add test for hash filenames

tests/basic/test_wholefile.py

@@ -246,6 +246,44 @@ after b
         self.assertEqual(fname_a.read_text(), "after a\n")
         self.assertEqual(fname_b.read_text(), "after b\n")
 
+    def test_update_hash_filename(self):
+        fname_a = Path("a.txt")
+        fname_b = Path("b.txt")
+
+        fname_a.write_text("before a\n")
+        fname_b.write_text("before b\n")
+
+        response = """
+
+### a.txt
+```
+after a
+```
+
+### b.txt
+```
+after b
+```
+"""
+        # Initialize WholeFileCoder with the temporary directory
+        io = InputOutput(yes=True)
+        coder = WholeFileCoder(main_model=self.GPT35, io=io, fnames=[fname_a, fname_b])
+
+        # Set the partial response content with the updated content
+        coder.partial_response_content = response
+
+        # Call update_files method
+        edited_files = coder.apply_updates()
+
+        dump(edited_files)
+
+        # Check if the sample file was updated
+        self.assertIn(str(fname_a), edited_files)
+        self.assertIn(str(fname_b), edited_files)
+
+        self.assertEqual(fname_a.read_text(), "after a\n")
+        self.assertEqual(fname_b.read_text(), "after b\n")
+
     def test_update_named_file_but_extra_unnamed_code_block(self):
         sample_file = "hello.py"
         new_content = "new\ncontent\ngoes\nhere\n"