First tests in the project (src/test was absent). Add testRuntimeOnly
junit-platform-launcher (required by Gradle 9 to load the JUnit Platform),
then cover:
- VideoMetrics: duration parse, isShorts boundary, viewsPerHour clamp/
division, viewsPerSubRatio rounding & zero-guards (9 cases, pure)
- DashboardService.summary(): composes each domain service under the
right key (Mockito)
- PublishService.dashboardSummary(): status counts + recent capped at 5
12 tests, all green. No Spring context / DB needed — fast.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
