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##############################################################################
# Copyright (c) 2013-2017, Lawrence Livermore National Security, LLC.
# Produced at the Lawrence Livermore National Laboratory.
#
# This file is part of Spack.
# Created by Todd Gamblin, tgamblin@llnl.gov, All rights reserved.
# LLNL-CODE-647188
#
# For details, see https://github.com/spack/spack
# Please also see the NOTICE and LICENSE files for our notice and the LGPL.
#
# This program 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) version 2.1, February 1999.
#
# This program 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 terms and
# conditions of the GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
##############################################################################
import pytest
import spack.util.pattern as pattern
@pytest.fixture()
def interface():
"""Returns the interface class for the composite."""
class Base:
counter = 0
def add(self):
raise NotImplemented('add not implemented')
def subtract(self):
raise NotImplemented('subtract not implemented')
return Base
@pytest.fixture()
def implementation(interface):
"""Returns an implementation of the interface"""
class Implementation(interface):
def __init__(self, value):
self.value = value
def add(self):
interface.counter += self.value
def subtract(self):
interface.counter -= self.value
return Implementation
@pytest.fixture(params=[
'interface',
'method_list'
])
def composite(interface, implementation, request):
"""Returns a composite that contains an instance of `implementation(1)`
and one of `implementation(2)`.
"""
if request.param == 'interface':
@pattern.composite(interface=interface)
class Composite:
pass
else:
@pattern.composite(method_list=['add', 'subtract'])
class Composite:
pass
c = Composite()
c.append(implementation(1))
c.append(implementation(2))
return c
def test_composite_interface_calls(interface, composite):
composite.add()
assert interface.counter == 3
composite.pop()
composite.subtract()
assert interface.counter == 2
def test_composite_wrong_container(interface):
with pytest.raises(TypeError):
@pattern.composite(interface=interface, container=2)
class CompositeFromInterface:
pass
def test_composite_no_methods():
with pytest.raises(TypeError):
@pattern.composite()
class CompositeFromInterface:
pass
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