Nomad changes

docs/snippets/python/plugins/plugin_testing.md

@@ -0,0 +1,14 @@
+```python title="Python"
+import pytest
+from kreuzberg import ExtractionResult
+
+def test_custom_extractor() -> None:
+    extractor = CustomJsonExtractor()
+    json_data: bytes = b'{"message": "Hello, world!"}'
+    config: dict = {}
+    result: ExtractionResult = extractor.extract_bytes(
+        json_data, "application/json", config
+    )
+    assert "Hello, world!" in result.content
+    assert result.mime_type == "application/json"
+```