Skip to content
Snippets Groups Projects
matchers.py 1.16 KiB
Newer Older
  • Learn to ignore specific revisions
  • # 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),
                ))