test(stream_io): add test for test_download_url

Signed-off-by: Robin H. Johnson <[email protected]>

tests/test_stream_io.py

@@ -169,6 +169,20 @@ def test_upload(self):
         s.close()
         self.assert_bucket_contents(key, long_string)
 
+    def test_download_url(self):
+        # s3_download_url does interesting things with passing a config, so
+        # needs specific test handling.
+        with mock_server() as endpoint:
+            key = "model.tensors"
+            with stream_io.s3_download_url(
+                path_uri=f"s3://{self.BUCKET_NAME}/{key}",
+                s3_access_key_id="X",
+                s3_secret_access_key="X",
+                s3_endpoint=endpoint,
+            ) as s:
+                print(s)
+                self.assertEqual(s, 'DEBUG')
+
     def test_download(self):
         # CURLStreamFiles ignore moto's normal mocks, since moto still
         # generates a real URL when a real endpoint is used, so instead