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src/AirGap/__Tests/StellaOps.AirGap.Controller.Tests/AirGapTelemetryTests.cs

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+using Microsoft.Extensions.Logging.Abstractions;
+using Microsoft.Extensions.Options;
+using StellaOps.AirGap.Controller.Domain;
+using StellaOps.AirGap.Controller.Options;
+using StellaOps.AirGap.Controller.Services;
+using StellaOps.AirGap.Time.Models;
+using Xunit;
+using OptionsFactory = Microsoft.Extensions.Options.Options;
+
+using StellaOps.TestKit;
+
+namespace StellaOps.AirGap.Controller.Tests;
+
+public sealed class AirGapTelemetryTests
+{
+    private static readonly DateTimeOffset FixedNow = new(2025, 12, 12, 10, 0, 0, TimeSpan.Zero);
+
+    [Trait("Category", TestCategories.Unit)]
+    [Fact]
+    public void Evicts_oldest_tenants_when_over_limit()
+    {
+        var options = OptionsFactory.Create(new AirGapTelemetryOptions { MaxTenantEntries = 2 });
+        var telemetry = new AirGapTelemetry(options, NullLogger<AirGapTelemetry>.Instance);
+
+        telemetry.RecordStatus("tenant-1", BuildStatus("tenant-1"));
+        telemetry.RecordStatus("tenant-2", BuildStatus("tenant-2"));
+        telemetry.RecordStatus("tenant-3", BuildStatus("tenant-3"));
+
+        Assert.Equal(2, telemetry.TenantCacheCount);
+    }
+
+    private static AirGapStatus BuildStatus(string tenantId)
+    {
+        var state = new AirGapState
+        {
+            TenantId = tenantId,
+            Sealed = true,
+            PolicyHash = "policy",
+            TimeAnchor = TimeAnchor.Unknown,
+            StalenessBudget = StalenessBudget.Default,
+            LastTransitionAt = FixedNow
+        };
+
+        var empty = new Dictionary<string, StalenessEvaluation>(StringComparer.OrdinalIgnoreCase);
+        return new AirGapStatus(state, StalenessEvaluation.Unknown, empty, FixedNow);
+    }
+}