Added test for subPath addition

Author: marcopaggioro

charts/docker-mailserver/tests/pvc_test.yaml

@@ -29,4 +29,15 @@ tests:
 
   - it: manifest should match snapshot
     asserts:
-      - matchSnapshot: { }
+      - matchSnapshot: { }
+
+  - it: should use subPath for volumes if defined
+    set:
+      persistence:
+        mail-data:
+          subPath: another-folder
+    documentIndex: 1
+    asserts:
+      - equal:
+          path: spec.template.spec.containers[0].volumeMounts[?(@.name=="mail-data")].subPath
+          value: another-folder