tests: add system tests to check error details

tests/system/test_error_details.py

@@ -0,0 +1,78 @@
+# Copyright 2021 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License 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 pytest
+from google import showcase
+from google.rpc import error_details_pb2
+from google.protobuf import any_pb2
+from grpc_status import rpc_status
+from google.api_core import exceptions
+
+
+def create_status(error_details=None):
+    status = rpc_status.status_pb2.Status()
+    status.code = 3
+    status.message = (
+        "test"
+    )
+    status_detail = any_pb2.Any()
+    if error_details:
+        status_detail.Pack(error_details)
+    status.details.append(status_detail)
+    return status
+
+
+def test_bad_request_details(echo):
+    def create_bad_request_details():
+        bad_request_details = error_details_pb2.BadRequest()
+        field_violation = bad_request_details.field_violations.add()
+        field_violation.field = "test field"
+        field_violation.description = "test description"
+        return bad_request_details
+    bad_request_details = create_bad_request_details()
+    status = create_status(bad_request_details)
+
+    with pytest.raises(exceptions.GoogleAPICallError) as e:
+        _ = echo.echo(showcase.EchoRequest(
+            error=status,
+        ))
+        assert e.details == [bad_request_details]
+
+
+def test_precondition_failure_details(echo):
+    def create_precondition_failure_details():
+        pf_details = error_details_pb2.PreconditionFailure()
+        violation = pf_details.violations.add()
+        violation.type = "test type"
+        violation.subject = "test subject"
+        violation.description = "test description"
+        return pf_details
+
+    pf_details = create_precondition_failure_details()
+    status = create_status(pf_details)
+
+    with pytest.raises(exceptions.GoogleAPICallError) as e:
+        _ = echo.echo(showcase.EchoRequest(
+            error=status,
+        ))
+        assert e.details == [pf_details]
+
+
+def test_unknown_details(echo):
+    status = create_status()
+    with pytest.raises(exceptions.GoogleAPICallError) as e:
+        _ = echo.echo(showcase.EchoRequest(
+            error=status,
+        ))
+        assert e.details == status.details