public static function _missing_version(array $args)
    {
        $service = isset($args['service']) ? $args['service'] : '';
        $versions = ApiProvider::defaultProvider()->getVersions($service);
        $versions = implode("\n", array_map(function ($v) {
            return "* \"{$v}\"";
        }, $versions)) ?: '* (none found)';
        return <<<EOT
A "version" configuration value is required. Specifying a version constraint
ensures that your code will not be affected by a breaking change made to the
service. For example, when using Vws Blackbox, you can lock your API version to
"2015-01-01".

Your build of the Sdk has the following version(s) of "{$service}": {$versions}

You may provide "latest" to the "version" configuration value to utilize the
most recent available API version that your client's API provider can find.
Note: Using 'latest' in a production application is not recommended '.
EOT;
    }
 public function testCanGetDefaultProvider()
 {
     $p = ApiProvider::defaultProvider();
     $this->assertArrayHasKey('webapi', $this->readAttribute($p, 'manifest'));
 }