Mock generator maps incorrectly for method returning Iterable with type parameter

[Shashindran]

Steps to Reproduce
Generate a mock for class with a getter which returns an Iterable.

For my scenario, I mocked hive box class which its values method return an Iterable.

The generated mock method as below

@override
Iterable<E> get values => (super.noSuchMethod(Invocation.getter(#values), returnValue: []) as Iterable<E>);

Sample test code

@GenerateMocks([HiveInterface, Box])
void main() async {

// other codes here

 final userList = [User()];

 test(
   'should return user if the get request succeed',
   () async {
     //arrange
     when(hive.box(any)).thenReturn(box);
     when(box.values).thenReturn(userList);

     //act
     final result = await repository.getAll();

     //asset
     verify(box.values).called(1);
     verifyNoMoreInteractions(box);
     expect(result, userList);
   },
 );

Outcome
Running test with the mocked method gives the following error
type 'List<dynamic>' is not a subtype of type 'Iterable<User>' in type cast MockBox.values

Expected
Test should pass

Possible solution
Able to make the error go away by changing the returnValue: [] to returnValue: <E>[] or returnValue: Iterable<E>.empty()

@override
Iterable<E> get values => (super.noSuchMethod(Invocation.getter(#values), returnValue: <E>[]) as Iterable<E>);

or

@override
Iterable<E> get values => (super.noSuchMethod(Invocation.getter(#values), returnValue: Iterable<E>.empty()) as Iterable<E>);

Version

• Platform: macOs Big Sur, 11.4
• Flutter version: Channel stable, 2.2.2
• Mockito version: 5.0.10

[srawlins]

Thanks for the bug report. I've got a fix in the works.