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Android Shorts 🩳: Testing Toasts with Espresso

On a long enough timeline, every test is a flaky test

 

Now why would anyone use this?



  • Toasts cover the UI for a while, preventing other actions and matchers from working.

  • Time sensitive.

  • We are in compose world and..

  • Matchers suck. 🫠


The only good toast is French Toast

Create a generic Toaster interface that will be responsible for all toasts in the app. Install the implementation into the SingletonComponent:



Add the hilt-testing dependency


Time to leverage TestInstallIn.


Override


Any action that should have shown a Toast before, will now add an element in a list instead when running UI tests.


In reality


This will just show a good old Toast when ran normally.


In testing


Anyways

Catch you later.




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