Define the required edge set
Synthetic journey requires edges sign-in→list, list→detail and detail→confirm. Probe P1 tests the first two; P2 repeats list→detail. Passing any tested edge says nothing about detail→confirm. Measure coverage by distinct required edges.
| Probe | Edges observed | Unique new edges |
|---|---|---|
| P1 | Sign-in→list; list→detail | 2 |
| P2 | List→detail | 0 |
| Required | Three edges | Missing detail→confirm |
Compare probe paths
- List required edges once
- Union observed edges
- Subtract observed from required
A probe name without its executed edges cannot establish coverage.
What fraction of required edges is observed?
Show the worked answer
Two of three, about 66.67%. There are three probe-edge executions but only two distinct required edges.
Name the unobserved edge
| Case | Decision | Reason |
|---|---|---|
| Count executions 3 | Not full coverage | One edge repeated |
| Add detail→confirm probe | Can cover 3/3 if executed | Previously missing edge |
Retain the executed path and result for the last edge. A newly written probe configuration alone has not produced that evidence.