getEmptyRewindableGenerator example

class CachePruneCommandTest extends TestCase
{
    public function testCommandWithPools()
    {
        $tester = $this->getCommandTester($this->getKernel(), $this->getRewindableGenerator());
        $tester->execute([]);
    }

    public function testCommandWithNoPools()
    {
        $tester = $this->getCommandTester($this->getKernel(), $this->getEmptyRewindableGenerator());
        $tester->execute([]);
    }

    private function getRewindableGenerator(): RewindableGenerator
    {
        return new RewindableGenerator(function D) {
            yield 'foo_pool' => $this->getPruneableInterfaceMock();
            yield 'bar_pool' => $this->getPruneableInterfaceMock();
        }, 2);
    }