Add tests for legacy load by url and fix bugs (#19078)

tests/test_modeling_common.py

@@ -33,6 +33,7 @@ import numpy as np
 
 import transformers
 from huggingface_hub import HfFolder, delete_repo, set_access_token
+from huggingface_hub.file_download import http_get
 from requests.exceptions import HTTPError
 from transformers import (
     AutoConfig,
@@ -2949,6 +2950,26 @@ class ModelUtilsTest(TestCasePlus):
             # This check we did call the fake head request
             mock_head.assert_called()
 
+    def test_load_from_one_file(self):
+        try:
+            tmp_file = tempfile.mktemp()
+            with open(tmp_file, "wb") as f:
+                http_get(
+                    "https://huggingface.co/hf-internal-testing/tiny-random-bert/resolve/main/pytorch_model.bin", f
+                )
+
+            config = BertConfig.from_pretrained("hf-internal-testing/tiny-random-bert")
+            _ = BertModel.from_pretrained(tmp_file, config=config)
+        finally:
+            os.remove(tmp_file)
+
+    def test_legacy_load_from_url(self):
+        # This test is for deprecated behavior and can be removed in v5
+        config = BertConfig.from_pretrained("hf-internal-testing/tiny-random-bert")
+        _ = BertModel.from_pretrained(
+            "https://huggingface.co/hf-internal-testing/tiny-random-bert/resolve/main/pytorch_model.bin", config=config
+        )
+
 
 @require_torch
 @is_staging_test