demo: use pytest subtests in cuda.core system device loops to ensure full test coverage

[rwgk]

Keep per-device skips and xfails from aborting the rest of the GPU system coverage.

Require pytest >= 9.0 in cuda.core test environments so the built-in subtests fixture is available.

To see how simple this change is, it's best to review with "Hide whitespace":

---

git diff -b -w main -- cuda_core/tests/

@@ -341,8 +341,9 @@ def test_c2c_mode_enabled():


 @pytest.mark.skipif(helpers.IS_WSL or helpers.IS_WINDOWS, reason="Persistence mode not supported on WSL or Windows")
-def test_persistence_mode_enabled():
+def test_persistence_mode_enabled(subtests):
     for device in system.Device.get_all_devices():
+        with subtests.test(device_index=device.index):
             is_enabled = device.is_persistence_mode_enabled
             assert isinstance(is_enabled, bool)
             try:
@@ -615,14 +616,16 @@ def test_clock_event_reasons():
         assert all(isinstance(reason, system.ClocksEventReasons) for reason in reasons)


-def test_fan():
+def test_fan(subtests):
     for device in system.Device.get_all_devices():
         # The fan APIs are only supported on discrete devices with fans,
         # but when they are not available `device.num_fans` returns 0.
         if device.num_fans == 0:
+            with subtests.test(device_index=device.index):
                 pytest.skip("Device has no fans to test")

         for fan_idx in range(device.num_fans):
+            with subtests.test(device_index=device.index, fan_idx=fan_idx):
                 fan_info = device.get_fan(fan_idx)
                 assert isinstance(fan_info, _device.FanInfo)

@@ -655,8 +658,9 @@ def test_fan():
                     fan_info.set_default_speed()


-def test_cooler():
+def test_cooler(subtests):
     for device in system.Device.get_all_devices():
+        with subtests.test(device_index=device.index):
             # The cooler APIs are only supported on discrete devices with fans,
             # but when they are not available `device.num_fans` returns 0.
             if device.num_fans == 0:

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