chore: import upstream snapshot with attribution

tests/test_image_response.py

@@ -0,0 +1,29 @@
+import base64
+from types import SimpleNamespace
+import unittest
+from unittest.mock import patch
+
+from PIL import Image
+
+from tools.image_response import image_from_response_part
+
+
+class ImageResponseTests(unittest.TestCase):
+    def test_extracts_image_when_part_has_no_as_image_method(self):
+        expected = Image.new("RGB", (1, 1), (255, 0, 0))
+        with patch("tools.image_response.Image.open", return_value=expected):
+            part = SimpleNamespace(inline_data=SimpleNamespace(data=b"fake-png"))
+            image = image_from_response_part(part)
+        self.assertEqual(image.size, (1, 1))
+
+    def test_extracts_base64_data_url(self):
+        expected = Image.new("RGB", (1, 1), (255, 0, 0))
+        payload = "data:image/png;base64," + base64.b64encode(b"fake-png").decode("ascii")
+        with patch("tools.image_response.Image.open", return_value=expected):
+            part = {"inline_data": {"data": payload}}
+            image = image_from_response_part(part)
+        self.assertEqual(image.size, (1, 1))
+
+
+if __name__ == "__main__":
+    unittest.main()