_getResultsViewRecordFields does not need fields argument anymore.
It now returns its own filter dictionary when called. Should be overwritten by subclasses who wish to use other filters.
Coverage: code coverage testing for Python
Coverage.py is a Python module that measures code coverage during test execution.
It uses the code analysis tools and tracing hooks provided in the Python standard
library to determine which lines are executable, and which have been executed.
For more information, see http://nedbatchelder.com/code/modules/coverage.html