Fix cloudwatch logs' response error (#1426)

tests/test_logs/test_logs.py

@@ -59,3 +59,30 @@ def test_exceptions():
                 },
             ],
         )
+
+
+@mock_logs
+def test_put_logs():
+    conn = boto3.client('logs', 'us-west-2')
+    log_group_name = 'dummy'
+    log_stream_name = 'stream'
+    conn.create_log_group(logGroupName=log_group_name)
+    conn.create_log_stream(
+        logGroupName=log_group_name,
+        logStreamName=log_stream_name
+    )
+    messages = [
+        {'timestamp': 0, 'message': 'hello'},
+        {'timestamp': 0, 'message': 'world'}
+    ]
+    conn.put_log_events(
+        logGroupName=log_group_name,
+        logStreamName=log_stream_name,
+        logEvents=messages
+    )
+    res = conn.get_log_events(
+        logGroupName=log_group_name,
+        logStreamName=log_stream_name
+    )
+    events = res['events']
+    events.should.have.length_of(2)