Include reason & message in API error when available

lib/google/apis/core/api_command.rb

@@ -94,11 +94,11 @@ def check_status(status, header = nil, body = nil, message = nil)
           when 400, 402...500
             error = parse_error(body)
             if error
-              message = error['reason'] if error.has_key?('reason')
+              message = sprintf('%s: %s', error['reason'], error['message'])
               raise Google::Apis::RateLimitError.new(message,
                                                      status_code: status,
                                                      header: header,
-                                                     body: body) if RATE_LIMIT_ERRORS.include?(message)
+                                                     body: body) if RATE_LIMIT_ERRORS.include?(error['reason'])
             end
             super(status, header, body, message)
           else

spec/google/apis/core/api_command_spec.rb

@@ -151,6 +151,41 @@
     end
   end
 
+  context('with a client error response') do
+    let(:command) do
+      Google::Apis::Core::ApiCommand.new(:get, 'https://www.googleapis.com/zoo/animals')
+    end
+
+    before(:example) do
+      json = <<EOF
+{
+ "error": {
+  "errors": [
+   {
+    "domain": "global",
+    "reason": "timeRangeEmpty",
+    "message": "The specified time range is empty."
+   }
+  ],
+  "code": 400,
+  "message": "The specified time range is empty."
+ }
+}
+EOF
+      stub_request(:get, 'https://www.googleapis.com/zoo/animals')
+        .to_return(status: [400, 'Bad Request'], headers: { 'Content-Type' => 'application/json' }, body: json)
+    end
+
+    it 'should raise client error' do
+      expect { command.execute(client) }.to raise_error(Google::Apis::ClientError)
+    end
+
+    it 'should raise an error with the reason and message' do
+      expect { command.execute(client) }.to raise_error(
+        /timeRangeEmpty: The specified time range is empty/)
+    end
+  end
+
   context('with an empty error body') do
     let(:command) do
       Google::Apis::Core::ApiCommand.new(:get, 'https://www.googleapis.com/zoo/animals')
@@ -166,5 +201,9 @@
     it 'should raise client error' do
       expect { command.execute(client) }.to raise_error(Google::Apis::ClientError)
     end
+
+    it 'should use the default error message' do
+      expect { command.execute(client) }.to raise_error(/Invalid request/)
+    end
   end
 end

spec/integration_tests/url_shortener_spec.rb

@@ -1,3 +1,17 @@
+# Copyright 2015 Google Inc.
+#
+# 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
+#
+#      http://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.
+
 require 'spec_helper'
 require 'google/apis/urlshortener_v1'
 require 'googleauth'