I've modified the `Scale.configure` implementation as follows:

```
   def configure(self, cnf=None, **kw):
        """Modify or query scale options.

        Setting a value for any of the "from", "from_" or "to" options
        generates a <<RangeChanged>> event."""
        if cnf:
            kw.update(cnf)
        retval = Widget.configure(self, **kw)
        if any(['from' in kw, 'from_' in kw, 'to' in kw]):
            self.event_generate('<<RangeChanged>>')
        return retval
```

It works as expected for my project, but I don't have regression tests or exahustive code checking in place to verify it behaves correctly for all use cases. How can we manage to perform those tests?