From c95254a2843fac342e702f7708cce63274a053d0 Mon Sep 17 00:00:00 2001
From: Brady <brady.jubic@gsa.gov>
Date: Wed, 5 Feb 2020 11:58:52 -0500
Subject: [PATCH] delete tags when their resource is deleted

---
 moto/events/models.py                        |  2 ++
 moto/utilities/tagging_service.py            |  3 +++
 tests/test_utilities/test_tagging_service.py | 17 ++++++++++++++++-
 3 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/moto/events/models.py b/moto/events/models.py
index 695cfb17a..82723ac6c 100644
--- a/moto/events/models.py
+++ b/moto/events/models.py
@@ -143,6 +143,8 @@ class EventsBackend(BaseBackend):
 
     def delete_rule(self, name):
         self.rules_order.pop(self.rules_order.index(name))
+        arn = self.rules.get(name).arn
+        self.tagger.delete_all_tags_for_resource(arn)
         return self.rules.pop(name) is not None
 
     def describe_rule(self, name):
diff --git a/moto/utilities/tagging_service.py b/moto/utilities/tagging_service.py
index 8c7a86f1d..c56fd2306 100644
--- a/moto/utilities/tagging_service.py
+++ b/moto/utilities/tagging_service.py
@@ -12,6 +12,9 @@ class TaggingService:
                 result.append({self.keyName: k, self.valueName: v})
         return {self.tagName: result}
 
+    def delete_all_tags_for_resource(self, arn):
+        del self.tags[arn]
+
     def tag_resource(self, arn, tags):
         if arn not in self.tags:
             self.tags[arn] = {}
diff --git a/tests/test_utilities/test_tagging_service.py b/tests/test_utilities/test_tagging_service.py
index 0d7db3e25..249e903fe 100644
--- a/tests/test_utilities/test_tagging_service.py
+++ b/tests/test_utilities/test_tagging_service.py
@@ -19,6 +19,7 @@ def test_create_tag():
 
     expected.should.be.equal(actual)
 
+
 def test_create_tag_without_value():
     svc = TaggingService()
     tags = [{"Key": "key_key"}]
@@ -28,6 +29,7 @@ def test_create_tag_without_value():
 
     expected.should.be.equal(actual)
 
+
 def test_delete_tag_using_names():
     svc = TaggingService()
     tags = [{"Key": "key_key", "Value": "value_value"}]
@@ -37,6 +39,19 @@ def test_delete_tag_using_names():
 
     {"Tags": []}.should.be.equal(result)
 
+
+def test_delete_all_tags_for_resource():
+    svc = TaggingService()
+    tags = [{"Key": "key_key", "Value": "value_value"}]
+    tags2 = [{"Key": "key_key2", "Value": "value_value2"}]
+    svc.tag_resource("arn", tags)
+    svc.tag_resource("arn", tags2)
+    svc.delete_all_tags_for_resource("arn")
+    result = svc.list_tags_for_resource("arn")
+
+    {"Tags": []}.should.be.equal(result)
+
+
 def test_list_empty_delete():
     svc = TaggingService()
     svc.untag_resource_using_names("arn", ["key_key"])
@@ -44,6 +59,7 @@ def test_list_empty_delete():
 
     {"Tags": []}.should.be.equal(result)
 
+
 def test_delete_tag_using_tags():
     svc = TaggingService()
     tags = [{"Key": "key_key", "Value": "value_value"}]
@@ -61,4 +77,3 @@ def test_extract_tag_names():
     expected = ["key1", "key2"]
 
     expected.should.be.equal(actual)
-