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test: issue #2 add 2 unit tests to cycle_sort() #1

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test: issue #2 add 2 unit tests to cycle_sort() #1

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20 changes: 14 additions & 6 deletions sorts/cycle_sort.py
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Original file line number Diff line number Diff line change
Expand Up @@ -8,13 +8,10 @@ def cycle_sort(array: list) -> list:
"""
>>> cycle_sort([4, 3, 2, 1])
[1, 2, 3, 4]

>>> cycle_sort([-4, 20, 0, -50, 100, -1])
[-50, -4, -1, 0, 20, 100]

>>> cycle_sort([-.1, -.2, 1.3, -.8])
[-0.8, -0.2, -0.1, 1.3]

>>> cycle_sort([])
[]
"""
Expand All @@ -29,7 +26,12 @@ def cycle_sort(array: list) -> list:

if pos == cycle_start:
continue


"""
the place that the current element should be
switched to are already occupied by element with
same value
"""
while item == array[pos]:
pos += 1

Expand All @@ -39,7 +41,11 @@ def cycle_sort(array: list) -> list:
for i in range(cycle_start + 1, array_len):
if array[i] < item:
pos += 1

"""
In the second turn of switching, the place that
the current element should be switched to are already
occupied by element with same value
"""
while item == array[pos]:
pos += 1

Expand All @@ -49,5 +55,7 @@ def cycle_sort(array: list) -> list:


if __name__ == "__main__":
assert cycle_sort([3, 3, 3, 3, 2]) == [2, 3, 3, 3, 3]
assert cycle_sort([3, 2, 3, 3, 3, 2, 1]) == [1, 2, 2, 3, 3, 3, 3]
assert cycle_sort([4, 5, 3, 2, 1]) == [1, 2, 3, 4, 5]
assert cycle_sort([0, 1, -10, 15, 2, -2]) == [-10, -2, 0, 1, 2, 15]
assert cycle_sort([0, 1, -10, 15, 2, -2]) == [-10, -2, 0, 1, 2, 15]