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from __future__ import unicode_literals
from prompt_toolkit.utils import take_using_weights
import itertools
def test_using_weights():
def take(generator, count):
return list(itertools.islice(generator, 0, count))
# Check distribution.
data = take(take_using_weights(['A', 'B', 'C'], [5, 10, 20]), 35)
assert data.count('A') == 5
assert data.count('B') == 10
assert data.count('C') == 20
assert data == [
'A', 'B', 'C', 'C', 'B', 'C', 'C', 'A', 'B', 'C', 'C', 'B', 'C',
'C', 'A', 'B', 'C', 'C', 'B', 'C', 'C', 'A', 'B', 'C', 'C',
'B', 'C', 'C', 'A', 'B', 'C', 'C', 'B', 'C', 'C']
# Another order.
data = take(take_using_weights(['A', 'B', 'C'], [20, 10, 5]), 35)
assert data.count('A') == 20
assert data.count('B') == 10
assert data.count('C') == 5
# Bigger numbers.
data = take(take_using_weights(['A', 'B', 'C'], [20, 10, 5]), 70)
assert data.count('A') == 40
assert data.count('B') == 20
assert data.count('C') == 10
# Negative numbers.
data = take(take_using_weights(['A', 'B', 'C'], [-20, 10, 0]), 70)
assert data.count('A') == 0
assert data.count('B') == 70
assert data.count('C') == 0
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