tests: Fix test to work on Windows

On Windows the absolute_path() call made the path look like
c:\\foobar instead of /foobar which made the repr() test fail.
tests: Fix polling test moves to work in Windows

Like explained in the observers.polling code, on Windows we do not get moves with the polling observer, change tests to take that into account.
Merge pull request #153 from Ormod/win_test_fixes

Win test fixes