Useful answers before the next action
The goal was straightforward: help someone decide what needs attention without making them interpret a misleading status. The changes preserve the app's existing signing and backup architecture.
1. Show the actual expiry state
A missing certificate expiry previously appeared valid. A certificate with only hours left could appear expired. The updated logic reports unknown expiry separately and warns about less than a day remaining until the actual expiration time.
Inspect the signing fix and boundary tests
Previously, daysRemaining ?? Int.max produced a valid status when the date was missing. Truncating a positive interval to zero whole days also triggered the expired branch. The new helper checks the date and remaining seconds before choosing a status.
Before: missing-date fallback · Before: whole-day conversion · After: explicit expiry decisions · Tests: missing, past, exact and sub-day expiry.
2. Separate empty backups from unreadable backups
A failed directory read previously cleared the displayed backup list. Now the app preserves the last list, explains that the current list is unavailable, and offers a retry. A folder that has never been created can still be genuinely empty.
Inspect the backup fix and filesystem tests
The old try? path discarded the error and assigned an empty array. The new listing result distinguishes files from an unavailable read; the view checks that error before showing the empty state.
Before: errors became empty lists · After: explicit read outcomes · After: unavailable message and retry · Tests: missing, empty, populated and invalid directories.
3. Handle unusual dates deliberately
A future check timestamp could previously look fresh after a clock change. The updated logic refreshes that observation and checks finite values and integer bounds before converting an expiry into whole days.
Inspect the date guards and extreme-value tests
The earlier freshness condition accepted negative elapsed time. The new helper refreshes future or invalid observations. The expiry helper rejects nonfinite or unrepresentable future intervals before converting to Int.
Before: freshness comparison · After: conversion guards · After: refresh decisions · Tests: six-hour boundary, clock reversal and extreme dates.
Evidence you can check
The native CI run for commit 478f525 passed 29 Swift readiness and filesystem checks and completed the Xcode archive. These checks exercise the pure decision helpers and temporary directories; they are not device interaction tests.
Download the public evidence index (JSON) for the pinned source references, tested scope and remaining limits.
Keep the conclusion precise
This work establishes clearer status decisions and defensive date handling. It makes no CVE, new vulnerability, exploit or performance-gain claim.
VERIFICATION BOUNDARY
A successful archive does not verify installation, signing, guest-app launch, restore success or the interface on a physical device. A listed backup is not proof that it can be restored. Those checks remain separate from this case study.
The lesson is reusable: make unknown states visible, keep errors distinct from empty results, and test the boundaries before turning observations into advice.