Testing a tap that triggers a SnackBar
WHAT IT TESTS: widget-test interaction flow. OUTLINE: pumpWidget the app, find the button, tester.tap it, call pump or pumpAndSettle to advance frames, then expect a SnackBar finder. RED FLAG: forgetting to pump after the tap so the SnackBar never appears.
WHAT IT TESTS: whether you can drive and assert on UI in widget tests. ANSWER OUTLINE: build the widget under a MaterialApp with pumpWidget, locate the button with find.byType or find.text, simulate the gesture with await tester.tap(finder), then advance the frame pipeline with await tester.pump or pumpAndSettle so the SnackBar animates in, and finally assert with expect(find.text('message'), findsOneWidget). RED FLAG: omitting the pump after tap, so the rebuild and animation never run and the assertion fails despite correct app code.
Read the original → interview
- #flutter
- #testing
- #widgettester
- #snackbar
- #widget-test
Get five bites like this every day.
Tezvyn delivers a daily feed of 60-second tech bites with quizzes to lock in what you learn.