tweak

tests/test_io.py

@@ -150,4 +150,4 @@ class TestFitsHeaderOps(unittest.TestCase):
         t = table.Table([{"a": 1, "b": 2}] * 5)
         meta = generate_meta(obs_id="123456")
         t = add_meta_to_table(t, meta)
-        self.assertEqual(set(t.colnames), ("a", "b", "healpix", "data_uuid"))
+        self.assertEqual(set(t.colnames), {"a", "b", "healpix", "data_uuid"})