/**
  * @covers ::sandbox
  * @covers ::getEndpoint
  */
 public function testSandbox()
 {
     $client = new Client('aaaaa', 'bbbbb');
     $client->sandbox(true);
     $this->assertEquals($client::API_ENDPOINT_SANDBOX . $client::API_VERSION . '/aaaaa/bar', $client->getEndpoint('bar'));
     $client->sandbox(false);
     $this->assertEquals($client::API_ENDPOINT . $client::API_VERSION . '/aaaaa/baz', $client->getEndpoint('baz'));
 }