public function testFilterHeavyEntities()
 {
     $big_str = str_repeat('-', 5000);
     $this->obj2->setMetadata($this->name, array($big_str, $big_str));
     $guids = array($this->guid1, $this->guid2);
     $expected = array($this->guid1);
     $actual = $this->cache->filterMetadataHeavyEntities($guids, 6000);
     $this->assertIdentical($actual, $expected);
 }