public function testBuildsClients($serviceName, $expectedClient)
{
$serviceBuilder = new ServiceBuilder(['projectId' => 'myProject']);
$config = ['projectId' => 'myProject', 'scopes' => ['somescope'], 'httpHandler' => function () {
return;
}];
$globalConfigClient = $serviceBuilder->{$serviceName}();
$localConfigClient = $serviceBuilder->{$serviceName}($config);
$this->assertInstanceOf($expectedClient, $globalConfigClient);
$this->assertInstanceOf($expectedClient, $localConfigClient);
}