def test_Map_apply():
m = Map.fromkeys('abc', lambda x: x + 1)
n = Map({'a': 1, 'b': 2, 'c': 3})
o = m * n
assert o.v == {'a': 2, 'b': 3, 'c': 4}
def test_Map_fromkeys():
m = Map.fromkeys(['a', 'b', 'c'], 1)
assert isinstance(m, Map)
assert m.v == {'a': 1, 'b': 1, 'c': 1}
assert Map.fromkeys(['a']).v == {'a': None}
