Create test_cloudwatch.py

Add ambiguous error test

Author: SamRemis

tests/integration/botocore/test_cloudwatch.py

@@ -0,0 +1,39 @@
+# Copyright 2025 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"). You
+# may not use this file except in compliance with the License. A copy of
+# the License is located at
+#
+# http://aws.amazon.com/apache2.0/
+#
+# or in the "license" file accompanying this file. This file is
+# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
+# ANY KIND, either express or implied. See the License for the specific
+# language governing permissions and limitations under the License.
+
+
+import botocore.session
+from botocore.exceptions import ClientError
+
+
+def test_ambiguous_error_parsing():
+    # We map errors from services to modeled errors based on the error code, but
+    # cloudwatch has two errors that are both modeled to the `ResourceNotFound`
+    # code: `DashboardNotFoundError` and `ResourceNotFound`.  Botocore picks the one
+    # that is defined later, which in this case is `ResourceNotFound`.  This test
+    # ensures that we continue to select the latter error going forward.
+    session = botocore.session.get_session()
+    client = session.create_client('cloudwatch', region_name='us-west-2')
+    try:
+        client.get_dashboard(DashboardName='dashboard-which-does-not-exist')
+        assert False, "No error raised for non-existant dashboard"
+    except Exception as exception:
+        exception_class = exception.__class__
+        error_response = exception.response['Error']
+        assert isinstance(exception, ClientError)
+        assert (
+            f"{exception_class.__module__}.{exception_class.__name__}"
+            == 'botocore.errorfactory.ResourceNotFound'
+        )
+        assert error_response['Type'] == 'Sender'
+        assert error_response['Code'] == 'ResourceNotFound'