test,fix: work around resolve() bug in win py38,39

src/darker/tests/test_main.py

@@ -8,6 +8,7 @@
 import random
 import re
 import string
+import sys
 from argparse import ArgumentError
 from io import BytesIO
 from pathlib import Path
@@ -29,7 +30,7 @@
 from darker.verification import NotEquivalentError
 from darkgraylib.git import WORKTREE, RevisionRange
 from darkgraylib.testtools.highlighting_helpers import BLUE, CYAN, RESET, WHITE, YELLOW
-from darkgraylib.utils import TextDocument, joinlines
+from darkgraylib.utils import WINDOWS, TextDocument, joinlines
 
 pytestmark = pytest.mark.usefixtures("find_project_root_cache_clear")
 
@@ -945,12 +946,16 @@ def test_stdout_path_resolution(git_repo, capsys):
 
 
 @pytest.mark.parametrize("newline", ["\n", "\r\n"], ids=["unix", "windows"])
-def test_stdout_newlines(capsysbinary, newline):
+def test_stdout_newlines(tmp_path, monkeypatch, capsysbinary, newline):
     """When using ``--stdout``, newlines are not duplicated.
 
     See: https://github.com/akaihola/darker/issues/604
 
     """
+    if WINDOWS and sys.version_info < (3, 10):
+        # See https://bugs.python.org/issue38671
+        monkeypatch.chdir(tmp_path)
+        Path("new-file.py").touch()
     code = f"import collections{newline}import sys{newline}".encode()
     with patch("sys.stdin.buffer.read", return_value=code):
 
@@ -963,12 +968,16 @@ def test_stdout_newlines(capsysbinary, newline):
 
 
 @pytest.mark.parametrize("newline", ["\n", "\r\n"], ids=["unix", "windows"])
-def test_stdout_newlines_subprocess(newline):
+def test_stdout_newlines_subprocess(tmp_path, monkeypatch, newline):
     """When using ``--stdout``, newlines are not duplicated.
 
     See: https://github.com/akaihola/darker/issues/604
 
     """
+    if WINDOWS and sys.version_info < (3, 10):
+        # See https://bugs.python.org/issue38671
+        monkeypatch.chdir(tmp_path)
+        Path("new-file.py").touch()
     code = f"import collections{newline}import sys{newline}".encode()
     try: