GenerateMocks not properly generating mocks that use the Diagnosticable mixin

[arthurpiccoli]

After generating the following mock class:
class _FakeTextStyle extends _i1.Fake implements _i12.TextStyle {}

This error occurred:
'Object.toString' ('String Function()') isn't a valid concrete implementation of 'Diagnosticable.toString' ('String Function({DiagnosticLevel minLevel})')

It happened due to the toString method on Diagnosticable dependent classes, as TextStyle being one, having a different format, needing a DiagnosticLevel as param. This simple solution did the trick, but it was necessary to edit the generated file:

class _FakeTextStyle extends _i1.Fake implements _i12.TextStyle {
  @override
  String toString({DiagnosticLevel minLevel = DiagnosticLevel.info}) {
    return super.toString();
  }
}

[srawlins]

Thanks for opening an issue. This has been discussed at #233. See the solution.

[safarmer]

@srawlins the solution in #233 only seems to cover manually created mocks? How would we apply this to @GeneratedMocks?

[srawlins]

Oops, apologies. You are correct; that solution works for manual mocks. This issue is actually a duplicate of #371.