[Zope3-checkins] CVS: Packages3/Interface/tests - test_ExtentionClass.py:1.1

[Jim Fulton]

Update of /cvs-repository/Packages3/Interface/tests
In directory cvs.zope.org:/tmp/cvs-serv21701/src/Interface/tests

Added Files:
	test_ExtentionClass.py 
Log Message:
Changed the way providedBy worked to fix a bug in handling old-style
extension classes.

Note that the test is actually in Packages3/Interfaces, the facade
that emulated Z2 interfaces using Z3 interfaces. It was easier
to write the test there, because I could actually write it using
extension class. :) My attempts at simulating EC failed and are too
hard to understand, at least today.


=== Added File Packages3/Interface/tests/test_ExtentionClass.py ===
##############################################################################
#
# Copyright (c) 2003 Zope Corporation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.0 (ZPL).  A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
"""Tests to make sure the interface facade works with old-style ExtensionClass

$Id: test_ExtentionClass.py,v 1.1 2004/01/21 21:58:47 jim Exp $
"""
import unittest
import Interface.Implements

try:
    from ExtensionClass import Base
except ImportError:
    print 'Old-style ExtensionClass is not installed. Skipping tests'
    Base = object


def test_classic_declarations_work_in_subclass_that_is_ExtensionClass():
    """

    >>> class I1(Interface.Interface):
    ...     pass

    >>> class C:
    ...     __implements__ = I1

    >>> I1.isImplementedBy(C())
    True
    
    >>> chicken = []

    >>> ifaces = []
    >>> Interface.Implements.visitImplements(C.__implements__, chicken,
    ...                                      ifaces.append)
    >>> [iface.__name__ for iface in ifaces]
    ['I1']

    >>> class I2(Interface.Interface):
    ...     pass

    >>> class E(Base, C):
    ...     __implements__ = I2

    >>> I2.isImplementedBy(E())
    True
    
    >>> ifaces = []
    >>> Interface.Implements.visitImplements(E.__implements__, chicken,
    ...                                      ifaces.append)
    >>> [iface.__name__ for iface in ifaces]
    ['I2']

    >>> I2.isImplementedBy(E())
    True
    
    
    """






if issubclass(Base, object):
    # Skip tests
    def test_suite():
        return unittest.TestSuite()
else:
    from doctest import DocTestSuite
    def test_suite():
        return unittest.TestSuite((
            DocTestSuite(),
            ))
    

if __name__ == '__main__': unittest.main()