79 lines
2.2 KiB
Dart
79 lines
2.2 KiB
Dart
 
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import 'package:flutter_test/flutter_test.dart';
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import 'package:badnote/models/ink_point.dart';
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import 'package:badnote/models/ink_stroke.dart';
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import 'package:badnote/models/pen_tool.dart';
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import 'package:badnote/services/undo_manager.dart';
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InkStroke _stroke(String id) => InkStroke(
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id: id,
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points: const [
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InkPoint(x: 0, y: 0, pressure: 0.5, tilt: 0, timestamp: 0),
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InkPoint(x: 1, y: 1, pressure: 0.5, tilt: 0, timestamp: 1),
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],
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tool: PenTool.pen,
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createdAt: DateTime(2024, 1, 1),
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);
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void main() {
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group('UndoManager', () {
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test('starts empty with no undo/redo available', () {
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final m = UndoManager();
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expect(m.currentStrokes, isEmpty);
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expect(m.canUndo, isFalse);
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expect(m.canRedo, isFalse);
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});
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test('addStroke then undo/redo round-trips the stroke', () {
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final m = UndoManager();
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final s = _stroke('a');
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m.addStroke(s);
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expect(m.currentStrokes.map((e) => e.id), ['a']);
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expect(m.canUndo, isTrue);
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m.undo();
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expect(m.currentStrokes, isEmpty);
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expect(m.canRedo, isTrue);
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m.redo();
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expect(m.currentStrokes.map((e) => e.id), ['a']);
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});
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test('a new stroke clears the redo stack', () {
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final m = UndoManager();
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m.addStroke(_stroke('a'));
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m.undo();
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expect(m.canRedo, isTrue);
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m.addStroke(_stroke('b'));
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expect(m.canRedo, isFalse);
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expect(m.currentStrokes.map((e) => e.id), ['b']);
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});
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test('removeStroke with replacements (partial erase) is reversible', () {
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final m = UndoManager();
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m.addStroke(_stroke('whole'));
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m.removeStroke(
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_stroke('whole'),
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replacements: [_stroke('part1'), _stroke('part2')],
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);
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expect(m.currentStrokes.map((e) => e.id), ['part1', 'part2']);
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// Undo restores the original and drops the replacements.
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m.undo();
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expect(m.currentStrokes.map((e) => e.id), ['whole']);
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// Redo re-applies the erase.
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m.redo();
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expect(m.currentStrokes.map((e) => e.id), ['part1', 'part2']);
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});
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test('currentStrokes is an unmodifiable view', () {
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final m = UndoManager();
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m.addStroke(_stroke('a'));
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expect(() => m.currentStrokes.add(_stroke('b')), throwsUnsupportedError);
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});
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});
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}
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