def test_dataframe_nsmallest(nelem, n):
np.random.seed(0)
df = DataFrame()
df["a"] = aa = np.random.random(nelem)
df["b"] = bb = np.random.random(nelem)
res = df.nsmallest(n, "a")
# Check
inds = np.argsort(-aa)
assert_eq(res["a"].to_array(), aa[inds][-n:][::-1])
assert_eq(res["b"].to_array(), bb[inds][-n:][::-1])
assert_eq(res.index.values, inds[-n:][::-1])
