Equally slice splitt a list based on step

slices.py

def getSlices(l, step):
#    stepCount, rest = divmod(len(l) - 1, step)
    rest = (len(l) - 1) % step
    if not rest:
        return l[::step]
    stepCount = len(l) // (rest + 1)
    indexes = [0]
    maxIndex = len(l)
    i = 0
    # maybe done = step for short/odd lists?
    done = 0
    while True:
        i += step
        done += step
        if done >= stepCount:
            done = 0
            i += 1
        if i >= maxIndex:
            break
        indexes.append(int(round(i)))
    if i <= maxIndex:
        indexes.append(-1)
    print(i, maxIndex, stepCount, rest)
    return [l[i] for i in indexes]

tests = [(0, 11, 1, 2), (0, 10, 1, 2), (0, 21, 1, 3), (1, 22, 1, 3), (0, 25, 1, 5), (0, 101, 1, 3)]

for minimum, ext, rangeStep, step in tests:
    l = list(range(minimum, ext, rangeStep))
    print('Source list ({}..{}): {}\nStep: {}\nResult: {}\n'.format(minimum, ext - 1,l, step, getSlices(l, step)))