cpd/test/widget_testing/edithabit_dialog_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/database/habit.dart';
import 'package:cpd/widgets/edithabit_dialog.dart';
import 'package:sqflite_common_ffi/sqflite_ffi.dart';

void main() {

  final TodoDB todoDb = TodoDB();

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

  testWidgets('EditHabitDialog contains all of the ui-elements', (WidgetTester tester) async {
    final habit = Habit(
      id: 1,
      title: 'Existing Habit',
      subtitle: 'Existing Description',
      iconCodePoint: Icons.star.codePoint,
      iconFontFamily: Icons.star.fontFamily ?? 'MaterialIcons',
      isComplete: false,
    );

    await tester.pumpWidget(MaterialApp(
      home: Scaffold(
        body: EditHabitDialog(
          todo: habit,
          todoDB: todoDb,
          fetchTodos: (){},
        ),
      ),
    ));

    expect(find.text('Edit Habit'), findsOneWidget);
    expect(find.text('Existing Habit'), findsOneWidget);
    expect(find.text('Existing Description'), 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.tap(find.byIcon(Icons.star));
    await tester.pumpAndSettle();

    IconData newIcon = Icons.code;
    (tester.firstWidget(find.byType(IconPage)) as IconPage).onIconSelected(newIcon);
    await tester.tap(find.byIcon(newIcon));
    await tester.pumpAndSettle();

    final saveButtonFinder = find.widgetWithText(TextButton, 'Save');
    expect(saveButtonFinder, findsOneWidget);
    await tester.tap(saveButtonFinder);
    await tester.pumpAndSettle();
  });
}