dvc: rename tree -> fs (#5461)

tests/func/utils/test_fs.py

@@ -0,0 +1,36 @@
+import os
+import stat
+
+import pytest
+
+from dvc.utils.fs import copyfile, makedirs
+
+
+@pytest.mark.skipif(os.name == "nt", reason="Not supported for Windows.")
+def test_makedirs_permissions(tmp_dir):
+    dir_mode = 0o755
+    intermediate_dir = "тестовая-директория"
+    test_dir = os.path.join(intermediate_dir, "data")
+
+    assert not os.path.exists(intermediate_dir)
+
+    makedirs(test_dir, mode=dir_mode)
+
+    assert stat.S_IMODE(os.stat(test_dir).st_mode) == dir_mode
+    assert stat.S_IMODE(os.stat(intermediate_dir).st_mode) == dir_mode
+
+
+def test_copyfile(tmp_dir):
+    src = "file1"
+    dest = "file2"
+    dest_dir = "testdir"
+
+    tmp_dir.gen(src, "file1contents")
+
+    os.mkdir(dest_dir)
+
+    copyfile(src, dest)
+    assert (tmp_dir / dest).read_text() == "file1contents"
+
+    copyfile(src, dest_dir)
+    assert (tmp_dir / dest_dir / src).read_text() == "file1contents"