| Element | Missed Instructions | Cov. | Missed Branches | Cov. | Missed | Cxty | Missed | Lines | Missed | Methods |
| Total | 424 of 846 | 49% | 57 of 100 | 43% | 43 | 62 | 94 | 187 | 7 | 12 |
| write(String, int, int) | | 0% | | 0% | 16 | 16 | 55 | 55 | 1 | 1 |
| write(int) | | 52% | | 55% | 7 | 10 | 13 | 28 | 0 | 1 |
| illegalSurrogateDesc(int) | | 0% | | 0% | 4 | 4 | 7 | 7 | 1 | 1 |
| flush() | | 0% | | 0% | 3 | 3 | 6 | 6 | 1 | 1 |
| write(char[], int, int) | | 95% | | 90% | 3 | 16 | 4 | 55 | 0 | 1 |
| convertSurrogate(int) | | 68% | | 50% | 2 | 3 | 1 | 5 | 0 | 1 |
| write(char[]) | | 0% | n/a | 1 | 1 | 2 | 2 | 1 | 1 | |
| write(String) | | 0% | n/a | 1 | 1 | 2 | 2 | 1 | 1 | |
| illegalSurrogate(int) | | 0% | n/a | 1 | 1 | 1 | 1 | 1 | 1 | |
| append(char) | | 0% | n/a | 1 | 1 | 2 | 2 | 1 | 1 | |
| close() | | 96% | | 50% | 4 | 5 | 1 | 17 | 0 | 1 |
| UTF8Writer(IOContext, OutputStream) | | 100% | n/a | 0 | 1 | 0 | 7 | 0 | 1 |