Fix getting and using participants

client/tests/types_test.py

@@ -0,0 +1,14 @@
+from pytest import mark
+from telethon._impl.client.types import AdminRight
+from telethon._impl.tl import types
+
+
+@mark.parametrize("slot", types.ChatAdminRights.__slots__)
+def test_admin_right_covers_all(slot: str) -> None:
+    kwargs = {slot: False for slot in types.ChatAdminRights.__slots__}
+    kwargs[slot] = True
+
+    rights = types.ChatAdminRights(**kwargs)
+    rights_set = AdminRight._from_raw(rights)
+    assert len(rights_set) == 1
+    assert next(iter(rights_set)).value == slot