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src/BinaryIndex/__Tests/StellaOps.BinaryIndex.FixIndex.Tests/Parsers/PatchHeaderParserTests.cs

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+using FluentAssertions;
+using StellaOps.BinaryIndex.FixIndex.Models;
+using StellaOps.BinaryIndex.FixIndex.Parsers;
+
+namespace StellaOps.BinaryIndex.FixIndex.Tests.Parsers;
+
+public sealed class PatchHeaderParserTests
+{
+    [Fact]
+    public void ParsePatches_SkipsHeadersWithInvalidEncoding()
+    {
+        var options = new FixIndexParserOptions
+        {
+            PatchHeaderMaxLines = 3,
+            PatchHeaderMaxChars = 200,
+            PatchHeaderExcerptMaxLength = 120
+        };
+        var parser = new PatchHeaderParser(options, new FixedTimeProvider(DateTimeOffset.UnixEpoch));
+
+        var patches = new[]
+        {
+            ("CVE-2024-9999.patch", "Binary\0Content", "sha256")
+        };
+
+        var results = parser.ParsePatches(patches, "debian", "bookworm", "pkg", "1.0.0").ToList();
+
+        results.Should().BeEmpty();
+    }
+
+    [Fact]
+    public void ParsePatches_RespectsLimitsAndUsesFixedTime()
+    {
+        var line1 = "Description: Fix CVE-2024-3333";
+        var line2 = "Origin: upstream";
+        var line3 = "Bug: https://example.test";
+        var content = string.Join('\n', line1, line2, line3);
+
+        var options = new FixIndexParserOptions
+        {
+            PatchHeaderMaxLines = 2,
+            PatchHeaderMaxChars = 200,
+            PatchHeaderExcerptMaxLength = line1.Length,
+            PatchHeaderConfidence = 0.88m
+        };
+        var now = new DateTimeOffset(2025, 12, 30, 15, 0, 0, TimeSpan.Zero);
+        var parser = new PatchHeaderParser(options, new FixedTimeProvider(now));
+
+        var patches = new[]
+        {
+            ("patches/CVE-2024-3333.patch", content, "sha256")
+        };
+
+        var results = parser.ParsePatches(patches, "Ubuntu", "Jammy", "pkg", "1.0.0").ToList();
+
+        results.Should().HaveCount(1);
+        results[0].Distro.Should().Be("ubuntu");
+        results[0].Release.Should().Be("jammy");
+        results[0].Confidence.Should().Be(0.88m);
+        results[0].CreatedAt.Should().Be(now);
+
+        var evidence = (PatchHeaderEvidence)results[0].Evidence;
+        evidence.HeaderExcerpt.Should().Be(line1);
+    }
+}