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