@Override
    public String toString() {
        return toString;
    }
@Test
    void assertToString() {
        assertThat(new Grantee("name", "127.0.0.1").toString(), is("name@127.0.0.1"));
        assertThat(new Grantee("name", "%").toString(), is("name@%"));
        assertThat(new Grantee("name", "").toString(), is("name@%"));
    }