[TEST] RadioGroup: roving focus, form value, data-attrs

[kotAPI]

Labels: tests, a11y, component:RadioGroup, priority:medium

Summary
Ensure RadioGroup supports roving focus, controlled/uncontrolled selection, form submission, and data-state attributes.

Acceptance Criteria

Arrow keys move focus and selection; Home/End jump to first/last.

Controlled value prop syncs with onValueChange; defaultValue works.

form submit includes selected value; disabled radios skip focus.

data-state="checked|unchecked"; data-disabled set when disabled.

AXE: no violations; role="radiogroup"/"radio".

asChild radios preserve semantics/refs.

Test Plan (Implementation Notes)
Framework: Jest + React Testing Library
Files: src/components/ui/RadioGroup/tests/RadioGroup.behavior.test.tsx
Helpers: user-event
Edge cases: no default selection, nested groups, RTL
Coverage Targets: ≥80% branch.

Out of Scope
Visual layouts.

Risk
medium – roving focus.

Effort
M

References

src/components/ui/RadioGroup/RadioGroup.tsx

src/components/ui/RadioGroup/tests/RadioGroup.test.tsx

WAI-ARIA radiogroup pattern