Show coverage of executed code, like http://nedbatchelder.com/code/coverage/

http://en.wikipedia.org/wiki/Code_coverage

Function coverage - Has each function in the program been called? Statement coverage - Has each line of the source code been executed? Decision coverage (also known as Branch coverage) - Has each control structure (such as an IF statement) evaluated both to true and false? Condition coverage (or Predicate coverage) - Has each boolean sub-expression evaluated both to true and false (this does not necessarily imply decision coverage)? Modified Condition/Decision Coverage (MC/DC) - Has every condition in a decision taken on all possible outcomes at least once? Has each condition been shown to affect that decision outcome independently? Path coverage - Has every possible route through a given part of the code been executed? Entry/exit coverage - Has every possible call and return of the function been executed?