Cannot mock (mockito) functions which return Either

[Adam-Langley]

In 1.0.0 the Either class was sealed. This breaked the generated mocking code for unit tests.

Is there a need for this class to be sealed?

We are forced to remain on version 0.4.0 - please reconsider sealing.

Thank you

[avdosev]

I think you have encountered the same issue as other Mockito users - dart-lang/mockito#675

Is there a need for this class to be sealed?

Yes, it is necessary for the Exhaustiveness checking introduced in dart 3 to work.

We are forced to remain on version 0.4.0

This is not bad, I recommend you to stay on this version and specify in this issue why it's important for you as a Mockito user to have sealed class support.

Also, I am not closing this discussion to find out new solutions to this problem. But at the moment the abandonment of sealed looks contradictory requiring a switch to a new major version of the package.