Restore scope="module" for subprocess_kernels_client.

Author: fleming79

tests/conftest.py

@@ -79,7 +79,7 @@ def kernel_name(request):
     return request.param
 
 
-@pytest.fixture
+@pytest.fixture(scope="module")
 async def subprocess_kernels_client(anyio_backend, tmp_path_factory, kernel_name: KernelName):
     """Starts a kernel in a subprocess and returns an AsyncKernelCient that is connected to it.
 

tests/utils.py

@@ -35,9 +35,9 @@ class ExecuteContentType(TypedDict):
 
 def clear_kernel():
     "Clear the kernel so it can be started fresh."
-    if kernel := Kernel._instance:
+    if kernel := Kernel._instance:  # pyright: ignore[reportPrivateUsage]
         kernel.stop()
-    Kernel._instance = None
+    Kernel._instance = None  # pyright: ignore[reportPrivateUsage]
     AsyncInteractiveShell.clear_instance()
     Caller.stop_all()