| Element | Missed Instructions | Cov. | Missed Branches | Cov. | Missed | Cxty | Missed | Lines | Missed | Methods |
| Total | 21 of 28 | 25% | 4 of 4 | 0% | 5 | 6 | 3 | 5 | 3 | 4 |
| equals(Object) | | 0% | | 0% | 3 | 3 | 1 | 1 | 1 | 1 |
| getErrorClass(Ruby) | | 0% | n/a | 1 | 1 | 1 | 1 | 1 | 1 | |
| hashCode() | | 0% | n/a | 1 | 1 | 1 | 1 | 1 | 1 | |
| NullMemoryIO(Ruby) | | 100% | n/a | 0 | 1 | 0 | 2 | 0 | 1 |