1. A computer program product for integrating a code coverage tool with a debugger, the computer program product comprising: a non-transitory storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising: performing a session of operation of a debugger tool on a set of source code for an application program, the debugger tool having a debugger user interface; executing a set of instructions associated with the set of source code; generating a set of code coverage information by a code coverage collection process operating on the set of source code during a debugging process; contemporaneous with the session of operation of the debugger tool, operating a code coverage tool; monitoring and recording, with the code coverage tool, at least one instruction in the set of instructions associated with the set of source code, where the at least one instruction was executed during the session of operation of the debugger tool on the set of source code; identifying at least one source code line in the set of source code corresponding to the at least one instruction in the set of instructions that has been executed during the session of operation of the debugger tool on the set of source code; and visually displaying, in the debugger user interface, the identified at least one source code line.