How can i past a double to a class contructor?

the following doesnt' work
```
$ck = test::double(CacheKey::class, [ 'track' => null,])->make();

$cityConfigProvider = new CityConfigProvider($cityConfigBuilder, $ck); // failed for $ck is not an instance of CacheKey
$ck->verifyInvoked('track');

$value = $cityConfigProvider->get($cityId, 'wechat_app_Id');
```