pytest Integration

Decorate the test function with @pytest.mark.skipif(...) so the test is skipped if CUDA is unavailable.
Move all testing logic into a function named test_jit() so it’s automatically discoverable by pytest.

tests/test_jit.py

@@ -1,4 +1,5 @@
 import os
+import pytest
 import torch
 from typing import Any
 
@@ -6,6 +7,10 @@ from deep_gemm import jit
 
 
 class Capture:
+    """
+    Context manager to capture stdout via OS pipes.
+    """
+
     def __init__(self) -> None:
         self.read_fd = None
         self.write_fd = None
@@ -28,37 +33,66 @@ class Capture:
         return self.captured
 
 
-if __name__ == '__main__':
-    # Runtime
+@pytest.mark.skipif(not torch.cuda.is_available(), reason='CUDA is required for this test.')
+def test_jit():
+    # Print NVCC compiler
     print(f'NVCC compiler: {jit.get_nvcc_compiler()}\n')
 
-    # Templates
+    # Define function arguments and code body
     print('Generated code:')
-    args = (('lhs', torch.float8_e4m3fn), ('rhs', torch.float8_e4m3fn), ('scale', torch.float), ('out', torch.bfloat16),
-            ('enable_double_streams', bool), ('stream', torch.cuda.Stream))
-    body = "\n"
+    args = (
+        ('lhs', torch.float8_e4m3fn),
+        ('rhs', torch.float8_e4m3fn),
+        ('scale', torch.float),
+        ('out', torch.bfloat16),
+        ('enable_double_streams', bool),
+        ('stream', torch.cuda.Stream),
+    )
+
+    body = ''
     body += 'std::cout << reinterpret_cast<uint64_t>(lhs) << std::endl;\n'
     body += 'std::cout << reinterpret_cast<uint64_t>(rhs) << std::endl;\n'
     body += 'std::cout << reinterpret_cast<uint64_t>(scale) << std::endl;\n'
     body += 'std::cout << reinterpret_cast<uint64_t>(out) << std::endl;\n'
     body += 'std::cout << enable_double_streams << std::endl;\n'
     body += 'std::cout << reinterpret_cast<uint64_t>(stream) << std::endl;\n'
+
     code = jit.generate((), args, body)
     print(code)
 
-    # Build
+    # Build the function
     print('Building ...')
     func = jit.build('test_func', args, code)
 
     # Test correctness
     print('Running ...')
-    fp8_tensor = torch.empty((1, ), dtype=torch.float8_e4m3fn, device='cuda')
-    fp32_tensor = torch.empty((1, ), dtype=torch.float, device='cuda')
-    bf16_tensor = torch.empty((1, ), dtype=torch.bfloat16, device='cuda')
+    fp8_tensor = torch.empty((1,), dtype=torch.float8_e4m3fn, device='cuda')
+    fp32_tensor = torch.empty((1,), dtype=torch.float, device='cuda')
+    bf16_tensor = torch.empty((1,), dtype=torch.bfloat16, device='cuda')
+
     with Capture() as capture:
-        assert func(fp8_tensor, fp8_tensor, fp32_tensor, bf16_tensor, True, torch.cuda.current_stream()) == 0
+        ret = func(
+            fp8_tensor,
+            fp8_tensor,
+            fp32_tensor,
+            bf16_tensor,
+            True,
+            torch.cuda.current_stream(),
+        )
+        # If your JIT returns an error code, test it here
+        assert ret == 0, f'JIT function returned error code: {ret}'
+
     output = capture.capture()
-    ref_output = f'{fp8_tensor.data_ptr()}\n{fp8_tensor.data_ptr()}\n{fp32_tensor.data_ptr()}\n{bf16_tensor.data_ptr()}\n1\n{torch.cuda.current_stream().cuda_stream}\n'
-    assert output == ref_output, f'{output=}, {ref_output=}'
+    ref_output = (
+        f'{fp8_tensor.data_ptr()}\n'
+        f'{fp8_tensor.data_ptr()}\n'
+        f'{fp32_tensor.data_ptr()}\n'
+        f'{bf16_tensor.data_ptr()}\n'
+        f'1\n'
+        f'{torch.cuda.current_stream().cuda_stream}\n'
+    )
+
+    # Compare the captured output to the reference
+    assert output == ref_output, f'Mismatch!\nGot:\n{output}\nExpected:\n{ref_output}'
 
     print('JIT test passed')