Created
September 22, 2023 13:20
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2023鐵人賽_D8_2
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import 'package:shared_preferences/shared_preferences.dart'; | |
import 'product.dart'; | |
class MyFavorites { | |
final SharedPreferences _preferences; | |
MyFavorites(SharedPreferences preference) : _preferences = preference; | |
Future<void> add(Product product) async { | |
var favorites = getAll(); | |
favorites.add(product); | |
await _preferences.setStringList("favorites", | |
favorites.map((product) => product.id.toString()).toList()); | |
} | |
List<Product> getAll() { | |
return _preferences | |
.getStringList("favorites") | |
?.map((id) => Product(int.parse(id))) | |
.toList() ?? | |
[]; | |
} | |
} |
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import 'package:flutter_test/flutter_test.dart'; | |
import 'package:shared_preferences/shared_preferences.dart'; | |
import 'product.dart'; | |
import 'my_favorites.dart'; | |
main() { | |
test("add favorite", () { | |
var fakeSharedPreferences = FakeSharedPreferences(); | |
var myFavorites = MyFavorites(fakeSharedPreferences); | |
myFavorites.add(const Product(1)); | |
expect(myFavorites.getAll(), [const Product(1)]); | |
}); | |
} | |
class FakeSharedPreferences implements SharedPreferences { | |
List<String> fake = []; | |
@override | |
Future<bool> setStringList(String key, List<String> value) async { | |
fake = value; | |
return true; | |
} | |
@override | |
List<String>? getStringList(String key) { | |
return fake; | |
} | |
@override | |
dynamic noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation); | |
} |
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import 'package:equatable/equatable.dart'; | |
class Product extends Equatable { | |
final int id; | |
const Product(this.id); | |
@override | |
List<Object?> get props => [id]; | |
} |
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