[tests] remove test_pipelines_common.py

.ai/references/testing.md

@@ -35,7 +35,7 @@ Follow the style introduced in [#14113](https://github.com/huggingface/diffusers
   - `HunyuanDiTAttentionPool` (`src/diffusers/models/embeddings.py`) shows the same failure without an MHA module: a plain `nn.Module` that hands its `q_proj` / `k_proj` / `v_proj` / `c_proj` weights to `torch.nn.functional.multi_head_attention_forward`, so all four projections stay offloaded rather than just one. `HunyuanDiT2DModel` opts out of group offloading entirely with `_supports_group_offloading = False`.
   - Before adding a skip or an exclusion, confirm the failure still reproduces — several existing skips are stale, having outlived the upstream cause.
 - **A migration that surfaces a `src/` gap marks the test `xfail`, it does not patch the pipeline.** Give the marker a module-level name and a `reason` naming the exact gap (`PNDM_*` in `tests/pipelines/pndm/test_pndm.py` is the worked example), and prefer `strict=True` so the marker reports XPASS — and gets deleted — the day the pipeline is fixed. Use `strict=False` only when one mark covers a group whose members do not all fail. Marking a whole test class keeps the mixin's own marks (`@is_memory`, `@require_accelerator`) intact; overriding individual inherited tests drops the decorators they were declared with, so re-declare those too.
-- **`from_pipe` tests** (a pipeline that is a variant of an existing one — PAG, AnimateDiff, ...) compose the shared `FromPipeTesterMixin` (`tests/pipelines/testing_utils/from_pipe.py`, exported from `..testing_utils`) in their own test class. It derives the original pipeline from `pipeline_class.__name__`; set `original_pipeline_repo` on the test class to pull it from a repo other than the default for that class. The unittest-era `PipelineFromPipeTesterMixin` in `tests/pipelines/test_pipelines_common.py` is what it replaces.
+- **`from_pipe` tests** (a pipeline that is a variant of an existing one — PAG, AnimateDiff, ...) compose the shared `FromPipeTesterMixin` (`tests/pipelines/testing_utils/from_pipe.py`, exported from `..testing_utils`) in their own test class. It derives the original pipeline from `pipeline_class.__name__`; set `original_pipeline_repo` on the test class to pull it from a repo other than the default for that class.
 - **A hardware gap is a conditional skip, not an xfail.** When a test fails only because the runner's cuDNN build has no kernel for an op — `RuntimeError: GET was unable to find an engine to execute this computation`, as Sana's depthwise `Conv2d` hits in bfloat16 — wrap the call in `skip_if_no_cudnn_engine()` (`tests/testing_utils.py`). It skips on that error and re-raises every other `RuntimeError`, so the test still runs wherever the kernel exists.
 - **PAG pipelines** also compose `PAGPipelineTesterMixin` (`tests/pipelines/pag/testing_utils.py`) in place of `PipelineTesterMixin`: it adds `test_pag_disable_enable` and `test_pag_inference` on top, driven by `base_pipeline_class` and the `pag_*` knobs on the test class. Keep `test_pag_applied_layers` per pipeline — which layers PAG resolves to is model-specific.
 - **`encode_prompt` reading a component that isn't a text encoder or tokenizer?** `test_encode_prompt_works_in_isolation` rebuilds the pipeline with only the components whose names contain `text` or `tokenizer`. When `encode_prompt` also needs another one — a `processor` used for chat templating, say — list it in `text_stack_component_names` on the config class rather than re-implementing the test.

.github/workflows/nightly_tests.yml

@@ -311,7 +311,6 @@ jobs:
           pytest -n 1 --max-worker-restart=0 --dist=loadfile \
             --make-reports=tests_torch_minimum_version_cuda \
             tests/models/test_modeling_common.py \
-            tests/pipelines/test_pipelines_common.py \
             tests/pipelines/test_pipeline_utils.py \
             tests/pipelines/test_pipelines.py \
             tests/pipelines/test_pipelines_auto.py \

.github/workflows/pr_tests_gpu.yml

@@ -14,8 +14,9 @@ on:
       - "src/diffusers/loaders/lora_base.py"
       - "src/diffusers/loaders/lora_pipeline.py"
       - "src/diffusers/loaders/peft.py"
-      - "tests/pipelines/test_pipelines_common.py"
+      - "tests/pipelines/testing_utils/**.py"
       - "tests/models/test_modeling_common.py"
+      - "tests/models/testing_utils/**.py"
       - "examples/**/*.py"
   workflow_dispatch:
 

