Created
May 30, 2023 22:39
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Test doubles em Dart: dummies, fakes, stubs e spies.
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| enum PizzaAPIError { offline, unauthorized } | |
| class Pizza { | |
| final String name; | |
| Pizza(this.name); | |
| } | |
| class Result<T, E> { | |
| final T? success; | |
| final E? failure; | |
| Result.success(this.success) : failure = null; | |
| Result.failure(this.failure) : success = null; | |
| } | |
| abstract class PizzaGetter { | |
| void getPizza(void Function(Result<List<Pizza>, PizzaAPIError>) completion); | |
| } | |
| class PizzaGetterStub implements PizzaGetter { | |
| final Result<List<Pizza>, PizzaAPIError> result; | |
| PizzaGetterStub.success(List<Pizza> pizzas) : result = Result.success(pizzas); | |
| PizzaGetterStub.failure(PizzaAPIError error) : result = Result.failure(error); | |
| @override | |
| void getPizza(void Function(Result<List<Pizza>, PizzaAPIError>) completion) { | |
| completion(result); | |
| } | |
| } | |
| class PizzaGetterFake implements PizzaGetter { | |
| @override | |
| void getPizza(void Function(Result<List<Pizza>, PizzaAPIError>) completion) { | |
| final pizzas = [ | |
| Pizza('Margherita'), | |
| Pizza('Pepperoni'), | |
| Pizza('Mushroom'), | |
| ]; | |
| completion(Result.success(pizzas)); | |
| } | |
| } | |
| class PizzaGetterDummy implements PizzaGetter { | |
| @override | |
| void getPizza(void Function(Result<List<Pizza>, PizzaAPIError>) completion) { | |
| // Não faz nada, é um dummy | |
| } | |
| } | |
| void main() { | |
| final stubSuccess = PizzaGetterStub.success([ | |
| Pizza('Margherita'), | |
| Pizza('Pepperoni'), | |
| ]); | |
| stubSuccess.getPizza((result) { | |
| if (result.success != null) { | |
| print('Pizzas obtidas com sucesso:'); | |
| result.success?.forEach((pizza) { | |
| print(pizza.name); | |
| }); | |
| } else if (result.failure != null) { | |
| print('Erro ao obter pizzas: ${result.failure}'); | |
| } | |
| }); | |
| final stubFailure = PizzaGetterStub.failure(PizzaAPIError.offline); | |
| stubFailure.getPizza((result) { | |
| if (result.success != null) { | |
| print('Pizzas obtidas com sucesso:'); | |
| result.success?.forEach((pizza) { | |
| print(pizza.name); | |
| }); | |
| } else if (result.failure != null) { | |
| print('Erro ao obter pizzas: ${result.failure}'); | |
| } | |
| }); | |
| final fake = PizzaGetterFake(); | |
| fake.getPizza((result) { | |
| if (result.success != null) { | |
| print('Pizzas obtidas com sucesso:'); | |
| result.success?.forEach((pizza) { | |
| print(pizza.name); | |
| }); | |
| } else if (result.failure != null) { | |
| print('Erro ao obter pizzas: ${result.failure}'); | |
| } | |
| }); | |
| final dummy = PizzaGetterDummy(); | |
| dummy.getPizza((result) { | |
| if (result.success != null) { | |
| print('Pizzas obtidas com sucesso:'); | |
| result.success?.forEach((pizza) { | |
| print(pizza.name); | |
| }); | |
| } else if (result.failure != null) { | |
| print('Erro ao obter pizzas: ${result.failure}'); | |
| } | |
| }); | |
| } |
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