Further document cygpath test parameter collections

test/test_util.py

@@ -258,14 +258,15 @@ def _xfail_param(*values, **xfail_kwargs):
     (R"D:/Apps\fOO", "/cygdrive/d/Apps/fOO"),
     (R"D:\Apps/123", "/cygdrive/d/Apps/123"),
 )
+"""Path test cases for cygpath and decygpath, other than extended UNC paths."""
 
 _unc_cygpath_pairs = (
     (R"\\?\a:\com", "/cygdrive/a/com"),
     (R"\\?\a:/com", "/cygdrive/a/com"),
     (R"\\?\UNC\server\D$\Apps", "//server/D$/Apps"),
 )
+"""Extended UNC path test cases for cygpath."""
 
-# Mapping of expected failures for the test_cygpath_ok test.
 _cygpath_ok_xfails = {
     # From _norm_cygpath_pairs:
     (R"C:\Users", "/cygdrive/c/Users"): "/proc/cygdrive/c/Users",
@@ -279,9 +280,9 @@ def _xfail_param(*values, **xfail_kwargs):
     (R"\\?\a:\com", "/cygdrive/a/com"): "/proc/cygdrive/a/com",
     (R"\\?\a:/com", "/cygdrive/a/com"): "/proc/cygdrive/a/com",
 }
+"""Mapping of expected failures for the test_cygpath_ok test."""
 
 
-# Parameter sets for the test_cygpath_ok test.
 _cygpath_ok_params = [
     (
         _xfail_param(*case, reason=f"Returns: {_cygpath_ok_xfails[case]!r}", raises=AssertionError)
@@ -290,6 +291,7 @@ def _xfail_param(*values, **xfail_kwargs):
     )
     for case in _norm_cygpath_pairs + _unc_cygpath_pairs
 ]
+"""Parameter sets for the test_cygpath_ok test."""
 
 
 @pytest.mark.skipif(sys.platform != "cygwin", reason="Paths specifically for Cygwin.")