def test():
dict1 = {"a": {"a1": 1}}
dict2 = {"a": {"b1": 1}}
solution = {'a': {"a1": 1, "b1": 1}}
answer = merge(dict1, dict2)
assert answer == solution
def test():
dict1 = {"a": 1}
dict2 = {"b": 1}
solution = {'a': 1, 'b': 1}
answer = merge(dict1, dict2)
assert answer == solution