public function testCheckingKeyExistenceIsDelegatedToClient()
 {
     $this->mockClient->method('getResultCode')->willReturn(MemcachedKeyValueStore::MEMCACHED_RES_NOTFOUND);
     $this->assertFalse($this->store->has('foo'));
 }
 public function testFalseIsReturnedIfKeyDoesNotExist()
 {
     $this->assertFalse($this->keyValueStore->has('foo'));
 }