Add support and unittests for Route53 tags

moto/route53/models.py

@@ -1,5 +1,7 @@
 from __future__ import unicode_literals
 
+from collections import defaultdict
+
 import uuid
 from jinja2 import Template
 
@@ -226,6 +228,7 @@ class Route53Backend(BaseBackend):
     def __init__(self):
         self.zones = {}
         self.health_checks = {}
+        self.resource_tags = defaultdict(dict)
 
     def create_hosted_zone(self, name, private_zone, comment=None):
         new_id = get_random_hex()
@@ -233,6 +236,25 @@ class Route53Backend(BaseBackend):
         self.zones[new_id] = new_zone
         return new_zone
 
+    def change_tags_for_resource(self, resource_id, tags):
+        if 'Tag' in tags:
+            for key, tag in tags.items():
+                for t in tag:
+                    self.resource_tags[resource_id][t['Key']] = t['Value']
+
+        else:
+            for _, keys in tags.items():
+                if isinstance(keys, list):
+                    for key in keys:
+                        del(self.resource_tags[resource_id][key])
+                else:
+                        del(self.resource_tags[resource_id][keys])
+
+
+    def list_tags_for_resource(self, resource_id):
+        if resource_id in self.resource_tags:
+            return self.resource_tags[resource_id]
+
     def get_all_hosted_zones(self):
         return self.zones.values()