diff --git a/cognite/client/data_classes/_base.py b/cognite/client/data_classes/_base.py
index e0e48197ce..b9563868cc 100644
--- a/cognite/client/data_classes/_base.py
+++ b/cognite/client/data_classes/_base.py
@@ -259,15 +259,12 @@ def _load(
             return cls._load(json.loads(resource_list), cognite_client=cognite_client)
 
         elif isinstance(resource_list, list):
-            global ASDF
-            ASDF.append(resource_list)
             resources = [cls._RESOURCE._load(resource, cognite_client=cognite_client) for resource in resource_list]
             return cls(resources, cognite_client=cognite_client)
 
         raise TypeError(f"Resource list must be json str or list of dicts, not {type(resource_list)}")
 
 
-ASDF = []
 T_CogniteResourceList = TypeVar("T_CogniteResourceList", bound=CogniteResourceList)
 
 
diff --git a/tests/tests_unit/test_base.py b/tests/tests_unit/test_base.py
index 7889b10c21..ba2f28f748 100644
--- a/tests/tests_unit/test_base.py
+++ b/tests/tests_unit/test_base.py
@@ -24,6 +24,7 @@
     CogniteUpdate,
 )
 from cognite.client.exceptions import CogniteMissingClientError
+from tests.utils import all_subclasses
 
 
 class MyResource(CogniteResource):
@@ -118,18 +119,6 @@ def _load(cls, api_response):
         return cls(data["varA"])
 
 
-def all_subclasses(cls: type) -> list[type]:
-    return sorted(
-        filter(
-            # Get all subclasses, but not from any test directory:
-            lambda cls: str(cls).startswith("<class 'cognite.client"),
-            set(cls.__subclasses__()).union(s for c in cls.__subclasses__() for s in all_subclasses(c)),
-        ),
-        # Return subclasses in sorted 'import path' order
-        key=str,
-    )
-
-
 class TestVerifyAllCogniteSubclasses:
     @pytest.mark.parametrize("subclass", all_subclasses(CogniteResource))
     def test_all_cognite_resource_subclasses(self, subclass):
diff --git a/tests/utils.py b/tests/utils.py
index a08e0276c0..3080941c08 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -11,6 +11,20 @@
 from cognite.client.utils._auxiliary import random_string
 
 
+def all_subclasses(cls: type) -> list[type]:
+    """Returns a list (without duplicates) of all subclasses of a given class, sorted on import-path-name.
+
+    Ignores classes not part of the main library, e.g. subclasses part of tests.
+    """
+    return sorted(
+        filter(
+            lambda cls: str(cls).startswith("<class 'cognite.client"),
+            set(cls.__subclasses__()).union(s for c in cls.__subclasses__() for s in all_subclasses(c)),
+        ),
+        key=str,
+    )
+
+
 @contextmanager
 def rng_context(seed: int):
     """Temporarily override internal random state for deterministic behaviour without side-effects