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#
# Copyright Applied Language Solutions 2012
#
# This file is part of Pypeline.
#
# Pypeline is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Pypeline is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with Pypeline. If not, see <http://www.gnu.org/licenses/>.
#
import unittest
from pypeline.core.types.nothing import Nothing, return_
class NothingMonadUnitTest(unittest.TestCase):
def test_bind(self):
value = 9
f = lambda a: a * 10
j = return_(value)
monad = j >= (lambda a: Just(f(a)))
self.assertEquals(Nothing(), monad)
def test_zero(self):
self.assertFalse(Nothing("nowt"))
def test_eq(self):
self.assertTrue(Nothing() == return_("blah"))
self.assertFalse(Nothing() == None)
self.assertFalse(Nothing() == object())
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