public function testUpdateStatement()
 {
     $database = new Database($this->getCredentials());
     $database->statement("UPDATE simple_table SET name = :name WHERE id = :id", [':name' => 'update test', ':id' => 2])->then(function ($result) {
         // Expect a true result.
         $this->assertTrue($result);
     })->done();
     $database->shuttingDown = true;
     $database->loop->run();
 }