output of (single AST) refactorings has the form ([(ast, ast-t)], fatal-errors, errors, warnings) whereby fatal-errors, errors, warnings are lists.
The (number of) fatal-errors, errors, warnings should be testable. For example:

test Rename refactoring

bbb = id
refactor rename(“foo”) to
foo = id

1 errors
2 warnings

Submitted by Maartje on 26 July 2011 at 09:30

implemented.