| Name | Lines of code | Maintainability | Test coverage |
| src/Expectation.php | 249 | B 4 hrs | A 97% |
| src/Block/Group.php | 250 | C 7 hrs | A 93% |
| src/Reporter/Coverage.php | 257 | C 1 day | |
| src/Reporter/Coverage/Collector.php | 287 | C 1 day | |
| src/Plugin/Double.php | 295 | C 1 day | A 99% |
| src/Reporter/Terminal.php | 371 | D 2 days | |
| src/Jit/ClassLoader.php | 498 | F 3 days | A 93% |
| src/Cli/Kahlan.php | 616 | F 4 days | |
| src/Jit/Parser.php | 652 | F 4 days | A 96% |