test(escrow): unit tests for high-value cargo multi-sig modal

[Deb-Auth]

Closes #794

Summary

Adds unit tests for HighValueCargoMultiSigModal with the useHighValueCargoApproval hook mocked, covering render states, signature threshold logic, the acknowledgement flow, the deadline countdown and keyboard accessibility.

Depends on #901

The modal, hook and API response fixtures under test are introduced by #901, which is not merged yet. This PR is opened as a draft and contains only the test file. Until #901 lands, this suite cannot resolve its imports on main. After #901 merges I will rebase this branch and mark it ready for review.

#901 also adds a service-level test file at components/escrow/__tests__/HighValueCargoMultiSigModal.test.tsx, the same path this issue specifies. When rebasing, I'll keep both suites by moving #901's version to HighValueCargoMultiSigModal.integration.test.tsx.

What is tested

33 test cases in components/escrow/__tests__/HighValueCargoMultiSigModal.test.tsx:

Area	Cases
Rendering	closed state, accessible dialog in a portal, loading, load error with retry, fallback error
Signer list and risk banner	signers with name/role/key/status, rejected signers, cross-border banner with value, risk level and factors, domestic shipments, signature progress
Deadline countdown	time remaining, multi-day format, expired window blocks submission
Signature threshold	disabled below threshold (plural and singular hint), disabled at threshold until acknowledged, enabled once threshold met and acknowledged
Acknowledgement	check, uncheck, Space key
Submission	submitting state locks controls, API error shown, onSubmitted passed to the hook
Closing	Escape, Escape ignored while submitting, close button, Cancel, backdrop, backdrop ignored while submitting
Keyboard and focus	initial focus and scroll lock, Tab/Shift+Tab wrap, Shift+Tab from container, normal Tab inside, no focusable controls, focus restored to trigger

Acceptance criteria

• Minimum 10 test cases: 33.
• Tests mock useHighValueCargoApproval: jest.mock on the hook module; formatCountdown stays real.
• Keyboard accessibility tested: Escape, Space, Tab and Shift+Tab focus trap, focus restoration.
• Coverage > 90%: HighValueCargoMultiSigModal.tsx at 100% statements, 100% lines, 100% functions, 98.59% branches. The one uncovered branch shortens keys of 12 characters or fewer, which Stellar public keys never are.
• No inline mock objects: hook state is derived from the recorded API responses in hooks/__tests__/fixtures/highValueCargoApiResponses.ts from feat(escrow): create high-value cargo multi-signature approval modal #901.

Screenshots

All tests passing with coverage, run with #901 applied:

Notes

CI on main currently fails at the Lint step due to existing errors in app/page.tsx, components/escrow/__tests__/CheckoutFlow.keyboard.test.tsx and __tests__/landingPage.test.tsx (details in #794). Until #901 is merged, this PR's own test file will also fail to import on main.

Disclosure

AI assistance (Claude) was used to write these tests. Tests were run and pass locally with #901 applied.

[drips-wave]

@Deb-Auth Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

Learn more about application limits