public function testGetItem() { $prefix = 'ns'; $key = 'key'; $returnValue = true; $stub = $this->getHierarchyCacheStub(); $stub->expects($this->once())->method('getItem')->with($prefix . $key)->willReturn($returnValue); $pool = new PrefixedCachePool($stub, $prefix); $this->assertEquals($returnValue, $pool->getItem($key)); }