Chain multiple calls with same arguments to return different results
Use a list and return the answers with removeAt:
import 'package:test/test.dart';import 'package:mockito/mockito.dart';void main() { test("some string test", () { StringProvider strProvider = MockStringProvider(); var answers = ["hello", "world"]; when(strProvider.randomStr()).thenAnswer((_) => answers.removeAt(0)); expect(strProvider.randomStr(), "hello"); expect(strProvider.randomStr(), "world"); });}class StringProvider { String randomStr() => "real implementation";}class MockStringProvider extends Mock implements StringProvider {}
You're not forced to call when in the start of the test:
StringProvider strProvider = MockStringProvider();when(strProvider.randomStr()).thenReturn("hello");expect(strProvider.randomStr(), "hello");when(strProvider.randomStr()).thenReturn("world");expect(strProvider.randomStr(), "world");Mockito is dart has a different behavior. Subsequent calls override the value.