.github/workflows/release_tests_fast.yml

@@ -205,7 +205,6 @@ jobs:
           pytest -n 1 --max-worker-restart=0 --dist=loadfile \
             --make-reports=tests_torch_minimum_cuda \
             tests/models/test_modeling_common.py \
-            tests/pipelines/test_pipelines_common.py \
             tests/pipelines/test_pipeline_utils.py \
             tests/pipelines/test_pipelines.py \
             tests/pipelines/test_pipelines_auto.py \

tests/models/transformers/test_models_transformer_flux.py

@@ -64,7 +64,7 @@
 
 
 # TODO: This standalone function maintains backward compatibility with pipeline tests
-# (tests/pipelines/test_pipelines_common.py) and will be refactored.
+# (tests/pipelines/testing_utils/ip_adapter.py) and will be refactored.
 def create_flux_ip_adapter_state_dict(model) -> dict[str, dict[str, Any]]:
     """Create a dummy IP Adapter state dict for Flux transformer testing."""
     ip_cross_attn_state_dict = {}

tests/pipelines/chroma/test_pipeline_chroma.py

@@ -4,9 +4,9 @@
 from diffusers import AutoencoderKL, ChromaPipeline, ChromaTransformer2DModel, FlowMatchEulerDiscreteScheduler
 
 from ...testing_utils import assert_tensors_close, torch_device
-from ..flux.testing_utils import FluxIPAdapterTesterMixin
 from ..testing_utils import (
     BasePipelineTesterConfig,
+    FluxIPAdapterTesterMixin,
     MemoryTesterMixin,
     PipelineTesterMixin,
     check_qkv_fused_layers_exist,

tests/pipelines/chroma/test_pipeline_chroma_img2img.py

@@ -6,9 +6,9 @@
 from diffusers import AutoencoderKL, ChromaImg2ImgPipeline, ChromaTransformer2DModel, FlowMatchEulerDiscreteScheduler
 
 from ...testing_utils import assert_tensors_close, floats_tensor, torch_device
-from ..flux.testing_utils import FluxIPAdapterTesterMixin
 from ..testing_utils import (
     BasePipelineTesterConfig,
+    FluxIPAdapterTesterMixin,
     MemoryTesterMixin,
     PipelineTesterMixin,
     check_qkv_fused_layers_exist,

tests/pipelines/controlnet_flux/test_controlnet_flux.py

@@ -40,8 +40,12 @@
     require_big_accelerator,
     torch_device,
 )
-from ..flux.testing_utils import FluxIPAdapterTesterMixin
-from ..testing_utils import BasePipelineTesterConfig, MemoryTesterMixin, PipelineTesterMixin
+from ..testing_utils import (
+    BasePipelineTesterConfig,
+    FluxIPAdapterTesterMixin,
+    MemoryTesterMixin,
+    PipelineTesterMixin,
+)
 
 
 enable_full_determinism()

tests/pipelines/deepfloyd_if/test_if.py

@@ -36,11 +36,11 @@
     slow,
     torch_device,
 )
-from ..test_pipelines_common import assert_mean_pixel_difference
 from ..testing_utils import (
     BasePipelineTesterConfig,
     PipelineOffloadTesterMixin,
     PipelineTesterMixin,
+    assert_mean_pixel_difference,
 )
 
 

tests/pipelines/deepfloyd_if/test_if_img2img.py

@@ -37,11 +37,11 @@
     slow,
     torch_device,
 )
-from ..test_pipelines_common import assert_mean_pixel_difference
 from ..testing_utils import (
     BasePipelineTesterConfig,
     PipelineOffloadTesterMixin,
     PipelineTesterMixin,
+    assert_mean_pixel_difference,
 )
 
 

tests/pipelines/deepfloyd_if/test_if_img2img_superresolution.py

@@ -37,11 +37,11 @@
     slow,
     torch_device,
 )
-from ..test_pipelines_common import assert_mean_pixel_difference
 from ..testing_utils import (
     BasePipelineTesterConfig,
     PipelineOffloadTesterMixin,
     PipelineTesterMixin,
+    assert_mean_pixel_difference,
 )
 
