Allow running tests_resources.py with only KUBECONFIG exported

test/pytest/test_resources.py

@@ -10,10 +10,10 @@ Documentation for the kubernetes client:
 * https://github.com/kubernetes-client/python/tree/master/examples
 """
 import os
-from kubernetes import client, config
-from kubernetes.client.rest import ApiException
 
 import pytest
+from kubernetes import client, config
+from kubernetes.client.rest import ApiException
 
 # Helper functions
 
@@ -134,7 +134,10 @@ def run_around_tests():
     Prepare kube config before running a test
     """
     cluster_dir = os.environ.get("CLUSTER_DIR")
-    kubeconfig = os.path.join('..', str(cluster_dir), 'kube_config_cluster.yml')
+    if cluster_dir:
+        kubeconfig = os.path.join('..', str(cluster_dir), 'kube_config_cluster.yml')
+    else:
+        kubeconfig = os.path.join(os.environ.get("KUBECONFIG"))
     config.load_kube_config(config_file=kubeconfig)
     yield