Google Flutter Google Flutter Testing 2

Question 1

Which package is the standard choice for mocking dependencies in Flutter unit and widget tests?

Accepted Answer

mockito

Answer

mockito is the widely used Dart mocking library that generates mock classes via code generation with @GenerateMocks.

Question 2

What does the expect() function do in a Flutter test?

Accepted Answer

It asserts that the actual value matches the matcher

Answer

expect() compares an actual value against a matcher (like equals(), isTrue, findsOneWidget) and fails the test if they don't match.

Question 3

Which matcher verifies that exactly one matching widget exists in the widget tree?

Accepted Answer

findsOneWidget

Answer

findsOneWidget asserts that exactly one widget matching the finder exists in the widget tree.

Question 4

What is the purpose of setUp() in Flutter tests?

Accepted Answer

It runs code before each test case to initialize shared state

Answer

setUp() runs its callback before every individual test case, making it suitable for initializing mocks or resetting state.

Question 5

How do you simulate a user tapping a widget in a Flutter widget test?

Accepted Answer

tester.tap()

Answer

WidgetTester.tap() simulates a touch at the center of the widget found by a Finder.

Google Flutter Practice Test