public function testSaveBlock()
 {
     $key = sha1(rand());
     $block = sha1(rand());
     $this->cacheStrategy->method('saveBlock')->will($this->returnCallback(function ($a, $b) use($key, $block) {
         $this->assertSame($key, $a);
         $this->assertSame($block, $b);
     }));
     $this->object->saveBlock($key, $block);
 }