public function setUp()
{
$this->connection = $this->prophesize(ConnectionInterface::class);
$this->operation = $this->prophesize(Operation::class);
$this->client = new DatastoreClientStub();
$this->client->setConnection($this->connection->reveal());
$this->key = new Key('my-awesome-project', [['path' => [['kind' => 'Person', 'name' => 'Bob']]]]);
}