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58 lines
1.3 KiB
58 lines
1.3 KiB
from __future__ import print_function
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import os
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import random
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import unittest
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DEBUG = os.environ.get('DEBUG') == '1'
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def debug(msg):
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if DEBUG:
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print(msg)
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def insertion_sort(arr):
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debug('BEGIN')
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for j in range(1, len(arr)):
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key = arr[j]
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i = j - 1
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debug('FOR:\tj={}, key={}, i={}'.format(j, key, i))
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while i > -1 and arr[i] > key:
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arr[i + 1] = arr[i]
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debug('WHILE:\tset: arr[{}] = {}'.format(i + 1, arr[i]))
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i = i - 1
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arr[i + 1] = key
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debug('FOR:\tset: arr[{}] = {}'.format(i + 1, key))
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debug('END')
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return arr
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class TestStuff(unittest.TestCase):
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def test_insertion_sort_small(self):
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self.assertEqual(
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[1, 2, 3, 4, 5, 6],
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insertion_sort([5, 2, 4, 6, 1, 3])
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)
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def test_insertion_sort_large(self):
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inlist = range(1000)
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listcopy = inlist[:]
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random.shuffle(inlist)
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random.shuffle(inlist)
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self.assertEqual(listcopy, insertion_sort(inlist))
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def test_insertion_sort_large_reversed(self):
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inlist = range(1000)
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listcopy = inlist[:]
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self.assertEqual(listcopy, insertion_sort(list(reversed(inlist))))
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if __name__ == '__main__':
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unittest.main()
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