cpd/test/widget_testing/addhabit_popup_test.dart

import 'package:cpd/database/todo_db.dart';
import 'package:cpd/pages/iconpage.dart';
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:cpd/widgets/addhabit_popup.dart';
import 'package:mockito/mockito.dart';
import 'package:sqflite_common_ffi/sqflite_ffi.dart';

class MockTodoDB extends Mock implements TodoDB {}

void main() {
  setUpAll(() {
    sqfliteFfiInit();
    databaseFactory = databaseFactoryFfi;
  });

  testWidgets('AddHabitPopup Dialog contains all of the UI-elements', (WidgetTester tester) async {
    await tester.pumpWidget(MaterialApp(
      home: Scaffold(
        body: AddHabitPopup(
          onSubmit: (title, subtitle, icon) {},
        ),
      ),
    ));

    expect(find.text('Add task'), findsOneWidget);

    await tester.enterText(find.byType(TextFormField).at(0), 'New Habit Title');
    await tester.enterText(find.byType(TextFormField).at(1), 'New Habit Description');

    await tester.pumpAndSettle();

    final saveButtonFinder = find.byKey(const Key('Save'));
    expect(saveButtonFinder, findsOneWidget);

    await tester.tap(saveButtonFinder);
    await tester.pumpAndSettle();

    IconData newIcon = Icons.star;

    await tester.tap(find.text('Select Icon'));
    await tester.pumpAndSettle();

    (tester.firstWidget(find.byType(IconPage)) as IconPage).onIconSelected(newIcon);
    await tester.pumpAndSettle();

    expect(find.byIcon(newIcon), findsOneWidget);
    await tester.pumpAndSettle();
  });
}