diff --git a/py_src/jupyter_lsp/tests/test_paths.py b/py_src/jupyter_lsp/tests/test_paths.py
index a115ae840..0a0a8d0f7 100644
--- a/py_src/jupyter_lsp/tests/test_paths.py
+++ b/py_src/jupyter_lsp/tests/test_paths.py
@@ -32,13 +32,13 @@ def test_normalize_posix_path_home_subdir(
     assert normalized_uri(root_dir) == expected_root_uri
 
 
-@pytest.mark.skipif(~WIN, reason="can't test Windows paths on POSIX")
+@pytest.mark.skipif(not WIN, reason="can't test Windows paths on POSIX")
 @pytest.mark.parametrize(
     "root_dir, expected_root_uri",
     [
         ["c:\\Users\\user1", "file:///c:/Users/user1"],
         ["C:\\Users\\user1", "file:///c:/Users/user1"],
-        ["//VBOXSVR/shared-folder", "file://vboxsvr/shared-folder"],
+        ["//VBOXSVR/shared-folder", "file://vboxsvr/shared-folder/"],
     ],
 )
 def test_normalize_windows_path_case(root_dir, expected_root_uri):  # pragma: no cover
@@ -58,12 +58,13 @@ def test_file_uri_to_path_posix(file_uri, expected_posix_path):  # pragma: no co
     assert file_uri_to_path(file_uri) == expected_posix_path
 
 
-@pytest.mark.skipif(~WIN, reason="can't test Windows paths on POSIX")
+@pytest.mark.skipif(not WIN, reason="can't test Windows paths on POSIX")
 @pytest.mark.parametrize(
     "file_uri, expected_windows_path",
     [
-        ["file:///C:/Windows/System32/Drivers/etc", r"C:\Windows\System32\Drivers\etc"],
-        ["file:///C:/some%20dir/some%20file.txt", r"C:\some dir\some file.txt"],
+        # https://github.com/krassowski/jupyterlab-lsp/pull/305#issuecomment-665996145
+        ["file:///C:/Windows/System32/Drivers/etc", "C:/Windows/System32/Drivers/etc"],
+        ["file:///C:/some%20dir/some%20file.txt", "C:/some dir/some file.txt"],
     ],
 )
 def test_file_uri_to_path_windows(file_uri, expected_windows_path):  # pragma: no cover