Write test for walk_files to check if it accepts Path-like and str objects

tests/unit/utils/test_utils.py

@@ -12,6 +12,7 @@ from dvc.utils import makedirs
 from dvc.utils import relpath
 from dvc.utils import to_chunks
 from dvc.utils import tmp_fname
+from dvc.utils import walk_files
 from tests.basic_env import TestDir
 
 
@@ -147,3 +148,7 @@ def test_relpath():
     path_info = PathInfo(path)
 
     assert relpath(path) == relpath(path_info)
+
+
+def test_walk_files(tmp_dir):
+    assert list(walk_files(".")) == list(walk_files(tmp_dir))