'Populated Relationships instance that will exercise the rels.xml
property.'

@pytest.fixture
def rels(self):

    rels = Relationships(u'/baseURI')
    rels.add_relationship(reltype=u'http://rt-hyperlink', target=u'http://some/link', rId=u'rId1', is_external=True)
    part = Mock(name=u'part')
    part.partname.relative_ref.return_value = u'../media/image1.png'
    rels.add_relationship(reltype=u'http://rt-image', target=part, rId=u'rId2')
    return rels
