Merge pull request #9 from samuelematias/lesson9

Lesson 9

.github/PULL_REQUEST_TEMPLATE.md

@@ -10,4 +10,4 @@ A few sentences describing the PR.
 
 ## Preview
 
-If there if, show the preview with screenshot.
+If there if, show the preview with screenshot.

README.md

@@ -20,6 +20,8 @@ Calculator - [Caster.IO](https://caster.io) project to showcase testing techniqu
 
 [Lesson 8: Testing code that throws an Error or an Exception](https://caster.io/lessons/lesson-8-testing-code-that-throws-an-error-or-an-exception) 👉🏾 [Branch](https://github.com/samuelematias/calculator_app/tree/lesson8)
 
+[Lesson 9: Sharing code between tests with setUp() and tearDown()](https://caster.io/lessons/lesson-9-sharing-code-between-tests-with-setup-and-teardown) 👉🏾 [Branch](https://github.com/samuelematias/calculator_app/tree/lesson9)
+
 ## License
 
 ```

packages/calculator/test/calculator_test.dart

@@ -2,55 +2,52 @@ import 'package:calculator/calculator.dart';
 import 'package:flutter_test/flutter_test.dart';
 
 void main() {
+  Calculator calculator;
+
+  setUp(() {
+    calculator = Calculator();
+  });
+
   group('add', () {
     test('the calculator returns 4 when adding 2 and 2', () {
-      final calculator = Calculator();
       expect(calculator.add(2, 2), 4);
     });
 
     test('the calculator returns 40 when adding 20 and 20', () {
-      final calculator = Calculator();
       expect(calculator.add(20, 20), 40);
     });
   });
 
   group('substract', () {
     test('the calculator returns 10 when substracting 10 to 20', () {
-      final calculator = Calculator();
       expect(calculator.substract(20, 10), 10);
     });
 
     test('the calculator returns -4 when substracting 8 to 4', () {
-      final calculator = Calculator();
       expect(calculator.substract(4, 8), -4);
     });
   });
 
   group('multiple', () {
     test('the calculator returns 45 when multiplying 5 tby 9', () {
-      final calculator = Calculator();
       expect(calculator.multiply(5, 9), 45);
     });
 
     test('the calculator returns 18 when multiplying 25 tby 9', () {
-      final calculator = Calculator();
       expect(calculator.multiply(2, 9), 18);
     });
   });
 
   group('divide', () {
     test('the calculator returns 9 when dividing 27 by 3', () {
-      final calculator = Calculator();
       expect(calculator.divide(27, 3), 9);
     });
 
     test('the calculator returns 1 when dividing 27 by 27', () {
-      final calculator = Calculator();
       expect(calculator.divide(27, 27), 1);
     });
 
     test('the calculator throws an ArgumentError when dividing by zero', () {
-      final calculator = Calculator();
       expect(() => calculator.divide(27, 0), throwsArgumentError);
     });
   });