Fix for introspection on windows

Author: FrancescAlted

tests/ndarray/test_dsl_kernels.py

@@ -8,6 +8,9 @@
 
 import subprocess
 import sys
+import tempfile
+import textwrap
+from pathlib import Path
 
 import numpy as np
 import pytest
@@ -592,20 +595,30 @@ def test_dsl_kernel_float_cast_with_global_linear_idx_no_segfault_subprocess():
     if blosc2.IS_WASM:
         pytest.skip("subprocess is not supported on emscripten/wasm32")
 
-    code = (
-        "import numpy as np\n"
-        "import blosc2\n"
-        "@blosc2.dsl_kernel\n"
-        "def kernel(start, stop, nitems):\n"
-        "    step = (float(stop) - float(start)) / float(nitems)\n"
-        "    return float(start) + _global_linear_idx * step  # noqa: F821\n"
-        "shape = (10, 100)\n"
-        "arr = blosc2.lazyudf(kernel, (-10, 10, 999), dtype=np.float32, shape=shape).compute()\n"
-        "exp = np.linspace(-10, 10, np.prod(shape), dtype=np.float32).reshape(shape)\n"
-        "np.testing.assert_allclose(arr, exp, rtol=1e-6, atol=1e-6)\n"
-        "print('ok')\n"
+    code = textwrap.dedent(
+        """
+        import numpy as np
+        import blosc2
+
+        @blosc2.dsl_kernel
+        def kernel(start, stop, nitems):
+            step = (float(stop) - float(start)) / float(nitems)
+            return float(start) + _global_linear_idx * step  # noqa: F821
+
+        shape = (10, 100)
+        arr = blosc2.lazyudf(kernel, (-10, 10, 999), dtype=np.float32, shape=shape).compute()
+        exp = np.linspace(-10, 10, np.prod(shape), dtype=np.float32).reshape(shape)
+        np.testing.assert_allclose(arr, exp, rtol=1e-6, atol=1e-6)
+        print("ok")
+        """
     )
-    result = subprocess.run([sys.executable, "-c", code], capture_output=True, text=True, check=False)
+
+    # Run from a real .py file so inspect.getsource() can recover the DSL source.
+    with tempfile.TemporaryDirectory() as tmpdir:
+        script = Path(tmpdir) / "dsl_kernel_subprocess.py"
+        script.write_text(code, encoding="utf-8")
+        result = subprocess.run([sys.executable, str(script)], capture_output=True, text=True, check=False)
+
     assert result.returncode == 0, (
         "subprocess failed (possible segfault/regression in DSL float-cast path):\n"
         f"stdout:\n{result.stdout}\n"