def test_update():
c = Settings()
c.update({'key': 'value'})
assert len(c) == 1 and c['key'] == 'value'
c.update({'key': 'value2', 'key2': 'value'})
assert len(c) == 2 and c['key'] == 'value2' and c['key2'] == 'value'
def test_update_by_base_c():
c1 = Settings({'k1': 'c1_k1'})
c2 = Settings({'k1': 'c2_k1', 'k2': 'c2_k2'}, k3='c2_k3')
c1.update(c2)
assert len(c1) == 3
assert c1['k1'] == 'c2_k1'
assert c1['k2'] == 'c2_k2'
assert c1['k3'] == 'c2_k3'