Test failed: not equal:
  expected (left): [("a", 1); ("b", 2);]
  actual  (right): [("a", 1); ("b", 2); ("c", 3);]
differences:
[1m--- expected[0m
[1m+++ actual[0m
[36m@@ -1,1 +1,1 @@[0m
[31m-[("a", 1); ("b", 2);][0m
[32m+[("a", 1); ("b", 2); ("c", 3);][0m
