'Make sure things are initialized.'

def setUp(self):

    super(ArtifactFlowLinuxTest, self).setUp()
    with aff4.FACTORY.Open(self.SetupClients(1, system='Linux', os_version='12.04')[0], mode='rw', token=self.token) as fd:
        kb = fd.Get(fd.Schema.KNOWLEDGE_BASE)
        kb.MergeOrAddUser(rdf_client.User(username='gogol'))
        kb.MergeOrAddUser(rdf_client.User(username='gevulot'))
        kb.MergeOrAddUser(rdf_client.User(username='exomemory'))
        fd.Set(kb)
    self.LoadTestArtifacts()
