def test_entropy_empty():
series = pd.Series([], dtype=float)
res = _entropy(series, False)
assert pytest.approx(res, 0.001) == 0
res_norm = _entropy(series, True)
assert pytest.approx(res_norm, 0.01) == 0
def test_entropy_string():
series = pd.Series(["hat", "jug", "hat"])
res = _entropy(series, False)
assert pytest.approx(res, 0.001) == 0.636
res_norm = _entropy(series, True)
assert pytest.approx(res_norm, 0.01) == 0.918
def test_entropy_ints():
series = pd.Series([0, 1, 2, 4])
res = _entropy(series, False)
assert pytest.approx(res, 0.001) == 1.386
res_norm = _entropy(series, True)
assert pytest.approx(res_norm, 0.01) == 1
