test(acceptance): beoordeling escalation — both branches (S-14, refs #15)

Gherkin scenarios for the two branches: a beoordeling left unclaimed for 14 days
escalates to the teamlead, and one completed before the timer fires does not.
Driven through the escalation worker against an in-memory Flowable stand-in.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tests/acceptance/Steps/EenBeoordelingEscalerenSteps.cs

@@ -0,0 +1,44 @@
+using Acceptance.Support;
+using Big.Infrastructure;
+using Microsoft.Extensions.Logging.Abstractions;
+using Reqnroll;
+using Xunit;
+
+namespace Acceptance.Steps;
+
+/// <summary>Bindings for <c>EenBeoordelingEscaleren.feature</c> (S-14). Drives the escalation worker
+/// (<see cref="BeoordelingEscalatieProcessor"/>) against an in-memory Flowable stand-in; one instance
+/// per scenario. Escalation has no domain-aggregate surface — it only reassigns who may claim the
+/// still-open Beoordelen task — so the scenario asserts on the task's candidate group.</summary>
+[Binding]
+[Scope(Feature = "Een beoordeling escaleren")]
+public sealed class EenBeoordelingEscalerenSteps
+{
+    private readonly InMemoryEscalatieClient _flowable = new();
+    private string _processInstanceId = "";
+
+    [Given("a registration parked at the Beoordelen task for the behandelaar")]
+    public void GivenARegistrationParkedForTheBehandelaar()
+        => _processInstanceId = _flowable.ParkBeoordeling();
+
+    [When("the 14-day escalation timer fires")]
+    public void WhenTheEscalationTimerFires()
+        => _flowable.FireEscalationTimer(_processInstanceId);
+
+    [When("the behandelaar completes the beoordeling before the timer fires")]
+    public void WhenTheBehandelaarCompletesBeforeTheTimer()
+        => _flowable.CompleteBeoordeling(_processInstanceId);
+
+    [When("the escalation worker runs")]
+    public async Task WhenTheEscalationWorkerRuns()
+        => await new BeoordelingEscalatieProcessor(
+            _flowable, NullLogger<BeoordelingEscalatieProcessor>.Instance).PumpOnceAsync(5);
+
+    [Then("the beoordeling is reassigned to the teamlead")]
+    public void ThenTheBeoordelingIsReassignedToTheTeamlead()
+        => Assert.Equal("teamlead", _flowable.CandidateGroupFor(_processInstanceId));
+
+    [Then("the beoordeling stays with the behandelaar")]
+    public void ThenTheBeoordelingStaysWithTheBehandelaar()
+        => Assert.Equal("behandelaar", _flowable.CandidateGroupFor(_processInstanceId));
+}