Forbid the combination of unique and ignore case options per maintainers comments in #794. Removes a test that is no longer valid now that this combination is no longer supported. Closes #794.

pre_commit_hooks/file_contents_sorter.py

@@ -65,6 +65,11 @@ def main(argv: Sequence[str] | None = None) -> int:
     )
     args = parser.parse_args(argv)
 
+    if args.ignore_case and args.unique:
+        print('ERROR: usage of --unique and --ignore-case is unsupported. \
+        Please update your configuration.')
+        return FAIL
+
     retv = PASS
 
     for arg in args.filenames:

tests/file_contents_sorter_test.py

@@ -68,12 +68,6 @@ from pre_commit_hooks.file_contents_sorter import PASS
         (
             b'fee\nFie\nFoe\nfum\n',
             ['--unique', '--ignore-case'],
-            PASS,
-            b'fee\nFie\nFoe\nfum\n',
-        ),
-        (
-            b'fee\nfee\nFie\nFoe\nfum\n',
-            ['--unique', '--ignore-case'],
             FAIL,
             b'fee\nFie\nFoe\nfum\n',
         ),