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import unittest
from gaphas.state import reversible_pair, observed, _reverse
class SList(object):
def __init__(self):
self.l = list()
def add(self, node, before=None):
if before: self.l.insert(self.l.index(before), node)
else: self.l.append(node)
add = observed(add)
@observed
def remove(self, node):
self.l.remove(self.l.index(node))
class StateTestCase(unittest.TestCase):
def test_adding_pair(self):
"""Test adding reversible pair
"""
reversible_pair(SList.add, SList.remove, \
bind1={'before': lambda self, node: self.l[self.l.index(node)+1] })
self.assertTrue(SList.add.im_func in _reverse)
self.assertTrue(SList.remove.im_func in _reverse)
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