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src/Graph/__Tests/StellaOps.Graph.Api.Tests/AuditLoggerTests.cs

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+using System.Linq;
+using StellaOps.Graph.Api.Services;
+using Xunit;
+
+namespace StellaOps.Graph.Api.Tests;
+
+public class AuditLoggerTests
+{
+    [Fact]
+    public void LogsAndCapsSize()
+    {
+        var logger = new InMemoryAuditLogger();
+        for (var i = 0; i < 510; i++)
+        {
+            logger.Log(new AuditEvent(
+                Timestamp: DateTimeOffset.UnixEpoch.AddMinutes(i),
+                Tenant: "t",
+                Route: "/r",
+                Method: "POST",
+                Actor: "auth",
+                Scopes: new[] { "graph:query" },
+                StatusCode: 200,
+                DurationMs: 5));
+        }
+
+        var recent = logger.GetRecent();
+        Assert.True(recent.Count <= 100);
+        Assert.Equal(509, recent.First().Timestamp.Minute);
+    }
+}