adds tagging support for cloudwatch events service

tests/test_events/test_events.py

@@ -5,8 +5,10 @@ import sure  # noqa
 
 from moto.events import mock_events
 from botocore.exceptions import ClientError
+from moto.core.exceptions import JsonRESTError
 from nose.tools import assert_raises
 from moto.core import ACCOUNT_ID
+from moto.events.models import EventsBackend
 
 RULES = [
     {"Name": "test1", "ScheduleExpression": "rate(5 minutes)"},
@@ -136,14 +138,6 @@ def test_list_rule_names_by_target():
         assert rule in test_2_target["Rules"]
 
 
-@mock_events
-def test_list_rules():
-    client = generate_environment()
-
-    rules = client.list_rules()
-    assert len(rules["Rules"]) == len(RULES)
-
-
 @mock_events
 def test_delete_rule():
     client = generate_environment()
@@ -461,3 +455,43 @@ def test_delete_event_bus_errors():
     client.delete_event_bus.when.called_with(Name="default").should.throw(
         ClientError, "Cannot delete event bus default."
     )
+
+@mock_events
+def test_rule_tagging_happy():
+    client = generate_environment()
+    rule_name = get_random_rule()["Name"]
+    rule_arn = client.describe_rule(Name=rule_name).get("Arn")
+
+    tags = [{"Key": "key1", "Value": "value1"}, {"Key": "key2", "Value": "value2"}]
+    client.tag_resource(ResourceARN=rule_arn, Tags=tags)
+
+    actual = client.list_tags_for_resource(ResourceARN=rule_arn).get("Tags")
+    assert tags == actual
+
+    client.untag_resource(ResourceARN=rule_arn, TagKeys=["key1"])
+
+    actual = client.list_tags_for_resource(ResourceARN=rule_arn).get("Tags")
+    expected = [{"Key": "key2", "Value": "value2"}]
+    assert expected == actual
+
+@mock_events
+def test_rule_tagging_sad():
+    b = EventsBackend("us-west-2")
+
+    try:
+        b.tag_resource('unknown', [])
+        raise 'tag_resource should fail if ResourceARN is not known'
+    except JsonRESTError:
+        pass
+
+    try:
+        b.untag_resource('unknown', [])
+        raise 'untag_resource should fail if ResourceARN is not known'
+    except JsonRESTError:
+        pass
+
+    try:
+        b.list_tags_for_resource('unknown')
+        raise 'list_tags_for_resource should fail if ResourceARN is not known'
+    except JsonRESTError:
+        pass

tests/test_utilities/test_tagging_service.py

@@ -0,0 +1,53 @@
+import unittest
+
+from moto.utilities.tagging_service import TaggingService
+
+
+class TestTaggingService(unittest.TestCase):
+    def test_list_empty(self):
+        svc = TaggingService()
+        result = svc.list_tags_for_resource('test')
+        self.assertEqual(result, {'Tags': []})
+
+    def test_create_tag(self):
+        svc = TaggingService('TheTags', 'TagKey', 'TagValue')
+        tags = [{'TagKey': 'key_key', 'TagValue': 'value_value'}]
+        svc.tag_resource('arn', tags)
+        actual = svc.list_tags_for_resource('arn')
+        expected = {'TheTags': [{'TagKey': 'key_key', 'TagValue': 'value_value'}]}
+        self.assertDictEqual(expected, actual)
+
+    def test_create_tag_without_value(self):
+        svc = TaggingService()
+        tags = [{'Key': 'key_key'}]
+        svc.tag_resource('arn', tags)
+        actual = svc.list_tags_for_resource('arn')
+        expected = {'Tags': [{'Key': 'key_key', 'Value': ''}]}
+        self.assertDictEqual(expected, actual)
+
+    def test_delete_tag(self):
+        svc = TaggingService()
+        tags = [{'Key': 'key_key', 'Value': 'value_value'}]
+        svc.tag_resource('arn', tags)
+        svc.untag_resource('arn', ['key_key'])
+        result = svc.list_tags_for_resource('arn')
+        self.assertEqual(
+            result, {'Tags': []})
+
+    def test_list_empty_delete(self):
+        svc = TaggingService()
+        svc.untag_resource('arn', ['key_key'])
+        result = svc.list_tags_for_resource('arn')
+        self.assertEqual(
+            result, {'Tags': []})
+
+    def test_extract_tag_names(self):
+        svc = TaggingService()
+        tags = [{'Key': 'key1', 'Value': 'value1'}, {'Key': 'key2', 'Value': 'value2'}]
+        actual = svc.extract_tag_names(tags)
+        expected = ['key1', 'key2']
+        self.assertEqual(expected, actual)
+
+
+if __name__ == '__main__':
+    unittest.main()