Ships the E2E infrastructure filed against task #199 (UnsTab drag-drop Playwright
smoke). The Blazor Server interactive-render assertion through a test-owned pipeline
needs a dedicated diagnosis pass — filed as task #242 — but the Playwright harness
lands here so that follow-up starts from a known-good scaffolding rather than
setting up the project from scratch.
## New project tests/ZB.MOM.WW.OtOpcUa.Admin.E2ETests
- AdminWebAppFactory — boots the Admin pipeline with Kestrel on a free loopback port,
swaps the SQL DbContext for EF Core InMemory, replaces the LDAP cookie auth with
TestAuthHandler, mirrors the Razor-components/auth/antiforgery pipeline, and seeds
a cluster + draft generation with areas warsaw / berlin and a line-a1 in warsaw.
Not a WebApplicationFactory<Program> because WAF's TestServer transport doesn't
coexist cleanly with Kestrel-on-a-real-port, which Playwright needs.
- TestAuthHandler — stamps every request with a FleetAdmin claim so tests hit
authenticated routes without the LDAP bind.
- PlaywrightFixture — one Chromium launch shared across tests; throws
PlaywrightBrowserMissingException when the binary isn't installed so tests can
Assert.Skip rather than fail hard.
- UnsTabDragDropE2ETests.Admin_host_serves_HTTP_via_Playwright_scaffolding — proves
the full stack comes up: Kestrel bind, InMemory DbContext, test auth, Playwright
navigation, Razor route pipeline responds with HTML < 500. One passing test.
## Prerequisite
Chromium must be installed locally:
pwsh tests/ZB.MOM.WW.OtOpcUa.Admin.E2ETests/bin/Debug/net10.0/playwright.ps1 install chromium
Absent the browser, the suite Assert.Skip's cleanly — CI without the install step
still reports green. Once installed, `dotnet test` runs the scaffolding smoke in ~12s.
## Follow-up (task #242)
Diagnose why `/clusters/{id}/draft/{gen}` → UNS-tab click → drag-drop flow times out
under the test-owned Program.cs replica. Candidate causes: route-ordering difference,
missing SignalR hub mapping timing, JS interop asset differences, culture middleware.
Once the interactive circuit boots, add:
- happy-path drag-drop assertion (source row → target area → Confirm → assert re-parent)
- 409 conflict variant (preview → external DB mutation → Confirm → assert red-header modal)
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