public function testNamespaceIsCacheable()
 {
     $options = new CacheOptions();
     $cacheManger = new CacheManager($options);
     $this->assertFalse($cacheManger->isCacheable('hello'));
     $options->setEnabled(true);
     $this->assertTrue($cacheManger->isCacheable('hello'));
     $options->setNamespaces(['stuff']);
     $this->assertTrue($cacheManger->isCacheable('stuff'));
     $this->assertFalse($cacheManger->isCacheable('another_stuff'));
 }