Restructure solution layout by module

src/Concelier/__Tests/StellaOps.Concelier.Models.Tests/SeverityNormalizationTests.cs

@@ -0,0 +1,36 @@
+using StellaOps.Concelier.Models;
+
+namespace StellaOps.Concelier.Models.Tests;
+
+public sealed class SeverityNormalizationTests
+{
+    [Theory]
+    [InlineData("CRITICAL", "critical")]
+    [InlineData("Important", "high")]
+    [InlineData("moderate", "medium")]
+    [InlineData("Minor", "low")]
+    [InlineData("Info", "informational")]
+    [InlineData("negligible", "none")]
+    [InlineData("unknown", "unknown")]
+    [InlineData("Sev Critical", "critical")]
+    [InlineData("HIGH vendor", "high")]
+    [InlineData("Informative", "informational")]
+    [InlineData("Not Applicable", "none")]
+    [InlineData("Undetermined", "unknown")]
+    [InlineData("Priority 0", "critical")]
+    [InlineData("Priority-2", "medium")]
+    [InlineData("N/A", "none")]
+    [InlineData("custom-level", "custom-level")]
+    public void Normalize_ReturnsExpectedCanonicalValue(string input, string expected)
+    {
+        var normalized = SeverityNormalization.Normalize(input);
+        Assert.Equal(expected, normalized);
+    }
+
+    [Fact]
+    public void Normalize_ReturnsNullWhenInputNullOrWhitespace()
+    {
+        Assert.Null(SeverityNormalization.Normalize(null));
+        Assert.Null(SeverityNormalization.Normalize("   "));
+    }
+}