Move test utils to dask_cuda.utils_test module

dask_cuda/utils.py

@@ -17,7 +17,7 @@
 import distributed  # noqa: required for dask.config.get("distributed.comm.ucx")
 from dask.config import canonical_name
 from dask.utils import format_bytes, parse_bytes
-from distributed import Worker, wait
+from distributed import wait
 from distributed.comm import parse_address
 
 try:
@@ -552,27 +552,6 @@ def _align(size, alignment_size):
         return _align(int(device_memory_limit), alignment_size)
 
 
-class MockWorker(Worker):
-    """Mock Worker class preventing NVML from getting used by SystemMonitor.
-
-    By preventing the Worker from initializing NVML in the SystemMonitor, we can
-    mock test multiple devices in `CUDA_VISIBLE_DEVICES` behavior with single-GPU
-    machines.
-    """
-
-    def __init__(self, *args, **kwargs):
-        distributed.diagnostics.nvml.device_get_count = MockWorker.device_get_count
-        self._device_get_count = distributed.diagnostics.nvml.device_get_count
-        super().__init__(*args, **kwargs)
-
-    def __del__(self):
-        distributed.diagnostics.nvml.device_get_count = self._device_get_count
-
-    @staticmethod
-    def device_get_count():
-        return 0
-
-
 def get_gpu_uuid_from_index(device_index=0):
     """Get GPU UUID from CUDA device index.
 

dask_cuda/utils_test.py

@@ -0,0 +1,23 @@
+import distributed
+from distributed import Worker
+
+
+class MockWorker(Worker):
+    """Mock Worker class preventing NVML from getting used by SystemMonitor.
+
+    By preventing the Worker from initializing NVML in the SystemMonitor, we can
+    mock test multiple devices in `CUDA_VISIBLE_DEVICES` behavior with single-GPU
+    machines.
+    """
+
+    def __init__(self, *args, **kwargs):
+        distributed.diagnostics.nvml.device_get_count = MockWorker.device_get_count
+        self._device_get_count = distributed.diagnostics.nvml.device_get_count
+        super().__init__(*args, **kwargs)
+
+    def __del__(self):
+        distributed.diagnostics.nvml.device_get_count = self._device_get_count
+
+    @staticmethod
+    def device_get_count():
+        return 0