| Element | Missed Instructions | Cov. | Missed Branches | Cov. | Missed | Cxty | Missed | Lines | Missed | Methods |
| Total | 40 of 136 | 71% | 7 of 14 | 50% | 7 | 11 | 10 | 37 | 1 | 4 |
| convert_byte(ByteList, String, RubyNKF.NKFCharset) | | 80% | | 50% | 3 | 4 | 4 | 22 | 0 | 1 |
| encodeMimeString(Ruby, RubyString, ByteList) | | 0% | n/a | 1 | 1 | 2 | 2 | 1 | 1 | |
| isMimeText(ByteList, Map) | | 63% | | 50% | 3 | 5 | 4 | 9 | 0 | 1 |
| RubyNKF.Converter(ThreadContext, Map) | | 100% | n/a | 0 | 1 | 0 | 4 | 0 | 1 |