public function testDeleteItems()
{
$prefix = 'ns';
$key0 = 'key0';
$key1 = 'key1';
$returnValue = true;
$stub = $this->getHierarchyCacheStub();
$stub->expects($this->once())->method('deleteItems')->with([$prefix . $key0, $prefix . $key1])->willReturn($returnValue);
$pool = new PrefixedCachePool($stub, $prefix);
$this->assertEquals($returnValue, $pool->deleteItems([$key0, $key1]));
}