Update tests/tz/test_timezone.py

Co-authored-by: Ash Berlin-Taylor <ash_github@firemirror.com>

Author: Pebble32

tests/tz/test_timezone.py

@@ -417,6 +417,7 @@ def test_fixed_equality():
 
 def test_fixed_hash():
     assert hash(fixed_timezone(19800)) == hash(fixed_timezone(19800))
+    assert{fixed_timezone(19800) == FixedTimezone(19800, name="custom"), "Pre-condition: name ignored for FixedTimezone"
     assert len({fixed_timezone(19800), FixedTimezone(19800, name="custom")}) == 1