def test_sum_string():
s = Series(["Hello", "there", "World"])
got = s.sum()
expected = "HellothereWorld"
assert got == expected
s = Series(["Hello", None, "World"])
got = s.sum()
expected = "HelloWorld"
assert got == expected
def test_sum(dtype, nelem):
dtype = cudf.dtype(dtype).type
data = gen_rand(dtype, nelem)
sr = Series(data)
got = sr.sum()
expect = data.sum()
significant = 4 if dtype == np.float32 else 6
np.testing.assert_approx_equal(expect, got, significant=significant)
