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# unit tests for the cache module
from logilab.common.testlib import TestCase, unittest_main
from logilab.common.cache import Cache
class CacheTestCase(TestCase):
def setUp(self):
self.cache = Cache(5)
def test_setitem1(self):
"""Checks that the setitem method works"""
self.cache[1] = 'foo'
self.assert_(self.cache.data[1] == 'foo',"1 : 'foo' is not in cache.data")
self.assert_(len(self.cache._usage) == 1, "lenght of usage list is not 1")
self.assert_(self.cache._usage[-1] == 1, '1 is not the most recently used key')
self.assert_(self.cache._usage.sort() == self.cache.data.keys().sort(), "usage list and data keys are different")
def test_setitem2(self):
"""Checks that the setitem method works for multiple items"""
self.cache[1] = 'foo'
self.cache[2] = 'bar'
self.assert_(self.cache.data[2] == 'bar',"2 : 'bar' is not in cache.data")
self.assert_(len(self.cache._usage) == 2, "lenght of usage list is not 2")
self.assert_(self.cache._usage[-1] == 2, '1 is not the most recently used key')
self.assert_(self.cache._usage.sort() == self.cache.data.keys().sort(), "usage list and data keys are different")
def test_setitem3(self):
"""Checks that the setitem method works when replacing an element in the cache"""
self.cache[1] = 'foo'
self.cache[1] = 'bar'
self.assert_(self.cache.data[1] == 'bar',"1 : 'bar' is not in cache.data")
self.assert_(len(self.cache._usage) == 1, "lenght of usage list is not 1")
self.assert_(self.cache._usage[-1] == 1, '1 is not the most recently used key')
self.assert_(self.cache._usage.sort() == self.cache.data.keys().sort(), "usage list and data keys are different")
def test_recycling1(self):
"""Checks the removal of old elements"""
self.cache[1] = 'foo'
self.cache[2] = 'bar'
self.cache[3] = 'baz'
self.cache[4] = 'foz'
self.cache[5] = 'fuz'
self.cache[6] = 'spam'
self.assert_(not self.cache.data.has_key(1), 'key 1 has not been suppressed from the cache dictionnary')
self.assert_(1 not in self.cache._usage, 'key 1 has not been suppressed from the cache LRU list')
self.assert_(len(self.cache._usage) == 5, "lenght of usage list is not 5")
self.assert_(self.cache._usage[-1] == 6, '6 is not the most recently used key')
self.assert_(self.cache._usage.sort() == self.cache.data.keys().sort(), "usage list and data keys are different")
def test_recycling2(self):
"""Checks that accessed elements get in the front of the list"""
self.cache[1] = 'foo'
self.cache[2] = 'bar'
self.cache[3] = 'baz'
self.cache[4] = 'foz'
a = self.cache[1]
self.assert_(a == 'foo')
self.assert_(self.cache._usage[-1] == 1, '1 is not the most recently used key')
self.assert_(self.cache._usage.sort() == self.cache.data.keys().sort(), "usage list and data keys are different")
def test_delitem(self):
"""Checks that elements are removed from both element dict and element
list.
"""
self.cache['foo'] = 'bar'
del self.cache['foo']
self.assert_('foo' not in self.cache.data.keys(),"Element 'foo' was not removed cache dictionnary")
self.assert_('foo' not in self.cache._usage,"Element 'foo' was not removed usage list")
self.assert_(self.cache._usage.sort() == self.cache.data.keys().sort(), "usage list and data keys are different")
def test_nullsize(self):
"""Checks that a 'NULL' size cache doesn't store anything
"""
null_cache = Cache(0)
null_cache['foo'] = 'bar'
self.assert_(null_cache.size == 0, 'Cache size should be O, not %d' % \
null_cache.size)
self.assert_(len(null_cache) == 0, 'Cache should be empty !')
# Assert null_cache['foo'] raises a KeyError
self.assertRaises(KeyError, null_cache.__getitem__, 'foo')
# Deleting element should not raise error
del null_cache['foo']
if __name__ == "__main__":
unittest_main()
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