anchor.diff:          return tuneup.run(['check'], directory: foo);
         }).then((_) {
           expect(
  -            logger.out, contains('No issues found; analyzed 1 source file in'));
  +            logger.out, contains('No issues found; analyzed 2 source files in'));
           expect(logger.err, isEmpty);
         });
       });
  
positive.code:         return tuneup.run(['check'], directory: foo);
        }).then((_) {
          expect(
              logger.out, contains('No issues found; analyzed 1 source file in'));
          expect(logger.err, isEmpty);
        });
      });
  
negative.code:       }).catchError((e) {
          expect(e is ExitCode, true);
          expect(
              logger.out, contains('2 issues found; analyzed 2 source files in'));
          expect(logger.err, isEmpty);
        });
      });
  