vgearen f1b6b72d8d fix(critical): isolate AppStateTests from user's real data directory ...

PRIOR BEHAVIOR (data-loss bug):
AppStateTests.setUp() constructed AppState() directly, which used the real
~/Library/Application Support/Stockbar/ for stocks.json. Each test method
that did 'sut.stocks = [s1, s2]' triggered didSet → saveStocks → silently
overwrote the user's actual portfolio file with 2 test entries. backupIfNeeded
then rolled all 10 backup snapshots forward, eventually erasing every
historical copy of real data.

This destroyed a user's 29-stock portfolio when xcodebuild test was run
during Korean stock feature development (2026-05-14 10:08).

FIX:
- AppState gains a static appSupportDirOverride: URL? hook
- AppStateTests.setUp() creates a unique tmpDir, sets the override, tearDown
  resets and removes the directory
- Verified: after running all 7 AppStateTests, the real stocks.json is
  byte-identical to before the run.

This must land before any further test run touches AppState.

2026-05-14 10:35:01 +08:00

..

AppState.swift

fix(critical): isolate AppStateTests from user's real data directory

2026-05-14 10:35:01 +08:00