The actual app is made by DennisRein. This repository just displays how to test a flutter app

This is also supposed to be the handout. I didn't convert this to Pdf because converters are not so good with code. So enjoy markdown. The full tutorial is Flutter_Testing.pdf.

1. Install flutter -> https://flutter.dev/docs/get-started/install
2. Install Android Studio and the android sdk -> https://developer.android.com/studio/install
3. Get a device to run the tests
   • Run on a emulator -> https://developer.android.com/studio/run/emulator
   • Run on your own device -> https://developer.android.com/studio/run
4. Add the following plugins to your pubspec.yml and run pub get

dev_dependencies:
  flutter_test:
    sdk: flutter
  flutter_driver:
    sdk: flutter
  test: any

• All tests have to be in the test folder
• All tests have to end with _test.dart
• All test files must have a main function
• Compare values with the expect function
• Set up and clean up with setUp and teardown
• Consider the following code for reference

import 'package:flutter_test/flutter_test.dart';
import 'package:sepokedex/model.dart';

void main() async {
  Pokemon pokemon;

  setUp(() {
    print('I run before each and every test');
  });

  setUpAll(() {
    print('I run once before everything else');
  });

  tearDown(() {
    print('I run after each test');
  });

  group('group', () {

    tearDownAll(() {
      print('I run once after this group');
    });

    test('has the correct name', () async {
      int sum = 1 + 2;

      expect(sum, 3);
    });

  });
}

• Execute tests from your flutter root with the command

flutter test

• If you want code coverage. Visualized on codacy

flutter test --coverage

• All tests have to be in the test_driver folder
• Each test consists out of two files
  • A file called like you want. E.g app.dart
  • A test file called app_test.dart

app.dart contains everything to execute the test. It sets up the test and runs the app. Minimal file is as follows.

import 'package:flutter_driver/driver_extension.dart';
import 'package:sepokedex/main.dart' as app;

void main() {
  // Enable the flutter driver extension to run and capture tests
  enableFlutterDriverExtension();

  // Configure things here before the app is launched.

  // Execute the main app
  app.main();
}

app_test.dart contains the tests you want to execute on your app. Structure is similar to an unit test.

• In order to find a widget you have to give it a key

Align(
    alignment: Alignment.centerLeft,
    child: Text(
        pokemon.name,
        key: Key('pokemonName'),
        style:
            Theme.of(context).textTheme.headline1.copyWith(fontSize: 72),
    ),
),

• Then use the method byValueKey of the built-in object finder

final pokemonName = find.byValueKey('pokemonName');

• Tap it

await driver.tap(firstPokemon);

• Write to anything that is a text field and currently focused

driver.enterText('Text to enter')

flutter drive --target=test_driver/app.dart