sequenceDiagram
    box Test Environment (docker-compose.test.yaml)
    participant TestDB as SQL Server, isolated instance<br/>Biergarten Test Database<br/>no host port published
    participant TestSeaweedFS as seaweedfs<br/>S3-compatible object storage
    participant TestMig as Migrations (test)
    participant TestSeed as Seed (test)<br/>minimal: test.user only
    participant Specs as API.Specs<br/>Reqnroll + xUnit<br/>(integration tests)
    participant UnitTests as unit.tests<br/>xUnit + Moq<br/>Features.*.Tests, one container
    participant FrontendTests as frontend.tests<br/>Playwright/Vitest
    end
    participant Results as test-results/ (mounted volume)

    TestMig-->>TestDB: depends_on
    TestMig->>TestDB: Migrate
    TestSeed-->>TestMig: depends_on
    TestSeed-->>TestSeaweedFS: depends_on
    TestSeed->>TestDB: Seed

    par Specs
        Specs-->>TestSeed: depends_on
        Specs->>TestDB: Integration test
        Specs->>Results: Export TRX
    and unit.tests
        UnitTests-->>TestSeed: depends_on
        UnitTests-->>TestDB: depends_on (startup ordering only, no real connection)
        UnitTests->>Results: Export TRX, one per slice
    and frontend.tests
        FrontendTests->>Results: Export results
    end