f_card_swiper/test/card_swiper_controller_test.dart

import 'package:flutter/material.dart';
import 'package:flutter_card_swiper/flutter_card_swiper.dart';
import 'package:flutter_test/flutter_test.dart';

import 'utils.dart';

void main() {
  group('CardSwiperController', () {
    test('swipe() should change the state to swipe', () {
      final controller = CardSwiperController();
      controller.swipe();
      expect(controller.state, CardSwiperState.swipe);
    });

    test('swipeLeft() should change the state to swipeLeft', () {
      final controller = CardSwiperController();
      controller.swipeLeft();
      expect(controller.state, CardSwiperState.swipeLeft);
    });

    test('swipeRight() should change the state to swipeRight', () {
      final controller = CardSwiperController();
      controller.swipeRight();
      expect(controller.state, CardSwiperState.swipeRight);
    });

    test('swipeTop() should change the state to swipeTop', () {
      final controller = CardSwiperController();
      controller.swipeTop();
      expect(controller.state, CardSwiperState.swipeTop);
    });

    test('swipeBottom() should change the state to swipeBottom', () {
      final controller = CardSwiperController();
      controller.swipeBottom();
      expect(controller.state, CardSwiperState.swipeBottom);
    });

    test('undo() changes state to undo', () {
      final controller = CardSwiperController();
      controller.undo();
      expect(controller.state, CardSwiperState.undo);
    });

    testWidgets('swipe() should swipe the card to the defined direction',
        (tester) async {
      final controller = CardSwiperController();
      final swiperKey = GlobalKey();
      var direction = CardSwiperDirection.none;

      await tester.pumpWidget(
        MaterialApp(
          home: CardSwiper(
            key: swiperKey,
            controller: controller,
            cardsCount: 10,
            cardBuilder: genericBuilder,
            direction: CardSwiperDirection.top,
            onSwipe: (oldIndex, currentIndex, swipeDirection) {
              direction = swipeDirection;
              return true;
            },
          ),
        ),
      );

      controller.swipe();
      await tester.pumpAndSettle();

      expect(direction, CardSwiperDirection.top);
    });

    testWidgets('swipeLeft() should swipe the card to the left',
        (tester) async {
      final controller = CardSwiperController();
      final swiperKey = GlobalKey();
      var direction = CardSwiperDirection.none;

      await tester.pumpWidget(
        MaterialApp(
          home: CardSwiper(
            key: swiperKey,
            controller: controller,
            cardsCount: 10,
            cardBuilder: genericBuilder,
            direction: CardSwiperDirection.left,
            onSwipe: (oldIndex, currentIndex, swipeDirection) {
              direction = swipeDirection;
              return true;
            },
          ),
        ),
      );

      controller.swipeLeft();
      await tester.pumpAndSettle();

      expect(direction, CardSwiperDirection.left);
    });

    testWidgets('swipeRight() should swipe the card to the right',
        (tester) async {
      final controller = CardSwiperController();
      final swiperKey = GlobalKey();
      var direction = CardSwiperDirection.none;

      await tester.pumpWidget(
        MaterialApp(
          home: CardSwiper(
            key: swiperKey,
            controller: controller,
            cardsCount: 10,
            cardBuilder: genericBuilder,
            onSwipe: (oldIndex, currentIndex, swipeDirection) {
              direction = swipeDirection;
              return true;
            },
          ),
        ),
      );

      controller.swipeRight();
      await tester.pumpAndSettle();

      expect(direction, CardSwiperDirection.right);
    });

    testWidgets('swipeTop() should swipe the card to the top', (tester) async {
      final controller = CardSwiperController();
      final swiperKey = GlobalKey();
      var direction = CardSwiperDirection.none;

      await tester.pumpWidget(
        MaterialApp(
          home: CardSwiper(
            key: swiperKey,
            controller: controller,
            cardsCount: 10,
            cardBuilder: genericBuilder,
            direction: CardSwiperDirection.top,
            onSwipe: (oldIndex, currentIndex, swipeDirection) {
              direction = swipeDirection;
              return true;
            },
          ),
        ),
      );

      controller.swipeTop();
      await tester.pumpAndSettle();

      expect(direction, CardSwiperDirection.top);
    });

    testWidgets('swipeBottom() should swipe the card to the bottom',
        (tester) async {
      final controller = CardSwiperController();
      final swiperKey = GlobalKey();
      var direction = CardSwiperDirection.none;

