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src/StellaOps.Scanner.Core.Tests/Utility/ScannerIdentifiersTests.cs

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+using StellaOps.Scanner.Core.Utility;
+using Xunit;
+
+namespace StellaOps.Scanner.Core.Tests.Utility;
+
+public sealed class ScannerIdentifiersTests
+{
+    [Fact]
+    public void CreateJobId_IsDeterministicAndCaseInsensitive()
+    {
+        var first = ScannerIdentifiers.CreateJobId("registry.example.com/repo:latest", "SHA256:ABC", "Tenant-A", "salt");
+        var second = ScannerIdentifiers.CreateJobId("REGISTRY.EXAMPLE.COM/REPO:latest", "sha256:abc", "tenant-a", "salt");
+
+        Assert.Equal(first, second);
+    }
+
+    [Fact]
+    public void CreateDeterministicHash_ProducesLowercaseHex()
+    {
+        var hash = ScannerIdentifiers.CreateDeterministicHash("scan", "abc", "123");
+
+        Assert.Matches("^[0-9a-f]{64}$", hash);
+        Assert.Equal(hash, hash.ToLowerInvariant());
+    }
+
+    [Fact]
+    public void NormalizeImageReference_LowercasesRegistryAndRepository()
+    {
+        var normalized = ScannerIdentifiers.NormalizeImageReference("Registry.Example.com/StellaOps/Scanner:1.0");
+
+        Assert.Equal("registry.example.com/stellaops/scanner:1.0", normalized);
+    }
+}