How to unit test your Flutter loading widgets

Have you ever asked how could you test your loading Widgets the good way? We’ll try to answer this question in this article.

Let’s create a basic example building this simple page.

To check if the CircularProgressIndicator is drawn, I think we all have started this way.

Running this code, we face an issue :

After pumping our testing widget, we have to call pumpAndSettle to ensure every sub widgets have been drawn. Here, CircularProgressIndicator is constantly redrawing so that pumpAndSettle timed out.

So, what’s the solution?

CircularProgressIndicator has a value property that can be set to prevent this constant rebuilding. We could add an argument to LoadingPage to set the value to 0 so that the tests succeed.

In our test, we just have to add (isLoading:false) to LoadingPage and we’re good ! The test passed.

But now, what if I tell you that there is a way to remove this ugly isLoading parameter?

To get rid of the isLoading parameter, we’ll use the Platform.environment object that is available with dart:io.

We’ll create a mixin so that we can easily use it in every loading Widgets we’ll use.

And now we just have to change our LoadingPage to use it.

And voilà, we remove the isLoadingParameter and we can run our fist test without any problem.

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