test(genai-samples): test genai samples

Author: Sita04

genai/text_generation/txt_gen.py

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+from google import genai
+
+client = genai.Client(http_options={'api_version': 'v1'})
+response = client.models.generate_content(
+    model="gemini-2.0-flash-001",
+    contents="How does AI work?"
+)
+print(response.text)
+# Example response:
+# Okay, let's break down how AI works. It's a broad field, so I'll focus on the ...
+#
+# Here's a simplified overview:
+# ...