DiagnosticableMixin.toString' ('String Function({minLevel: DiagnosticLevel}) isnt a valid override of 'Mock.toString' ('String Function()').

[SenadK95]

'Hello i keep getting the following error while using mockito :

DiagnosticableMixin.toString' ('String Function({minLevel: DiagnosticLevel}) isnt a valid override of 'Mock.toString' ('String Function()').

i already tried :
abstract class MockWithExpandedToString extends Mock {
String toString({ DiagnosticLevel minLevel = DiagnosticLevel.debug });
}
but this didn't work for me.

import 'package:mockito/mockito.dart';
class TestData extends MockWithExpandedToString implements BookingFormState {}

anyone knows how to fix this ?

[srawlins]

You mention that this looks similar to #228, but your two code snippets do not reference each other:

abstract class MockWithExpandedToString extends Mock {
String toString({ DiagnosticLevel minLevel = DiagnosticLevel.debug });
}

and

import 'package:mockito/mockito.dart';
class TestData extends Mock implements BookingFormState {}

Should TestData extend MockWithExpandedToString instead of Mock?

[SenadK95]

Yes you're right, i updated my first comment. I tried it with MockWithExpandedToString but no succes. You have any idea what else it can be @srawlins ?

[srawlins]

We need a complete, reproducing example. I don't see where BookingFormState is. I don't see how DiagnosticLevel is imported.

I don't think "DiagnosticableMixin.toString' ('String Function({minLevel: DiagnosticLevel}) isnt a valid override of 'Mock.toString' ('String Function()')." would show up if TestData extends MockWithExpandedToString instead of Mock. The message doesn't spell "isn't" correctly which is very suspicious.

[SenadK95]

@srawlins The reason why "isn't" was misspelled was because of me. I didn't copy the error but typed it over. For my code i made a repository : https://github.com/SenadK95/vitalforest .

[srawlins]

Thanks for uploading a code repo. It does not reference Mockito though.

[leecommamichael]

This is really easy to reproduce if you attempt to mock a widget that inherits from InheritedWidget.

[natebosch]

Adding the manual override of toString() to fit the signature does work. Here is the minimal example:

This has static errors:

import 'package:mockito/mockito.dart';

class Foo {
  @override
  String toString({String extra}) => extra ?? 'default';
}

class MockFoo extends Mock implements Foo {}

This fixes the errors:

import 'package:mockito/mockito.dart';

class Foo {
  @override
  String toString({String extra}) => extra ?? 'default';
}

class MockFoo extends Mock implements Foo {
  @override
  String toString({String extra}) => super.toString();
}

You can either copy/paste this into your mocks:

  @override
  String toString({ DiagnosticLevel minLevel = DiagnosticLevel.debug }) => super.toString();

Or you can define it once:

abstract class MockWithDiagnosticToString extends Mock {
  @override
  String toString({ DiagnosticLevel minLevel = DiagnosticLevel.debug }) => super.toString();
}

Then replace extends Mock with extends MockWithDiagnosticToString any place that needs it. Note that in the first 2 comments the definition of toString was abstract - it did not provide a body. Replace the ; with => super.toString(); to fix this.

Closing since this can be worked around locally and there are no actions to take in this package.