calculus-use-case-test.dart

void main() {
  group('Calculator use case', () {
    group('calculates value of', () {
      Map<CalculatorUseCase, num> testCases = {
        CalculatorUseCase(operation: Operation.addition, operandA: 1, operandB: 2): 3,
        ...
      };
      testCases.forEach((useCase, expected) {
        test('${useCase.operation}', () {
          expect(useCase.value, expected);
        });
      });
    });

    group('formats', () {
      Map<CalculatorUseCase, String> testCases = {
        CalculatorUseCase(operation: Operation.addition, operandA: 1, operandB: 2): '1 + 2',
        ...
      };
      testCases.forEach((useCase, expected) {
        test('${useCase.operation}', () {
          expect(useCase.format, expected);
        });
      });
    });

    test('sets operation', () {
      CalculatorUseCase useCase = CalculatorUseCase(operation: Operation.addition, operandA: 1, operandB: 2);

      expect(useCase.operation, Operation.addition);
      useCase.setOperation(Operation.subtraction);
      expect(useCase.operation, Operation.subtraction);
    });

    test('sets operands', () {...});
    test('sets operands from memory', () {...});
    test('manages memory', () {...});
  });
}