up

src/StellaOps.Zastava.Observer.Tests/Runtime/ElfBuildIdReaderTests.cs

@@ -0,0 +1,60 @@
+using System.Linq;
+using StellaOps.Zastava.Observer.Runtime;
+using StellaOps.Zastava.Observer.Tests.TestSupport;
+using Xunit;
+
+namespace StellaOps.Zastava.Observer.Tests.Runtime;
+
+public sealed class ElfBuildIdReaderTests
+{
+    [Fact]
+    public async Task TryReadBuildIdAsync_ReturnsExpectedHex()
+    {
+        using var temp = new TempDirectory();
+        var elfPath = Path.Combine(temp.RootPath, "bin", "example");
+        var buildIdBytes = Enumerable.Range(0, 20).Select(static index => (byte)(index + 1)).ToArray();
+        ElfTestFileBuilder.CreateElfWithBuildId(elfPath, buildIdBytes);
+
+        var buildId = await ElfBuildIdReader.TryReadBuildIdAsync(elfPath, CancellationToken.None);
+
+        Assert.Equal(Convert.ToHexString(buildIdBytes).ToLowerInvariant(), buildId);
+    }
+
+    [Fact]
+    public async Task TryReadBuildIdAsync_InvalidFileReturnsNull()
+    {
+        using var temp = new TempDirectory();
+        var path = Path.Combine(temp.RootPath, "bin", "invalid");
+        Directory.CreateDirectory(Path.GetDirectoryName(path)!);
+        await File.WriteAllTextAsync(path, "not-an-elf");
+
+        var buildId = await ElfBuildIdReader.TryReadBuildIdAsync(path, CancellationToken.None);
+
+        Assert.Null(buildId);
+    }
+
+    private sealed class TempDirectory : IDisposable
+    {
+        public TempDirectory()
+        {
+            RootPath = Path.Combine(Path.GetTempPath(), "elf-buildid-tests", Guid.NewGuid().ToString("N"));
+            Directory.CreateDirectory(RootPath);
+        }
+
+        public string RootPath { get; }
+
+        public void Dispose()
+        {
+            try
+            {
+                if (Directory.Exists(RootPath))
+                {
+                    Directory.Delete(RootPath, recursive: true);
+                }
+            }
+            catch
+            {
+            }
+        }
+    }
+}