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"""Unittests for heapq."""
from test.test_support import verify, vereq, verbose, TestFailed
from heapq import heappush, heappop
import random
def check_invariant(heap):
# Check the heap invariant.
for pos, item in enumerate(heap):
if pos: # pos 0 has no parent
parentpos = (pos-1) >> 1
verify(heap[parentpos] <= item)
def test_main():
# 1) Push 100 random numbers and pop them off, verifying all's OK.
heap = []
data = []
check_invariant(heap)
for i in range(256):
item = random.random()
data.append(item)
heappush(heap, item)
check_invariant(heap)
results = []
while heap:
item = heappop(heap)
check_invariant(heap)
results.append(item)
data_sorted = data[:]
data_sorted.sort()
vereq(data_sorted, results)
# 2) Check that the invariant holds for a sorted array
check_invariant(results)
# 3) Naive "N-best" algorithm
heap = []
for item in data:
heappush(heap, item)
if len(heap) > 10:
heappop(heap)
heap.sort()
vereq(heap, data_sorted[-10:])
# Make user happy
if verbose:
print "All OK"
if __name__ == "__main__":
test_main()
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