Skip symlink sibling test on Windows without symlink support

AUTHORS

@@ -320,6 +320,7 @@ Mike Hoyle (hoylemd)
 Mike Lundy
 Milan Lesnek
 Miro Hrončok
+Mulat Mekonen
 mrbean-bremen
 Nathan Goldbaum
 Nathan Rousseau

changelog/13771.contrib.rst

@@ -0,0 +1 @@
+Skip `test_do_not_collect_symlink_siblings` on Windows environments without symlink support to avoid false negatives.

testing/test_collection.py

@@ -1871,7 +1871,8 @@ def test_do_not_collect_symlink_siblings(
     """
     # Use tmp_path because it creates a symlink with the name "current" next to the directory it creates.
     symlink_path = tmp_path.parent / (tmp_path.name[:-1] + "current")
-    assert symlink_path.is_symlink() is True
+    if not symlink_path.is_symlink():  # pragma: no cover
+        pytest.skip("Symlinks not supported in this environment")
 
     # Create test file.
     tmp_path.joinpath("test_foo.py").write_text("def test(): pass", encoding="UTF-8")