Delphi Code Coverage
This is a command line tool, which can generate a coverage report for unit tested code. The coverage report will show which lines of the code to be tested by unit tests were actually reached by the unit tests run.
This doesn't mean that a covered line is fully tested by unit tests, as this reporting tool cannot check if every condition leading to the running of that line of code has been tested. It forms the basis for a GUI wizard making use of it a bit easier.
This tool is open source and can be found here: https://github.com/DelphiCodeCoverage/DelphiCodeCoverage