Add pytest fixtures in conftest.py

[yurekami]

Description

Add pytest configuration and reusable fixtures for DeepGEMM tests.

Features

Auto-Configuration

• Auto-marks tests based on file names (test_fp8.py → @pytest.mark.fp8)
• Auto-skips GPU tests when CUDA is not available

Session Fixtures

Fixture	Description
cuda_device	Provides CUDA device, skips if unavailable
gpu_arch	Returns GPU architecture major version (9=Hopper, 10=Blackwell)
is_hopper	Boolean check for SM90 GPU
is_blackwell	Boolean check for SM100 GPU
deep_gemm_module	Provides imported deep_gemm module
env_vars	Dict of common DeepGEMM environment variables

Test Fixtures

Fixture	Description
reset_cuda_memory	Auto-cleanup CUDA memory after each test (autouse)
random_seed	Reproducible random state (seed=42)

Usage Example

def test_fp8_gemm(cuda_device, is_hopper):
    if not is_hopper:
        pytest.skip("Requires Hopper GPU")
    # test code using cuda_device...

Benefits

• Automatic GPU detection and test skipping
• Reusable fixtures reduce code duplication
• Memory cleanup prevents OOM in test suites
• Works with pytest.ini markers from PR Add pytest configuration #265

Testing

• Valid Python syntax
• Verify fixtures work with existing tests

🤖 Generated with Claude Code