Writing tests for the Flutter app

For the sake of consistency, we generally recommend keeping the same file organization in both the lib and test folders. This will guarantee a better mental order and allow you to quickly search for the tests when you need to work on them.

To get started, let’s create the main_test.dart file in the test folder and ensure it has the following contents:

import 'package:chapter_1/main.dart' as app_main;
void main() {
  group('Testing the root widget', () {
    testWidgets(      “Making sure that 'main()' doesn't throw”, 
        (tester) async {
        var throws = false;
        try {
          app_main.main();
        } catch...