tree 4b9e6006c34c987595081c67502462ce1a8ab874
parent fcb9779f8e8a15b2ca1757611b3e32a84e24c7ed
author Ilya Yanok <yanok@google.com> 1700062418 -0800
committer Copybara-Service <copybara-worker@google.com> 1700062444 -0800

Generate valid functions with optional non-nullable arguments

If a method of a mocked class returns a function with optional
yet non-nullable argument, Mockito currently produces something
like
```dart
(int x, {int y}) => /* doesn't matter */
```
which is not a valid Dart, since `y` must either be `required` or
have a default value. `required` won't fit into the desired type
and coming up with a default value is not easy, since it has to
be a constant, but `dummyValue` doesn't always produce one.

Fortunately, we can just widen the type here and make it nullable.

PiperOrigin-RevId: 582669927