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in above implementation i lost of my `whenever` or `on` block.
because 
```
 repository.fetchWeather() willReturnSingle weatherData // this weatherData from fixture
                
                presenter.fetchWeather()
```
should be done in whenever or on block

1. What is `whenever`? There is a change you're calling Kotlin Mockito function by mistake
1. Highly recommend wrap `val`s into `memoized {}` to properly reset them for each test
1. What is `then`? Also looks like Kotlin Mockito

That only alias for `on` and `it` which I created. Those are not Mockito property.

That's make structure more elegant.

given {
   whenever {
       then {
       }
   }
}

instead of
given {
   on {
       it {
       }
   }
}


<https://github.com/spekframework/spek-android-example/blob/c8826153b49f991babbca45e58dff5be39476d36/app/src/test/kotlin/org/spekframework/speksample/SpekStandard.kt>

<@U0SAE2VGD> back to the topic. Which structure should I done within that case?