#3 little informative failure reports

[Mario Frasca]

the reports I get on the command line are less informative than I would like:
I'm running unit tests in an emacs buffer, failures are reported as:
FAILURE in <test-function>: Error in checkIdentical(target, current) : FALSE

I would find it a lot more helpful if the report would give:
- the source file containing the test function.
- the line in the file where the failure occurs.
- the values of the two non matching objects.