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46 lines
1.3 KiB
Python
46 lines
1.3 KiB
Python
from __future__ import unicode_literals
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import itertools
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import pytest
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from prompt_toolkit.utils import take_using_weights
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def test_using_weights():
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def take(generator, count):
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return list(itertools.islice(generator, 0, count))
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# Check distribution.
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data = take(take_using_weights(['A', 'B', 'C'], [5, 10, 20]), 35)
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assert data.count('A') == 5
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assert data.count('B') == 10
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assert data.count('C') == 20
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assert data == [
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'A', 'B', 'C', 'C', 'B', 'C', 'C', 'A', 'B', 'C', 'C', 'B', 'C',
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'C', 'A', 'B', 'C', 'C', 'B', 'C', 'C', 'A', 'B', 'C', 'C',
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'B', 'C', 'C', 'A', 'B', 'C', 'C', 'B', 'C', 'C']
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# Another order.
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data = take(take_using_weights(['A', 'B', 'C'], [20, 10, 5]), 35)
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assert data.count('A') == 20
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assert data.count('B') == 10
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assert data.count('C') == 5
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# Bigger numbers.
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data = take(take_using_weights(['A', 'B', 'C'], [20, 10, 5]), 70)
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assert data.count('A') == 40
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assert data.count('B') == 20
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assert data.count('C') == 10
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# Negative numbers.
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data = take(take_using_weights(['A', 'B', 'C'], [-20, 10, 0]), 70)
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assert data.count('A') == 0
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assert data.count('B') == 70
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assert data.count('C') == 0
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# All zero-weight items.
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with pytest.raises(ValueError):
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take(take_using_weights(['A', 'B', 'C'], [0, 0, 0]), 70)
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