Restructure solution layout by module

src/Scanner/__Tests/StellaOps.Scanner.Sbomer.BuildXPlugin.Tests/Cas/LocalCasClientTests.cs

@@ -0,0 +1,34 @@
+using System.IO;
+using System.Security.Cryptography;
+using System.Threading;
+using System.Threading.Tasks;
+using StellaOps.Scanner.Sbomer.BuildXPlugin.Cas;
+using StellaOps.Scanner.Sbomer.BuildXPlugin.Tests.TestUtilities;
+using Xunit;
+
+namespace StellaOps.Scanner.Sbomer.BuildXPlugin.Tests.Cas;
+
+public sealed class LocalCasClientTests
+{
+    [Fact]
+    public async Task VerifyWriteAsync_WritesProbeObject()
+    {
+        await using var temp = new TempDirectory();
+        var client = new LocalCasClient(new LocalCasOptions
+        {
+            RootDirectory = temp.Path,
+            Algorithm = "sha256"
+        });
+
+        var result = await client.VerifyWriteAsync(CancellationToken.None);
+
+        Assert.Equal("sha256", result.Algorithm);
+        Assert.True(File.Exists(result.Path));
+
+        var bytes = await File.ReadAllBytesAsync(result.Path);
+        Assert.Equal("stellaops-buildx-probe"u8.ToArray(), bytes);
+
+        var expectedDigest = Convert.ToHexString(SHA256.HashData(bytes)).ToLowerInvariant();
+        Assert.Equal(expectedDigest, result.Digest);
+    }
+}