Media package client error (#3983)

* Add delete container and list tags endpoints to MediaStore

* Black reformat

* Fixed Lint problems

* Check if dictionary was deleted effectively

* lint fix

* MediaPackageClientError

* Lint Fix

* Test unknown channel describe

* Concatenation Fix

* MediaPackage - fix error message

Co-authored-by: av <arcovoltaico@gmail.com>
Co-authored-by: Bert Blommers <info@bertblommers.nl>

moto/mediapackage/exceptions.py

@@ -1 +1,13 @@
 from __future__ import unicode_literals
+
+from moto.core.exceptions import JsonRESTError
+
+
+class MediaPackageClientError(JsonRESTError):
+    code = 400
+
+
+# AWS service exceptions are caught with the underlying botocore exception, ClientError
+class ClientError(MediaPackageClientError):
+    def __init__(self, error, message):
+        super(ClientError, self).__init__(error, message)

moto/mediapackage/models.py

@@ -1,8 +1,12 @@
 from __future__ import unicode_literals
-from boto3 import Session
-from moto.core import BaseBackend, BaseModel
+
 from collections import OrderedDict
 
+from boto3 import Session
+
+from moto.core import BaseBackend, BaseModel
+from .exceptions import ClientError
+
 
 class Channel(BaseModel):
     def __init__(self, *args, **kwargs):
@@ -97,8 +101,12 @@ class MediaPackageBackend(BaseBackend):
         return response_channels
 
     def describe_channel(self, id):
-        channel = self._channels[id]
-        return channel.to_dict()
+        try:
+            channel = self._channels[id]
+            return channel.to_dict()
+        except KeyError:
+            error = "NotFoundException"
+            raise ClientError(error, "channel with id={} not found".format(id))
 
     def delete_channel(self, id):
         channel = self._channels[id]