      await tester.pumpWidget(
        MaterialApp(
          home: CardSwiper(
            key: swiperKey,
            controller: controller,
            cardsCount: 10,
            cardBuilder: genericBuilder,
            direction: CardSwiperDirection.bottom,
            onSwipe: (oldIndex, currentIndex, swipeDirection) {
              direction = swipeDirection;
              return true;
            },
          ),
        ),
      );

      controller.swipeBottom();
      await tester.pumpAndSettle();

      expect(direction, CardSwiperDirection.bottom);
    });

    group('undo()', () {
      testWidgets('should undo the last swipe', (tester) async {
        final controller = CardSwiperController();

        await tester.pumpWidget(
          MaterialApp(
            home: CardSwiper(
              controller: controller,
              cardsCount: 10,
              cardBuilder: genericBuilder,
            ),
          ),
        );

        controller.swipe();
        await tester.pumpAndSettle();

        expect(find.text(getIndexText(1)), findsOneWidget);

        controller.undo();
        await tester.pumpAndSettle();

        expect(find.text(getIndexText(0)), findsOneWidget);
      });

      testWidgets('should undo the last swipe left', (tester) async {
        final controller = CardSwiperController();
        var direction = CardSwiperDirection.none;

        await tester.pumpWidget(
          MaterialApp(
            home: CardSwiper(
              controller: controller,
              cardsCount: 10,
              cardBuilder: genericBuilder,
              onUndo: (_, __, swipeDirection) {
                direction = swipeDirection;
                return true;
              },
            ),
          ),
        );

        controller.swipeLeft();
        await tester.pumpAndSettle();

        expect(find.text(getIndexText(1)), findsOneWidget);

        controller.undo();
        await tester.pumpAndSettle();

        expect(find.text(getIndexText(0)), findsOneWidget);
        expect(direction, CardSwiperDirection.left);
      });

      testWidgets('should undo the last swipe right', (tester) async {
        final controller = CardSwiperController();
        var direction = CardSwiperDirection.none;

        await tester.pumpWidget(
          MaterialApp(
            home: CardSwiper(
              controller: controller,
              cardsCount: 10,
              cardBuilder: genericBuilder,
              onUndo: (_, __, swipeDirection) {
                direction = swipeDirection;
                return true;
              },
            ),
          ),
        );

        controller.swipeRight();
        await tester.pumpAndSettle();

        expect(find.text(getIndexText(1)), findsOneWidget);

        controller.undo();
        await tester.pumpAndSettle();

        expect(find.text(getIndexText(0)), findsOneWidget);
        expect(direction, CardSwiperDirection.right);
      });

      testWidgets('should undo the last swipe top', (tester) async {
        final controller = CardSwiperController();
        var direction = CardSwiperDirection.none;

        await tester.pumpWidget(
          MaterialApp(
            home: CardSwiper(
              controller: controller,
              cardsCount: 10,
              cardBuilder: genericBuilder,
              onUndo: (_, __, swipeDirection) {
                direction = swipeDirection;
                return true;
              },
            ),
          ),
        );

        controller.swipeTop();
        await tester.pumpAndSettle();

        expect(find.text(getIndexText(1)), findsOneWidget);

        controller.undo();
        await tester.pumpAndSettle();

        expect(find.text(getIndexText(0)), findsOneWidget);
        expect(direction, CardSwiperDirection.top);
      });

      testWidgets('should undo the last swipe bottom', (tester) async {
        final controller = CardSwiperController();
        var direction = CardSwiperDirection.none;

        await tester.pumpWidget(
          MaterialApp(
            home: CardSwiper(
              controller: controller,
              cardsCount: 10,
              cardBuilder: genericBuilder,
              onUndo: (_, __, swipeDirection) {
                direction = swipeDirection;
                return true;
              },
            ),
          ),
        );

        controller.swipeBottom();
        await tester.pumpAndSettle();

        expect(find.text(getIndexText(1)), findsOneWidget);

        controller.undo();
        await tester.pumpAndSettle();

        expect(find.text(getIndexText(0)), findsOneWidget);
        expect(direction, CardSwiperDirection.bottom);
      });

      testWidgets('should not undo if onUndo returns false', (tester) async {
        final controller = CardSwiperController();

        await tester.pumpWidget(
          MaterialApp(
            home: CardSwiper(
              controller: controller,
              cardsCount: 10,
              cardBuilder: genericBuilder,
              onUndo: (_, __, swipeDirection) {
                return false;
              },
            ),
          ),
        );

        controller.swipe();
        await tester.pumpAndSettle();

        controller.undo();
        await tester.pumpAndSettle();

        expect(find.text(getIndexText(0)), findsNothing);
      });
    });
  });
}