How to generate mock for Stream?

[Albert221]

Code:

@GenerateMocks([], customMocks: [
  MockSpec<Stream<Uri?>>(as: #MockNullableUriStream),
])
class _Nothing {}

Output:

[SEVERE] mockito:mockBuilder on test/mocks.dart:

Invalid @GenerateMocks annotation: Mockito cannot generate a valid mock class which implements 'Stream' for the following reasons:
    The method 'Stream.map' features a non-nullable unknown return type, and cannot be stubbed.
    The method 'Stream.reduce' features a non-nullable unknown return type, and cannot be stubbed.
    The method 'Stream.fold' features a non-nullable unknown return type, and cannot be stubbed.
    The method 'Stream.firstWhere' features a non-nullable unknown return type, and cannot be stubbed.
    The method 'Stream.lastWhere' features a non-nullable unknown return type, and cannot be stubbed.
    The method 'Stream.singleWhere' features a non-nullable unknown return type, and cannot be stubbed.

mockito 5.0.0 - build_runner 1.11.5 - Flutter 2.0.3

[srawlins]

It is not possible yet. #342 is one proposed solution.

[srawlins]

This is now possible (though not very fun) with Mockito 5.0.9. Please see the new section in the NULL_SAFETY_README:

https://github.com/dart-lang/mockito/blob/master/NULL_SAFETY_README.md#fallback-generators