mirror of
https://github.com/wassname/catalyst.git
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Scott Sanderson
58ceb7b7bb
- Moved zipline.utils.lazyval. - Added `remember_last` which is just `lru_cache(1)` with simpler logic.
35 lines
1.1 KiB
Python
35 lines
1.1 KiB
Python
"""
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Tests for zipline.utils.memoize.
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"""
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from unittest import TestCase
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from zipline.utils.memoize import remember_last
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class TestRememberLast(TestCase):
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def test_remember_last(self):
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# Store the count in a list so we can mutate it from inside `func`.
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call_count = [0]
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@remember_last
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def func(x):
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call_count[0] += 1
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return x
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self.assertEqual((func(1), call_count[0]), (1, 1))
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# Calling again with the same argument should just re-use the old
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# value, which means func shouldn't get called again.
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self.assertEqual((func(1), call_count[0]), (1, 1))
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self.assertEqual((func(1), call_count[0]), (1, 1))
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# Calling with a new value should increment the counter.
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self.assertEqual((func(2), call_count[0]), (2, 2))
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self.assertEqual((func(2), call_count[0]), (2, 2))
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# Calling the old value should still increment the counter.
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self.assertEqual((func(1), call_count[0]), (1, 3))
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self.assertEqual((func(1), call_count[0]), (1, 3))
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