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from twisted.trial.unittest import TestCase
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from epsilon.remember import remembered
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from epsilon.structlike import record
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class Rememberee(record("rememberer whichValue")):
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A sample value that holds on to its L{Rememberer}.
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class Rememberer(object):
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Sample application code which uses epsilon.remember.
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@ivar invocations: The number of times that it is invoked.
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return Rememberee(self, 1)
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self.otherInvocations += 1
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return Rememberee(self, 2)
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class RememberedTests(TestCase):
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The "remembered" decorator allows you to lazily create an attribute and
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Create a L{Rememberer} for use with the tests.
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self.rememberer = Rememberer()
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def test_selfArgument(self):
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The "self" argument to the decorated creation function will be the
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instance the property is accessed upon.
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value = self.rememberer.value1
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self.assertIdentical(value.rememberer, self.rememberer)
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def test_onlyOneInvocation(self):
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The callable wrapped by C{@remembered} will only be invoked once,
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regardless of how many times the attribute is accessed.
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self.assertEquals(self.rememberer.invocations, 0)
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firstTime = self.rememberer.value1
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self.assertEquals(self.rememberer.invocations, 1)
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secondTime = self.rememberer.value1
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self.assertEquals(self.rememberer.invocations, 1)
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self.assertIdentical(firstTime, secondTime)
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def test_twoValues(self):
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If the L{@remembered} decorator is used more than once, each one will
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be an attribute with its own identity.
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self.assertEquals(self.rememberer.invocations, 0)
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self.assertEquals(self.rememberer.otherInvocations, 0)
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firstValue1 = self.rememberer.value1
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self.assertEquals(self.rememberer.invocations, 1)
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self.assertEquals(self.rememberer.otherInvocations, 0)
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firstValue2 = self.rememberer.value2
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self.assertEquals(self.rememberer.otherInvocations, 1)
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self.assertNotIdentical(firstValue1, firstValue2)
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secondValue2 = self.rememberer.value2
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self.assertIdentical(firstValue2, secondValue2)
added
removed
Epsilon/epsilon/test/test_remember.py
