| Element | Missed Instructions | Cov. | Missed Branches | Cov. | Missed | Cxty | Missed | Lines | Missed | Methods |
| Total | 66 of 224 | 71% | 10 of 26 | 62% | 8 | 20 | 11 | 43 | 1 | 7 |
| read() | | 20% | | 25% | 2 | 3 | 5 | 7 | 0 | 1 |
| close() | | 0% | | 0% | 3 | 3 | 5 | 5 | 1 | 1 |
| IOInputStream(IRubyObject) | | 71% | | 62% | 3 | 5 | 1 | 8 | 0 | 1 |
| read(byte[]) | | 100% | | 100% | 0 | 3 | 0 | 9 | 0 | 1 |
| read(byte[], int, int) | | 100% | | 100% | 0 | 3 | 0 | 9 | 0 | 1 |
| available() | | 100% | | 100% | 0 | 2 | 0 | 3 | 0 | 1 |
| static {...} | | 100% | n/a | 0 | 1 | 0 | 2 | 0 | 1 |