diff --git a/dockertidy/tests/unit/test_autostop.py b/dockertidy/tests/unit/test_autostop.py
index 51ef67f..8b76fdf 100644
--- a/dockertidy/tests/unit/test_autostop.py
+++ b/dockertidy/tests/unit/test_autostop.py
@@ -11,7 +11,13 @@ pytest_plugins = [
 
 
 @pytest.fixture
-def autostop():
+def autostop(mocker):
+    mocker.patch.object(
+        Autostop.AutoStop,
+        "_get_docker_client",
+        return_value=mocker.create_autospec(docker.APIClient)
+    )
+
     stop = Autostop.AutoStop()
     return stop
 
diff --git a/dockertidy/tests/unit/test_garbagecollector.py b/dockertidy/tests/unit/test_garbagecollector.py
index 7d2ec97..9f48f87 100644
--- a/dockertidy/tests/unit/test_garbagecollector.py
+++ b/dockertidy/tests/unit/test_garbagecollector.py
@@ -12,7 +12,13 @@ pytest_plugins = [
 
 
 @pytest.fixture
-def gc():
+def gc(mocker):
+    mocker.patch.object(
+        GarbageCollector.GarbageCollector,
+        "_get_docker_client",
+        return_value=mocker.create_autospec(docker.APIClient)
+    )
+
     gc = GarbageCollector.GarbageCollector()
     return gc