[Flutter] Error generating Mocks with @GenerateNiceMocks annotation flutter dart

I am trying to Mock a class with @GenerateNiceMocks, when I setup @GenerateNiceMocks and tried to build the generated files I encountered following problem.

Invalid @GenerateMocks annotation: Mockito cannot generate a valid mock
class which implements 'CLASS TO MOCK' for the following reasons:

The property accessor 'CLASS.VARIABLE=' features a private parameter type, '_ANOTHERCLASS', and cannot be stubbed.
Try generating this mock with a MockSpec with 'unsupportedMembers' or a dummy generator (see
https://pub.dev/documentation/mockito/latest/annotations/MockSpec-class.html).


Following is replica of my code:

class CLASSTOMOCK {
late final _ANOTHERCLASS classVariable;

CLASSTOMOCK(){
classVariable = _ANOTHERCLASS();
}
}


I have tried with all the options of Mocking like @GenerateMocks, @GenerateNiceMocks and creating a new class by extending Mock and implementing CLASSTOMOCK. But no luck.

I am also using unsupportedMembers option in @GenerateNiceMocks but it's not working properly.

Thank you in advance for helping me.

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