Add repro.py to show the problem with streaming

Author: aabmass

repro.py

@@ -0,0 +1,35 @@
+# /// script
+# requires-python = ">=3.11"
+# dependencies = [
+#     "google-cloud-aiplatform",
+# ]
+# ///
+
+import vertexai
+
+from vertexai.generative_models import (
+    Content,
+    GenerativeModel,
+    Part,
+)
+
+
+def main() -> None:
+    vertexai.init(api_transport="rest")
+    model = GenerativeModel("gemini-1.5-flash-002")
+    res = list(
+        model.generate_content(
+            [
+                Content(
+                    role="invalid_role",
+                    parts=[Part.from_text("Say this is a test")],
+                )
+            ],
+            stream=True,
+        )
+    )
+    print(res)
+
+
+if __name__ == "__main__":
+    main()