Fix cloudformation subnet tagging.

moto/ec2/models.py

@@ -1715,6 +1715,11 @@ class Subnet(TaggedEC2Resource):
             cidr_block=cidr_block,
             availability_zone=availability_zone,
         )
+        for tag in properties.get("Tags", []):
+            tag_key = tag["Key"]
+            tag_value = tag["Value"]
+            subnet.add_tag(tag_key, tag_value)
+
         return subnet
 
     @property

tests/test_ec2/test_subnets.py

@@ -1,14 +1,15 @@
 from __future__ import unicode_literals
 # Ensure 'assert_raises' context manager support for Python 2.6
-import tests.backport_assert_raises
+import tests.backport_assert_raises  # noqa
 from nose.tools import assert_raises
 
 import boto
 import boto.vpc
 from boto.exception import EC2ResponseError
+import json
 import sure  # noqa
 
-from moto import mock_ec2
+from moto import mock_cloudformation, mock_ec2
 
 
 @mock_ec2
@@ -116,3 +117,41 @@ def test_get_subnets_filtering():
 
     # Unsupported filter
     conn.get_all_subnets.when.called_with(filters={'not-implemented-filter': 'foobar'}).should.throw(NotImplementedError)
+
+
+@mock_ec2
+@mock_cloudformation
+def test_subnet_tags_through_cloudformation():
+    vpc_conn = boto.vpc.connect_to_region('us-west-1')
+    vpc = vpc_conn.create_vpc("10.0.0.0/16")
+
+    subnet_template = {
+        "AWSTemplateFormatVersion": "2010-09-09",
+        "Resources": {
+            "testSubnet": {
+                "Type": "AWS::EC2::Subnet",
+                "Properties": {
+                    "VpcId": vpc.id,
+                    "CidrBlock": "10.0.0.0/24",
+                    "AvailabilityZone": "us-west-1b",
+                    "Tags": [{
+                        "Key": "foo",
+                        "Value": "bar",
+                    }, {
+                        "Key": "blah",
+                        "Value": "baz",
+                    }]
+                }
+            }
+        }
+    }
+    cf_conn = boto.cloudformation.connect_to_region("us-west-1")
+    template_json = json.dumps(subnet_template)
+    cf_conn.create_stack(
+        "test_stack",
+        template_body=template_json,
+    )
+
+    subnet = vpc_conn.get_all_subnets(filters={'cidrBlock': '10.0.0.0/24'})[0]
+    subnet.tags["foo"].should.equal("bar")
+    subnet.tags["blah"].should.equal("baz")