[WIP] Refactor Model Tests

tests/conftest.py

@@ -32,6 +32,21 @@
 
 def pytest_configure(config):
     config.addinivalue_line("markers", "big_accelerator: marks tests as requiring big accelerator resources")
+    config.addinivalue_line("markers", "lora: marks tests for LoRA/PEFT functionality")
+    config.addinivalue_line("markers", "ip_adapter: marks tests for IP Adapter functionality")
+    config.addinivalue_line("markers", "training: marks tests for training functionality")
+    config.addinivalue_line("markers", "attention: marks tests for attention processor functionality")
+    config.addinivalue_line("markers", "memory: marks tests for memory optimization functionality")
+    config.addinivalue_line("markers", "cpu_offload: marks tests for CPU offloading functionality")
+    config.addinivalue_line("markers", "group_offload: marks tests for group offloading functionality")
+    config.addinivalue_line("markers", "compile: marks tests for torch.compile functionality")
+    config.addinivalue_line("markers", "single_file: marks tests for single file checkpoint loading")
+    config.addinivalue_line("markers", "bitsandbytes: marks tests for BitsAndBytes quantization functionality")
+    config.addinivalue_line("markers", "quanto: marks tests for Quanto quantization functionality")
+    config.addinivalue_line("markers", "torchao: marks tests for TorchAO quantization functionality")
+    config.addinivalue_line("markers", "gguf: marks tests for GGUF quantization functionality")
+    config.addinivalue_line("markers", "modelopt: marks tests for NVIDIA ModelOpt quantization functionality")
+    config.addinivalue_line("markers", "context_parallel: marks tests for context parallel inference functionality")
 
 
 def pytest_addoption(parser):

tests/models/testing_utils/__init__.py

@@ -0,0 +1,41 @@
+from .attention import AttentionTesterMixin
+from .common import BaseModelTesterConfig, ModelTesterMixin
+from .compile import TorchCompileTesterMixin
+from .ip_adapter import IPAdapterTesterMixin
+from .lora import LoraHotSwappingForModelTesterMixin, LoraTesterMixin
+from .memory import CPUOffloadTesterMixin, GroupOffloadTesterMixin, LayerwiseCastingTesterMixin, MemoryTesterMixin
+from .parallelism import ContextParallelTesterMixin
+from .quantization import (
+    BitsAndBytesTesterMixin,
+    GGUFTesterMixin,
+    ModelOptTesterMixin,
+    QuantizationTesterMixin,
+    QuantoTesterMixin,
+    TorchAoTesterMixin,
+)
+from .single_file import SingleFileTesterMixin
+from .training import TrainingTesterMixin
+
+
+__all__ = [
+    "AttentionTesterMixin",
+    "BaseModelTesterConfig",
+    "BitsAndBytesTesterMixin",
+    "ContextParallelTesterMixin",
+    "CPUOffloadTesterMixin",
+    "GGUFTesterMixin",
+    "GroupOffloadTesterMixin",
+    "IPAdapterTesterMixin",
+    "LayerwiseCastingTesterMixin",
+    "LoraHotSwappingForModelTesterMixin",
+    "LoraTesterMixin",
+    "MemoryTesterMixin",
+    "ModelOptTesterMixin",
+    "ModelTesterMixin",
+    "QuantizationTesterMixin",
+    "QuantoTesterMixin",
+    "SingleFileTesterMixin",
+    "TorchAoTesterMixin",
+    "TorchCompileTesterMixin",
+    "TrainingTesterMixin",
+]

