add logs exceptions

tests/test_logs/test_logs.py

@@ -1,7 +1,9 @@
 import boto3
 import sure  # noqa
+from botocore.exceptions import ClientError
 
 from moto import mock_logs, settings
+from nose.tools import assert_raises
 
 _logs_region = 'us-east-1' if settings.TEST_SERVER_MODE else 'us-west-2'
 
@@ -12,3 +14,48 @@ def test_log_group_create():
     log_group_name = 'dummy'
     response = conn.create_log_group(logGroupName=log_group_name)
     response = conn.delete_log_group(logGroupName=log_group_name)
+
+
+@mock_logs
+def test_exceptions():
+    conn = boto3.client('logs', 'us-west-2')
+    log_group_name = 'dummy'
+    log_stream_name = 'dummp-stream'
+    conn.create_log_group(logGroupName=log_group_name)
+    with assert_raises(ClientError):
+        conn.create_log_group(logGroupName=log_group_name)
+
+    # descrine_log_groups is not implemented yet
+
+    conn.create_log_stream(
+        logGroupName=log_group_name,
+        logStreamName=log_stream_name
+    )
+    with assert_raises(ClientError):
+        conn.create_log_stream(
+            logGroupName=log_group_name,
+            logStreamName=log_stream_name
+        )
+
+    conn.put_log_events(
+        logGroupName=log_group_name,
+        logStreamName=log_stream_name,
+        logEvents=[
+            {
+                'timestamp': 0,
+            'message': 'line'
+            },
+        ],
+    )
+
+    with assert_raises(ClientError):
+        conn.put_log_events(
+            logGroupName=log_group_name,
+            logStreamName="invalid-stream",
+            logEvents=[
+                {
+                    'timestamp': 0,
+                    'message': 'line'
+                },
+            ],
+        )