Lesson 13: The difference between pumpWidget(), pump() and pumpAndSettle()

[samuelematias]

Description

PR with Lesson 13.

pumpWidget
pump
pumpAndSettle

pumpWidget is like a runApp method, to run our app, but in the test context.

...
await tester.pumpWidget(CalculatorApp());
..

pump if has some change in your widget by some action (e.g. set a value inside a TextField and show this value bellow the TextField), this represents a new frame, so pump help in this case.

...
await tester.pumpWidget(CalculatorApp());
await tester.enterText(find.byKey(Key('textField_top_plus')), '3');
await tester.enterText(find.byKey(Key('textField_bottom_plus')), '6');
await tester.pump();
...

pumpAndSettle if has some change in your widget by some action (e.g. set a value inside a TextField and show this value bellow the TextField), but with some animation, this represents a new frame and sometimes take a while for this animation show/end, so pumpAndSettle help in this case.

...
await tester.pumpWidget(CalculatorApp());
await tester.enterText(find.byKey(Key('textField_top_plus')), '3');
await tester.enterText(find.byKey(Key('textField_bottom_plus')), '6');
await tester.pumpAndSettle();
...

Types of changes

• Fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Improvement (non-breaking change which adds Improvements)