'Tests that two nodes that should have a precedes relationship have it.'

def test_precedes_relationship(self):

    (__, relationships) = serialize_course(self.course.id)
    self.assertBlockPairIsRelationship(self.video, self.video2, relationships, u'PRECEDES')
    self.assertBlockPairIsNotRelationship(self.video2, self.video, relationships, u'PRECEDES')
    self.assertBlockPairIsNotRelationship(self.vertical, self.video, relationships, u'PRECEDES')
    self.assertBlockPairIsNotRelationship(self.html, self.video, relationships, u'PRECEDES')
