behavior, including the [None]*target contract.
- test_characterization_inputs.py: CoreMLInputs.chunks / coreml_kwargs
for SD1.5, SDXL base (time_ids len 6), SDXL refiner (time_ids len 5),
and LCM (timestep_cond).
- test_characterization_sdxl_options.py: add_sdxl_model_options time_ids
/ text_embeds assembly via a SimpleNamespace fake ModelPatcher and
inspect.getclosurevars on the returned model_function_wrapper.
- test_characterization_out_name.py: CoreMLConverter out_name encoding
for attn_impl suffix, batch/size, ControlNet, LoRA (sorted), SDXL.
M2 [Tier 2] golden image anchor (1 new):
- test_golden_image.py: posts the SD1.5+CoreML workflow to a local
ComfyUI server (auto-skips if unreachable), asserts SHA256 of the
generated PNG against tests/m2/goldens/sd15_seed42.sha256; falls back
to PSNR >= 40 dB if the hash drifts.
Test infra:
- pyproject.toml [tool.pytest.ini_options]: unit / m2 / smoke markers,
testpaths=tests; rootdir is now this package (was ComfyUI's pytest.ini).
- tests/conftest.py: bootstraps sys.path for comfy imports, auto-marks
tests by directory, and ignores the maintainer's WIP scaffolds
(test_experiments / test_unet_conversion / standalone_test) so they
don't break collection.
All 85 collected tests pass; two consecutive runs produced identical
results (run1: 3.55s, run2: 3.40s).
