SNS - Enforce 'Message too long' exception when publishing messages

tests/test_sns/test_publishing_boto3.py

@@ -10,6 +10,7 @@ import sure  # noqa
 
 import responses
 from botocore.exceptions import ClientError
+from nose.tools import assert_raises
 from moto import mock_sns, mock_sqs
 
 
@@ -308,6 +309,20 @@ def test_publish_subject():
         raise RuntimeError('Should have raised an InvalidParameter exception')
 
 
+@mock_sns
+def test_publish_message_too_long():
+    sns = boto3.resource('sns', region_name='us-east-1')
+    topic = sns.create_topic(Name='some-topic')
+
+    with assert_raises(ClientError):
+        topic.publish(
+            Message="".join(["." for i in range(0, 262145)]))
+
+    # message short enough - does not raise an error
+    topic.publish(
+        Message="".join(["." for i in range(0, 262144)]))
+
+
 def _setup_filter_policy_test(filter_policy):
     sns = boto3.resource('sns', region_name='us-east-1')
     topic = sns.create_topic(Name='some-topic')