code: def _set_def_prompt(self):
          
          if len(self.active) > 15:
              ids = self.active.split(".")
              if len(ids) > 2:
                  module, executable, compiler = ids
              else:
                  module, executable = ids
                  compiler = "g"
              self.prompt = "({}*.{}*.{}:{})".format(module[0:6], executable[0:6], compiler, self.group)
          else:
              self.prompt = "({}:{})".format(self.active, self.group)
docs: Sets the default prompt to match the currently active unit test.