tests/models/testing_utils/attention.py

@@ -0,0 +1,185 @@
+# coding=utf-8
+# Copyright 2025 HuggingFace Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import pytest
+import torch
+
+from diffusers.models.attention import AttentionModuleMixin
+from diffusers.models.attention_processor import (
+    AttnProcessor,
+)
+
+from ...testing_utils import (
+    assert_tensors_close,
+    is_attention,
+    torch_device,
+)
+
+
+@is_attention
+class AttentionTesterMixin:
+    """
+    Mixin class for testing attention processor and module functionality on models.
+
+    Tests functionality from AttentionModuleMixin including:
+        - Attention processor management (set/get)
+        - QKV projection fusion/unfusion
+        - Attention backends (XFormers, NPU, etc.)
+
+    Expected class attributes to be set by subclasses:
+        - model_class: The model class to test
+        - base_precision: Tolerance for floating point comparisons (default: 1e-3)
+        - uses_custom_attn_processor: Whether model uses custom attention processors (default: False)
+
+    Expected methods to be implemented by subclasses:
+        - get_init_dict(): Returns dict of arguments to initialize the model
+        - get_dummy_inputs(): Returns dict of inputs to pass to the model forward pass
+
+    Pytest mark: attention
+        Use `pytest -m "not attention"` to skip these tests
+    """
+
+    base_precision = 1e-3
+
+    def test_fuse_unfuse_qkv_projections(self):
+        init_dict = self.get_init_dict()
+        inputs_dict = self.get_dummy_inputs()
+        model = self.model_class(**init_dict)
+        model.to(torch_device)
+        model.eval()
+
+        if not hasattr(model, "fuse_qkv_projections"):
+            pytest.skip("Model does not support QKV projection fusion.")
+
+        # Get output before fusion
+        with torch.no_grad():
+            output_before_fusion = model(**inputs_dict, return_dict=False)[0]
+
+        # Fuse projections
+        model.fuse_qkv_projections()
+
+        # Verify fusion occurred by checking for fused attributes
+        has_fused_projections = False
+        for module in model.modules():
+            if isinstance(module, AttentionModuleMixin):
+                if hasattr(module, "to_qkv") or hasattr(module, "to_kv"):
+                    has_fused_projections = True
+                    assert module.fused_projections, "fused_projections flag should be True"
+                    break
+
+        if has_fused_projections:
+            # Get output after fusion
+            with torch.no_grad():
+                output_after_fusion = model(**inputs_dict, return_dict=False)[0]
+
+            # Verify outputs match
+            assert_tensors_close(
+                output_before_fusion,
+                output_after_fusion,
+                atol=self.base_precision,
+                rtol=0,
+                msg="Output should not change after fusing projections",
+            )
+
+            # Unfuse projections
+            model.unfuse_qkv_projections()
+
+            # Verify unfusion occurred
+            for module in model.modules():
+                if isinstance(module, AttentionModuleMixin):
+                    assert not hasattr(module, "to_qkv"), "to_qkv should be removed after unfusing"
+                    assert not hasattr(module, "to_kv"), "to_kv should be removed after unfusing"
+                    assert not module.fused_projections, "fused_projections flag should be False"
+
+            # Get output after unfusion
+            with torch.no_grad():
+                output_after_unfusion = model(**inputs_dict, return_dict=False)[0]
+
+            # Verify outputs still match
+            assert_tensors_close(
+                output_before_fusion,
+                output_after_unfusion,
+                atol=self.base_precision,
+                rtol=0,
+                msg="Output should match original after unfusing projections",
+            )
+
+    def test_get_set_processor(self):
+        init_dict = self.get_init_dict()
+        model = self.model_class(**init_dict)
+        model.to(torch_device)
+
+        # Check if model has attention processors
+        if not hasattr(model, "attn_processors"):
+            pytest.skip("Model does not have attention processors.")
+
+        # Test getting processors
+        processors = model.attn_processors
+        assert isinstance(processors, dict), "attn_processors should return a dict"
+        assert len(processors) > 0, "Model should have at least one attention processor"
+
+        # Test that all processors can be retrieved via get_processor
+        for module in model.modules():
+            if isinstance(module, AttentionModuleMixin):
+                processor = module.get_processor()
+                assert processor is not None, "get_processor should return a processor"
+
+                # Test setting a new processor
+                new_processor = AttnProcessor()
+                module.set_processor(new_processor)
+                retrieved_processor = module.get_processor()
+                assert retrieved_processor is new_processor, "Retrieved processor should be the same as the one set"
+
+    def test_attention_processor_dict(self):
+        init_dict = self.get_init_dict()
+        model = self.model_class(**init_dict)
+        model.to(torch_device)
+
+        if not hasattr(model, "set_attn_processor"):
+            pytest.skip("Model does not support setting attention processors.")
+
+        # Get current processors
+        current_processors = model.attn_processors
+
+        # Create a dict of new processors
+        new_processors = {key: AttnProcessor() for key in current_processors.keys()}
+
+        # Set processors using dict
+        model.set_attn_processor(new_processors)
+
+        # Verify all processors were set
+        updated_processors = model.attn_processors
+        for key in current_processors.keys():
+            assert type(updated_processors[key]) == AttnProcessor, f"Processor {key} should be AttnProcessor"
+
+    def test_attention_processor_count_mismatch_raises_error(self):
+        init_dict = self.get_init_dict()
+        model = self.model_class(**init_dict)
+        model.to(torch_device)
+
+        if not hasattr(model, "set_attn_processor"):
+            pytest.skip("Model does not support setting attention processors.")
+
+        # Get current processors
+        current_processors = model.attn_processors
+
+        # Create a dict with wrong number of processors
+        wrong_processors = {list(current_processors.keys())[0]: AttnProcessor()}
+
+        # Verify error is raised
+        with pytest.raises(ValueError) as exc_info:
+            model.set_attn_processor(wrong_processors)
+
+        assert "number of processors" in str(exc_info.value).lower(), "Error should mention processor count mismatch"