Nomad changes

docs/snippets/csharp/plugin_testing.md

@@ -0,0 +1,19 @@
+```csharp title="C#"
+using Xunit;
+
+public class CustomExtractorTests
+{
+    [Fact]
+    public void TestCustomExtractor()
+    {
+        var extractor = new CustomJsonExtractor();
+        var jsonData = System.Text.Encoding.UTF8.GetBytes(@"{""message"": ""Hello, world!""}");
+        var config = new Dictionary<string, object>();
+
+        var result = extractor.ExtractBytes(jsonData, "application/json", config);
+
+        Assert.Contains("Hello, world!", (string)result["content"]);
+        Assert.Equal("application/json", (string)result["mime_type"]);
+    }
+}
+```