zope.interface.tests.test

Package zope :: Package interface :: Package tests :: Module test_interface

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Module zope.interface.tests.test_interface

Test Interface implementation

$Id: test_interface.py,v 1.2 2005/06/24 16:52:47 nyergler Exp $

Classes
`_I1`
`_I1_`
`_I1__`
`_I2`
`InterfaceTests`

Function Summary
	`main()`
	`test_invariant_as_decorator()` Invaiants can be deined in line
	`test_suite()`

Function Details

test_invariant_as_decorator()

Invaiants can be deined in line

>>> class IRange(interface.Interface):
...     min = interface.Attribute("Lower bound")
...     max = interface.Attribute("Upper bound")
...
...     &#64;interface.invariant
...     def range_invariant(ob):
...         if ob.max < ob.min:
...             raise Invalid('max < min')

>>> class Range(object):
...     interface.implements(IRange)
...
...     def __init__(self, min, max):
...         self.min, self.max = min, max

>>> IRange.validateInvariants(Range(1,2))
>>> IRange.validateInvariants(Range(1,1))
>>> IRange.validateInvariants(Range(2,1))
Traceback (most recent call last):

...

Invalid: max < min

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