ImmutableMap.update: test, lint

letsencrypt/acme/jose/util.py

@@ -61,7 +61,7 @@ class ImmutableMap(collections.Mapping, collections.Hashable):
         """Return updated map."""
         items = dict(self)
         items.update(kwargs)
-        return type(self)(**items)
+        return type(self)(**items)  # pylint: disable=star-args
 
     def __getitem__(self, key):
         try:

letsencrypt/acme/jose/util_test.py

@@ -25,6 +25,10 @@ class ImmutableMapTest(unittest.TestCase):
         self.a2 = self.A(x=3, y=4)
         self.b = self.B(x=1, y=2)
 
+    def test_update(self):
+        self.assertEqual(self.A(x=2, y=2), self.a1.update(x=2))
+        self.assertEqual(self.a2, self.a1.update(x=3, y=4))
+
     def test_get_missing_item_raises_key_error(self):
         self.assertRaises(KeyError, self.a1.__getitem__, 'z')