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src/StellaOps.Vexer.Export.Tests/VexExportCacheServiceTests.cs

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+using Microsoft.Extensions.Logging.Abstractions;
+using StellaOps.Vexer.Core;
+using StellaOps.Vexer.Export;
+using StellaOps.Vexer.Storage.Mongo;
+
+namespace StellaOps.Vexer.Export.Tests;
+
+public sealed class VexExportCacheServiceTests
+{
+    [Fact]
+    public async Task InvalidateAsync_RemovesEntry()
+    {
+        var cacheIndex = new RecordingIndex();
+        var maintenance = new StubMaintenance();
+        var service = new VexExportCacheService(cacheIndex, maintenance, NullLogger<VexExportCacheService>.Instance);
+
+        var signature = new VexQuerySignature("format=json|provider=vendor");
+        await service.InvalidateAsync(signature, VexExportFormat.Json, CancellationToken.None);
+
+        Assert.Equal(signature.Value, cacheIndex.LastSignature?.Value);
+        Assert.Equal(VexExportFormat.Json, cacheIndex.LastFormat);
+        Assert.Equal(1, cacheIndex.RemoveCalls);
+    }
+
+    [Fact]
+    public async Task PruneExpiredAsync_ReturnsCount()
+    {
+        var cacheIndex = new RecordingIndex();
+        var maintenance = new StubMaintenance { ExpiredCount = 3 };
+        var service = new VexExportCacheService(cacheIndex, maintenance, NullLogger<VexExportCacheService>.Instance);
+
+        var removed = await service.PruneExpiredAsync(DateTimeOffset.UtcNow, CancellationToken.None);
+
+        Assert.Equal(3, removed);
+    }
+
+    [Fact]
+    public async Task PruneDanglingAsync_ReturnsCount()
+    {
+        var cacheIndex = new RecordingIndex();
+        var maintenance = new StubMaintenance { DanglingCount = 2 };
+        var service = new VexExportCacheService(cacheIndex, maintenance, NullLogger<VexExportCacheService>.Instance);
+
+        var removed = await service.PruneDanglingAsync(CancellationToken.None);
+
+        Assert.Equal(2, removed);
+    }
+
+    private sealed class RecordingIndex : IVexCacheIndex
+    {
+        public VexQuerySignature? LastSignature { get; private set; }
+        public VexExportFormat LastFormat { get; private set; }
+        public int RemoveCalls { get; private set; }
+
+        public ValueTask<VexCacheEntry?> FindAsync(VexQuerySignature signature, VexExportFormat format, CancellationToken cancellationToken)
+            => ValueTask.FromResult<VexCacheEntry?>(null);
+
+        public ValueTask SaveAsync(VexCacheEntry entry, CancellationToken cancellationToken)
+            => ValueTask.CompletedTask;
+
+        public ValueTask RemoveAsync(VexQuerySignature signature, VexExportFormat format, CancellationToken cancellationToken)
+        {
+            LastSignature = signature;
+            LastFormat = format;
+            RemoveCalls++;
+            return ValueTask.CompletedTask;
+        }
+    }
+
+    private sealed class StubMaintenance : IVexCacheMaintenance
+    {
+        public int ExpiredCount { get; set; }
+        public int DanglingCount { get; set; }
+
+        public ValueTask<int> RemoveExpiredAsync(DateTimeOffset asOf, CancellationToken cancellationToken)
+            => ValueTask.FromResult(ExpiredCount);
+
+        public ValueTask<int> RemoveMissingManifestReferencesAsync(CancellationToken cancellationToken)
+            => ValueTask.FromResult(DanglingCount);
+    }
+}