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Add test for merge stability

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This commit is contained in:
Raymond Hettinger 2007-02-19 07:30:21 +00:00
parent 45eb0f1419
commit 01b9881062
1 changed files with 15 additions and 0 deletions
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15
Lib/test/test_heapq.py
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@ -111,6 +111,21 @@ class TestHeap(unittest.TestCase):
self.assertEqual(sorted(chain(*inputs)), list(merge(*inputs))) self.assertEqual(sorted(chain(*inputs)), list(merge(*inputs)))
self.assertEqual(list(merge()), []) self.assertEqual(list(merge()), [])
def test_merge_stability(self):
class Int(int):
pass
inputs = [[], [], [], []]
for i in range(20000):
stream = random.randrange(4)
x = random.randrange(500)
obj = Int(x)
obj.pair = (x, stream)
inputs[stream].append(obj)
for stream in inputs:
stream.sort()
result = [i.pair for i in merge(*inputs)]
self.assertEqual(result, sorted(result))
def test_nsmallest(self): def test_nsmallest(self):
data = [(random.randrange(2000), i) for i in range(1000)] data = [(random.randrange(2000), i) for i in range(1000)]
for f in (None, lambda x: x[0] * 547 % 2000): for f in (None, lambda x: x[0] * 547 % 2000):