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# Copyright 2019 PrivateStorage.io, LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
Testtools matchers useful for the test suite.
"""
import attr
from testtools.matchers import (
Mismatch,
)
@attr.s
class Provides(object):
"""
Match objects that provide one or more Zope Interface interfaces.
"""
interfaces = attr.ib()
def match(self, obj):
missing = set()
for iface in self.interfaces:
if not iface.providedBy(obj):
missing.add(iface)
if missing:
return Mismatch("{} does not provide expected {}".format(
obj, ", ".join(str(iface) for iface in missing),
))