Update gemini/gemini_extractor.py

gemini/gemini_extractor.py

@@ -78,4 +78,7 @@ class GeminiExtractor(Extractor):
         
         contents.append(Content.from_text(response_content))
         
-        return contents
+        return contents
+
+    def sample_input(self) -> Content:
+        return Content.from_text("Hello world, I am a good boy.")