added test asserts and review comments

moto/ec2/models.py

@@ -2901,7 +2901,7 @@ class VPCBackend(object):
         #validates if vpc is present or not.
         self.get_vpc(vpc_id)
 
-        if type == "interface" or "Interface ":
+        if type and type.lower() == "interface":
 
             network_interface_ids = []
             for subnet_id in subnet_ids:
@@ -2920,6 +2920,8 @@ class VPCBackend(object):
                     route_table_id,
                     service_destination_cidr
                 )
+        if dns_entries:
+            dns_entries = [dns_entries]
 
         vpc_end_point = VPCEndPoint(
             vpc_endpoint_id,
@@ -2930,7 +2932,7 @@ class VPCBackend(object):
             route_table_ids,
             subnet_ids,
             network_interface_ids,
-            [dns_entries],
+            dns_entries,
             client_token,
             security_group,
             tag_specifications,

moto/ec2/responses/vpcs.py

@@ -439,12 +439,14 @@ CREATE_VPC_END_POINT = """ <CreateVpcEndpointResponse xmlns="http://monitoring.a
             {% endfor %}
         </subnetIdSet>
         <dnsEntrySet>
+        {% if vpc_end_point.dns_entries  %}
             {% for entry in vpc_end_point.dns_entries %}
             <item>
                 <hostedZoneId>{{ entry["hosted_zone_id"] }}</hostedZoneId>
                 <dnsName>{{ entry["dns_name"] }}</dnsName>
             </item>
             {% endfor %}
+        {% endif %}
         </dnsEntrySet>
         <creationTimestamp>{{ vpc_end_point.created_at }}</creationTimestamp>
     </vpcEndpoint>