def test_combineFirst_mixed(self):
a = Series(['a','b'], index=range(2))
b = Series(range(2), index=range(2))
f = DataMatrix({'A' : a, 'B' : b})
a = Series(['a','b'], index=range(5, 7))
b = Series(range(2), index=range(5, 7))
g = DataMatrix({'A' : a, 'B' : b})
combined = f.combineFirst(g)
