1, 'defaultRegion' => 'us-west-2', 'testCases' => [['operationName' => 'DescribeRegions', 'input' => [], 'errorExpectedFromService' => \false], ['operationName' => 'DescribeInstances', 'input' => ['InstanceIds' => ['i-12345678']], 'errorExpectedFromService' => \true]]];