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LibreMail/scripts/device-testing/tests/fixtures/ui_mailbox.xml
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JMR-devandClaude Opus 4.8 e436503eaf feat(scripts): device-testing perf harness 
Add a cross-platform, standard-library-only Python package under
scripts/device-testing/ that replicates LibreMail's on-device performance-test
scenarios and logging capture, codifying the methodology run by hand on
2026-07-05 (Pixel 10 Pro XL).

Modules:
- breadcrumbs.py: a pure, unit-tested parser for the ImapPerf / MailReader /
  Reader / MailBackfiller breadcrumbs, plus open-correlation that reproduces the
  manual timing-tables.md figures exactly.
- adb.py: a safety-guarded adb wrapper -- an allow-list of adb subcommands and a
  deny-list + assertions on shell commands. The only sanctioned app-state
  mutation is clearing LibreMail's own cache/ (exact-match); no pm clear /
  uninstall / data wipe, and no touching databases/ files/ shared_prefs/
  datastore/ can be constructed.
- uidump.py: uiautomator XML parser + screen recognition (mailbox rows with the
  cached "Available offline" flag, reader, and the keyguard / foreign-app guards).
- scenarios.py: cold-open, message-open (uncached), back-nav, prefetch A/B
  (fetch-policy toggle) and cross-provider, each keyguard-guarded and driven
  through the guarded wrapper.
- report.py + perf_harness.py: aggregates, a timing-tables.md renderer mirroring
  the manual write-up, and the CLI (timestamped run dir with the raw logcat, a
  filtered breadcrumb extract, and the tables). --dry-run prints the exact
  command plan without touching device state.

Tests (stdlib unittest, 68 cases) validate the parser, guardrails, UI
recognition and report against the manual run's real captures (fixtures include
a verbatim perf-extract slice and the reader/lockscreen/alarm dumps). Track the
*.log fixture past the gitignore *.log rule via a scoped negation.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-07-06 13:21:34 -05:00

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