public function testFindAllShouldReturnAllClients()
 {
     $newClient1 = new Client('foo');
     $newClient2 = new Client('bar');
     $addedClient1 = $this->repository->add($newClient1);
     $addedClient2 = $this->repository->add($newClient2);
     $this->assertEquals([f\get($addedClient1, 'id') => $addedClient1, f\get($addedClient2, 'id') => $addedClient2], $this->repository->findAll());
 }