Modularizing Legacy Projects Using TDD by Khaled El-Morabea & Hassaan El-Garem

Author:Khaled El-Morabea & Hassaan El-Garem
Language: eng
Format: epub
ISBN: 9781484274286
Publisher: Apress

If you recall, we used this approach in Chapter 6 when we were writing tests for MainViewModel. MainViewModel depended on NetworkLayer, so we created NetworkLayerStub using inheritance. And it looked like this :class NetworkLayerStub: NetworkLayer {

var stubbedData:Data?

init(stubbedData:Data) {

self.stubbedData = stubbedData

}

public override func executeNetworkRequest(callBack: @escaping (_ data:Data?) -> Void){

let jsonData = self.stubbedData!

callBack(jsonData)

}

}

We inherit from NetworkLayer, and we override executeNetworkRequest and make it return stubbedData instead of actually making a network request. We set stubbedData from our tests as needed.

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