48 lines
1.4 KiB
Dart
48 lines
1.4 KiB
Dart
import 'package:flutter_card_swiper/src/undoable.dart';
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import 'package:flutter_test/flutter_test.dart';
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void main() {
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test('when defined the initial value expect to store and retrieve state', () {
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final undoable = Undoable<int>(0);
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expect(undoable.state, equals(0));
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expect(undoable.previousState, isNull);
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});
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test('when state is changed expect to store previous state', () {
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final undoable = Undoable<int>(0);
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undoable.state = 1;
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expect(undoable.state, equals(1));
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expect(undoable.previousState, equals(0));
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});
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test('when state is changed multiple times expect to store previous state',
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() {
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final undoable = Undoable<int>(0);
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undoable.state = 1;
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undoable.state = 2;
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expect(undoable.state, equals(2));
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expect(undoable.previousState, equals(1));
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});
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test('when undo is called expect to return previous state', () {
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final undoable = Undoable<int>(0);
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undoable.state = 1;
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undoable.undo();
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expect(undoable.state, equals(0));
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expect(undoable.previousState, isNull);
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});
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test('when undo is called multiple times expect to return previous state',
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() {
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final undoable = Undoable<int>(0);
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undoable.state = 1;
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undoable.state = 2;
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undoable.undo();
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expect(undoable.state, equals(1));
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expect(undoable.previousState, equals(0));
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undoable.undo();
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expect(undoable.state, equals(0));
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expect(undoable.previousState, isNull);
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});
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}
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