mengw15 opened a new issue, #6361:
URL: https://github.com/apache/texera/issues/6361
### Task Summary
`frontend/src/app/common/formly/formly-utils.ts` (codecov ~16%) has pure
helpers over `FormlyFieldConfig` arrays: `getFieldByName`, `setHideExpression`,
and the `createShouldHideFieldFunc` predicate factory. Cover them with Vitest
on plain objects (no `TestBed`). The rxjs `createOutputFormChangeEventStream`
(debounce/distinct/share stream) is out of scope for this issue. See
`frontend/TESTING.md`.
### Behavior to cover
- `getFieldByName(name, fields)` — returns the field whose `key === name`;
`undefined` when no field matches; the first match when several share a key
- `createShouldHideFieldFunc(...)` — the returned predicate:
- `model` is `null`/`undefined` -> returns `false`
- target field value is `null`/`undefined` -> returns `hideOnNull`
- regex mode -> hides iff the value matches `^(expected)$`
- non-regex mode -> hides iff `value.toString() === expected`
- `setHideExpression(toggleHidden, fields, hiddenBy)` — sets `hideExpression
= hiddenBy` on each named field that exists; no-op for names not present
### Task Type
- [ ] Refactor / Cleanup
- [ ] DevOps / Deployment / CI
- [x] Testing / QA
- [ ] Documentation
- [ ] Performance
- [ ] Other
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