def METHOD_NAME(self):
    update = ["move dev-util/foo dev-util/foo"]
    pkgs = ("dev-util/foo-0",)
    updates = {"1Q-2020": update}
    r = self.assertReport(self.mk_check(pkgs=pkgs, **updates), [])
    assert isinstance(r, repo_metadata.RedundantPackageUpdate)
    assert r.updates == ("move", "dev-util/foo", "dev-util/foo")
    assert "update line moves to the same package/slot" in str(r)