from corrlib import tools as tl


def test_m2k():
    for m in [0.1, 0.5, 1.0]:
        expected_k = 1 / (2 * m + 8)
        assert tl.m2k(m) == expected_k


def test_k2m():
    for m in [0.1, 0.5, 1.0]:
        assert tl.k2m(m) == (1/(2*m))-4


def test_k2m_m2k():
    for m in [0.1, 0.5, 1.0]:
        k = tl.m2k(m)
        m_converted = tl.k2m(k)
        assert abs(m - m_converted) < 1e-9


def test_str2list():
    assert tl.str2list("a,b,c") == ["a", "b", "c"]
    assert tl.str2list("1,2,3") == ["1", "2", "3"]


def test_list2str():
    assert tl.list2str(["a", "b", "c"]) == "a,b,c"
    assert tl.list2str(["1", "2", "3"]) == "1,2,3"