From d6bec75e4379d118f13038f3f04e7bc9f7e0099f Mon Sep 17 00:00:00 2001
From: Bert Blommers <bblommers@users.noreply.github.com>
Date: Thu, 31 Mar 2022 11:40:06 +0000
Subject: [PATCH] ELBV2 - Ensure ResourceARN is returned when describing tags
 (#4990)

---
 moto/elbv2/responses.py        | 4 ++--
 tests/test_elbv2/test_elbv2.py | 6 ++++--
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/moto/elbv2/responses.py b/moto/elbv2/responses.py
index 8b97cae70..e9a53d495 100644
--- a/moto/elbv2/responses.py
+++ b/moto/elbv2/responses.py
@@ -635,9 +635,9 @@ REMOVE_TAGS_TEMPLATE = """<RemoveTagsResponse xmlns="http://elasticloadbalancing
 DESCRIBE_TAGS_TEMPLATE = """<DescribeTagsResponse xmlns="http://elasticloadbalancing.amazonaws.com/doc/2015-12-01/">
   <DescribeTagsResult>
     <TagDescriptions>
-      {% for resource, tags in resource_tags.items() %}
+      {% for resource_arn, tags in resource_tags.items() %}
       <member>
-        <ResourceArn>{{ resource.arn }}</ResourceArn>
+        <ResourceArn>{{ resource_arn }}</ResourceArn>
         <Tags>
           {% for key, value in tags.items() %}
           <member>
diff --git a/tests/test_elbv2/test_elbv2.py b/tests/test_elbv2/test_elbv2.py
index 89924e57b..e70346ca2 100644
--- a/tests/test_elbv2/test_elbv2.py
+++ b/tests/test_elbv2/test_elbv2.py
@@ -30,10 +30,12 @@ def test_create_load_balancer():
     )
     lb.get("CreatedTime").tzinfo.should_not.be.none
     lb.get("State").get("Code").should.equal("provisioning")
+    lb_arn = lb.get("LoadBalancerArn")
 
     # Ensure the tags persisted
-    response = conn.describe_tags(ResourceArns=[lb.get("LoadBalancerArn")])
-    tags = {d["Key"]: d["Value"] for d in response["TagDescriptions"][0]["Tags"]}
+    tag_desc = conn.describe_tags(ResourceArns=[lb_arn])["TagDescriptions"][0]
+    tag_desc.should.have.key("ResourceArn").equals(lb_arn)
+    tags = {d["Key"]: d["Value"] for d in tag_desc["Tags"]}
     tags.should.equal({"key_name": "a_value"})