Apply typing to all of pre-commit-hooks
diff --git a/tests/sort_simple_yaml_test.py b/tests/sort_simple_yaml_test.py
index 176d12f..72f5bec 100644
--- a/tests/sort_simple_yaml_test.py
+++ b/tests/sort_simple_yaml_test.py
@@ -110,9 +110,9 @@
lines = ['# some comment', '"a": 42', 'b: 17', '', 'c: 19']
assert first_key(lines) == 'a": 42'
- # no lines
+ # no lines (not a real situation)
lines = []
- assert first_key(lines) is None
+ assert first_key(lines) == ''
@pytest.mark.parametrize('bad_lines,good_lines,_', TEST_SORTS)