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41 lines
1.1 KiB
Python
41 lines
1.1 KiB
Python
import unittest
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from cachelib import Cache
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class CacheContractTests(unittest.TestCase):
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def test_negative_lookup_is_loaded_once(self):
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cache = Cache()
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calls = []
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def loader(key):
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calls.append(key)
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return None
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self.assertIsNone(cache.get_or_load("missing", loader))
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self.assertIsNone(cache.get_or_load("missing", loader))
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self.assertEqual(calls, ["missing"])
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def test_custom_default_still_distinguishes_missing_from_none(self):
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cache = Cache()
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marker = object()
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self.assertIs(cache.get("unknown", marker), marker)
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cache.put("known-none", None)
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self.assertIsNone(cache.get("known-none", marker))
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def test_falsey_values_are_cached(self):
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cache = Cache()
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calls = []
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def loader(key):
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calls.append(key)
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return 0
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self.assertEqual(cache.get_or_load("zero", loader), 0)
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self.assertEqual(cache.get_or_load("zero", loader), 0)
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self.assertEqual(calls, ["zero"])
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if __name__ == "__main__":
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unittest.main()
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