Add UTs for VNF activities

Change-Id: I2e055bcecb358f1531052815d6a8ba89f8270b07
Signed-off-by: Patricia Reinoso <patricia.reinoso@canonical.com>
diff --git a/osm_lcm/temporal/vnf_activities.py b/osm_lcm/temporal/vnf_activities.py
index 6f64a82..2e8ab1c 100644
--- a/osm_lcm/temporal/vnf_activities.py
+++ b/osm_lcm/temporal/vnf_activities.py
@@ -1,5 +1,4 @@
-#######################################################################################
-# Copyright ETSI Contributors and Others.
+#########################################################################
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -15,7 +14,6 @@
 # limitations under the License.
 
 import logging
-from temporalio import activity
 from osm_common.temporal_constants import (
     ACTIVITY_CHANGE_VNF_STATE,
     ACTIVITY_CHANGE_VNF_INSTANTIATION_STATE,
@@ -38,6 +36,7 @@
     VnfInstantiateInput,
 )
 from osm_lcm.data_utils.database.database import Database
+from temporalio import activity
 
 
 class VnfOperations:
@@ -52,7 +51,7 @@
         """Finds the appropriate task queue according to VIM type of VNF.
 
         Collaborators:
-            DB Access Object
+            DB read:           vim_accounts, vnfrs
 
         Raises (retryable):
             DbException: If DB read operations fail, the collection or DB record ID does not exist.
@@ -112,7 +111,7 @@
         """Gets the VNF record and VNF descriptor from Database.
 
         Collaborators:
-            DB Access Object
+            DB read:           vnfrs, vnfds
 
         Raises (retryable):
             DbException: If DB read operations fail, the collection or DB record ID does not exist.
@@ -134,8 +133,7 @@
 
 
 class VnfDbActivity:
-
-    """Perform Database operations for NS accounts.
+    """Perform Database operations for VNF accounts.
 
     Args:
         db  (Database):       Data Access Object
@@ -150,7 +148,7 @@
         """Updates the VNF State in VNFR.
 
         Collaborators:
-            DB Access Object
+            DB Write:           vnfrs
 
         Raises (retryable):
             DbException: If DB access/update fails, the collection or DB record ID does not exist.
@@ -180,7 +178,7 @@
         """Updates the VNF Instantiation State in VNFR.
 
         Collaborators:
-            DB Access Object
+            DB Write:           vnfrs
 
         Raises (retryable):
             DbException: If DB access or update fails, the collection or DB record ID does not exist.
@@ -214,7 +212,7 @@
         """Updates the model name of VNF in VNFR.
 
         Collaborators:
-            DB Access Object
+            DB Write:           vnfrs
 
         Raises (retryable):
             DbException: If DB access or update fails, the collection or DB record ID does not exist.