| Element | Missed Instructions | Cov. | Missed Branches | Cov. | Missed | Cxty | Missed | Lines | Missed | Methods |
| Total | 52 of 218 | 76% | 8 of 20 | 60% | 10 | 20 | 8 | 54 | 2 | 10 |
| add(IRubyObject, Block) | | 55% | | 50% | 7 | 8 | 4 | 15 | 0 | 1 |
| addDirectly(RubyThread) | | 86% | | 100% | 0 | 2 | 0 | 9 | 0 | 1 |
| list(Block) | | 86% | | 75% | 1 | 3 | 1 | 8 | 0 | 1 |
| remove(RubyThread) | | 76% | n/a | 0 | 1 | 0 | 5 | 0 | 1 | |
| enclose(Block) | | 0% | n/a | 1 | 1 | 2 | 2 | 1 | 1 | |
| size() | | 0% | n/a | 1 | 1 | 1 | 1 | 1 | 1 | |
| createThreadGroupClass(Ruby) | | 100% | n/a | 0 | 1 | 0 | 8 | 0 | 1 | |
| RubyThreadGroup(Ruby, RubyClass) | | 100% | n/a | 0 | 1 | 0 | 4 | 0 | 1 | |
| enclosed_p(Block) | | 100% | n/a | 0 | 1 | 0 | 1 | 0 | 1 | |
| static {...} | | 100% | n/a | 0 | 1 | 0 | 1 | 0 | 1 |