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Lesson 19: Stubbing synchronous methods with mockito #19

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Dec 2, 2020
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Lesson 19: Stubbing synchronous methods with mockito #19

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2 changes: 2 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,8 @@ Calculator - [Caster.IO](https://caster.io) project to showcase testing techniqu

[Lesson 18: Controlling the behavior of your dependencies using mockito](https://caster.io/lessons/lesson-18-controlling-the-behavior-of-your-dependencies-using-mockito) 👉🏾 [Branch](https://github.com/samuelematias/calculator_app/tree/lesson18)

[Lesson 19: Stubbing synchronous methods with mock](https://caster.io/lessons/lesson-19-stubbing-synchronous-methods-with-mockito) 👉🏾 [Branch](https://github.com/samuelematias/calculator_app/tree/lesson19)

## License

```
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34 changes: 31 additions & 3 deletions test/two_digit_operation_test.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -16,8 +16,9 @@ void main() {

group('TwoDigitOperation', () {
group('Operation.add', () {
testWidgets('paints 4.0 when adding 3 and 1', (tester) async {
when(calculator.add(3, 1)).thenReturn(4);
testWidgets('paints the value returned by the calculator',
(tester) async {
when(calculator.add(3, 1)).thenReturn(25);
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
Expand All @@ -37,7 +38,34 @@ void main() {
'1',
);
await tester.pumpAndSettle();
expect(find.text('is 4.0'), findsOneWidget);
expect(find.text('is 25.0'), findsOneWidget);
});
});

group('Operation.divide', () {
testWidgets('paints the value returned by the calculator',
(tester) async {
when(calculator.divide(3, 0)).thenThrow(Exception('oops'));
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: TwoDigitOperation(
operation: Operations.divide,
calculator: calculator,
),
),
),
);
await tester.enterText(
find.byKey(const Key('textField_top_divided by')),
'3',
);
await tester.enterText(
find.byKey(const Key('textField_bottom_divided by')),
'0',
);
await tester.pumpAndSettle();
expect(find.text('is ???'), findsOneWidget);
});
});
});
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