def test___eq__():
    assert (not (QQ[x] == ZZ[x]))
    assert (not (QQ.frac_field(x) == ZZ.frac_field(x)))
def test___eq__():
    assert (not (QQ[x] == ZZ[x]))
    assert (not (QQ.frac_field(x) == ZZ.frac_field(x)))