 

tests/pipelines/deepfloyd_if/test_if_inpainting.py

@@ -37,11 +37,11 @@
     slow,
     torch_device,
 )
-from ..test_pipelines_common import assert_mean_pixel_difference
 from ..testing_utils import (
     BasePipelineTesterConfig,
     PipelineOffloadTesterMixin,
     PipelineTesterMixin,
+    assert_mean_pixel_difference,
 )
 
 

tests/pipelines/deepfloyd_if/test_if_inpainting_superresolution.py

@@ -37,11 +37,11 @@
     slow,
     torch_device,
 )
-from ..test_pipelines_common import assert_mean_pixel_difference
 from ..testing_utils import (
     BasePipelineTesterConfig,
     PipelineOffloadTesterMixin,
     PipelineTesterMixin,
+    assert_mean_pixel_difference,
 )
 
 

tests/pipelines/deepfloyd_if/test_if_superresolution.py

@@ -37,11 +37,11 @@
     slow,
     torch_device,
 )
-from ..test_pipelines_common import assert_mean_pixel_difference
 from ..testing_utils import (
     BasePipelineTesterConfig,
     PipelineOffloadTesterMixin,
     PipelineTesterMixin,
+    assert_mean_pixel_difference,
 )
 
 

tests/pipelines/flux/test_pipeline_flux.py

@@ -31,6 +31,7 @@
     BasePipelineTesterConfig,
     FasterCacheTesterMixin,
     FirstBlockCacheTesterMixin,
+    FluxIPAdapterTesterMixin,
     LoraMemoryTesterMixin,
     LoraTesterMixin,
     MagCacheTesterMixin,
@@ -39,7 +40,6 @@
     PyramidAttentionBroadcastTesterMixin,
     TaylorSeerCacheTesterMixin,
 )
-from .testing_utils import FluxIPAdapterTesterMixin
 
 
 if is_peft_available():

tests/pipelines/flux/test_pipeline_flux_img2img.py

@@ -6,8 +6,12 @@
 from diffusers import AutoencoderKL, FlowMatchEulerDiscreteScheduler, FluxImg2ImgPipeline, FluxTransformer2DModel
 
 from ...testing_utils import floats_tensor, torch_device
-from ..testing_utils import BasePipelineTesterConfig, MemoryTesterMixin, PipelineTesterMixin
-from .testing_utils import FluxIPAdapterTesterMixin
+from ..testing_utils import (
+    BasePipelineTesterConfig,
+    FluxIPAdapterTesterMixin,
+    MemoryTesterMixin,
+    PipelineTesterMixin,
+)
 
 
 class FluxImg2ImgPipelineTesterConfig(BasePipelineTesterConfig):

tests/pipelines/flux/test_pipeline_flux_inpaint.py

@@ -6,8 +6,12 @@
 from diffusers import AutoencoderKL, FlowMatchEulerDiscreteScheduler, FluxInpaintPipeline, FluxTransformer2DModel
 
 from ...testing_utils import floats_tensor, torch_device
-from ..testing_utils import BasePipelineTesterConfig, MemoryTesterMixin, PipelineTesterMixin
-from .testing_utils import FluxIPAdapterTesterMixin
+from ..testing_utils import (
+    BasePipelineTesterConfig,
+    FluxIPAdapterTesterMixin,
+    MemoryTesterMixin,
+    PipelineTesterMixin,
+)
 
 
 class FluxInpaintPipelineTesterConfig(BasePipelineTesterConfig):

tests/pipelines/flux/test_pipeline_flux_kontext.py

@@ -13,11 +13,11 @@
 from ..testing_utils import (
     BasePipelineTesterConfig,
     FasterCacheTesterMixin,
+    FluxIPAdapterTesterMixin,
     MemoryTesterMixin,
     PipelineTesterMixin,
     PyramidAttentionBroadcastTesterMixin,
 )
-from .testing_utils import FluxIPAdapterTesterMixin
 
 
 class FluxKontextPipelineTesterConfig(BasePipelineTesterConfig):

tests/pipelines/flux/test_pipeline_flux_kontext_inpaint.py

@@ -14,11 +14,11 @@
 from ..testing_utils import (
     BasePipelineTesterConfig,
     FasterCacheTesterMixin,
+    FluxIPAdapterTesterMixin,
     MemoryTesterMixin,
     PipelineTesterMixin,
     PyramidAttentionBroadcastTesterMixin,
 )
-from .testing_utils import FluxIPAdapterTesterMixin
 
 
 class FluxKontextInpaintPipelineTesterConfig(BasePipelineTesterConfig):