Systematically add test_*_init_disabled (front and back doors)

Author: rwgk

cuda_core/tests/test_context.py

@@ -0,0 +1,16 @@
+# Copyright 2025 NVIDIA Corporation.  All rights reserved.
+#
+# Please refer to the NVIDIA end user license agreement (EULA) associated
+# with this source code for terms and conditions that govern your use of
+# this software. Any use, reproduction, disclosure, or distribution of
+# this software and related documentation outside the terms of the EULA
+# is strictly prohibited.
+
+import pytest
+
+import cuda.core.experimental
+
+
+def test_context_init_disabled():
+    with pytest.raises(RuntimeError, match=r"^Context objects cannot be instantiated directly\."):
+        cuda.core.experimental._context.Context()  # Ensure back door is locked.

cuda_core/tests/test_device.py

@@ -13,10 +13,16 @@
     from cuda import cudart as runtime
 import pytest
 
+import cuda.core.experimental
 from cuda.core.experimental import Device
 from cuda.core.experimental._utils import ComputeCapability, get_binding_version, handle_return
 
 
+def test_device_init_disabled():
+    with pytest.raises(RuntimeError, match=r"^DeviceProperties cannot be instantiated directly\."):
+        cuda.core.experimental._device.DeviceProperties()  # Ensure back door is locked.
+
+
 @pytest.fixture(scope="module")
 def cuda_version():
     # binding availability depends on cuda-python version

cuda_core/tests/test_event.py

@@ -8,9 +8,15 @@
 
 import pytest
 
+import cuda.core.experimental
 from cuda.core.experimental import Device, EventOptions
 
 
+def test_event_init_disabled():
+    with pytest.raises(RuntimeError, match=r"^Event objects cannot be instantiated directly\."):
+        cuda.core.experimental._event.Event()  # Ensure back door is locked.
+
+
 @pytest.mark.parametrize("enable_timing", [True, False, None])
 def test_timing(init_cuda, enable_timing):
     options = EventOptions(enable_timing=enable_timing)

cuda_core/tests/test_module.py

@@ -11,6 +11,7 @@
 
 import pytest
 
+import cuda.core.experimental
 from cuda.core.experimental import ObjectCode, Program, ProgramOptions, system
 
 SAXPY_KERNEL = """
@@ -28,6 +29,21 @@
 """
 
 
+def test_kernel_attributes_init_disabled():
+    with pytest.raises(RuntimeError, match=r"^KernelAttributes cannot be instantiated directly\."):
+        cuda.core.experimental._module.KernelAttributes()  # Ensure back door is locked.
+
+
+def test_kernel_init_disabled():
+    with pytest.raises(RuntimeError, match=r"^Kernel objects cannot be instantiated directly\."):
+        cuda.core.experimental._module.Kernel()  # Ensure back door is locked.
+
+
+def test_object_code_init_disabled():
+    with pytest.raises(RuntimeError, match=r"^ObjectCode objects cannot be instantiated directly\."):
+        ObjectCode()  # Reject at front door.
+
+
 @pytest.fixture(scope="function")
 def get_saxpy_kernel(init_cuda):
     # prepare program

cuda_core/tests/test_stream.py

@@ -14,9 +14,9 @@
 from cuda.core.experimental._utils import driver
 
 
-def test_stream_init():
-    with pytest.raises(RuntimeError):
-        Stream()
+def test_stream_init_disabled():
+    with pytest.raises(RuntimeError, match=r"^Stream objects cannot be instantiated directly\."):
+        Stream()  # Reject at front door.
 
 
 def test_stream_init_with_options(init_cuda):