| Element | Missed Instructions | Cov. | Missed Branches | Cov. | Missed | Cxty | Missed | Lines | Missed | Methods |
| Total | 127 of 165 | 23% | 51 of 54 | 6% | 28 | 29 | 1 | 5 | 1 | 2 |
| differenceOperationToCeylon(Tree.DifferenceOp) | | 23% | | 6% | 27 | 28 | 0 | 4 | 0 | 1 |
| differenceOperationToCeylon_() | | 0% | n/a | 1 | 1 | 1 | 1 | 1 | 1 |