@Override
    public boolean equals(Object other) {
        if (!(other instanceof Tenant)) {
            return false;
        }
        Tenant that = (Tenant) other;
        return name.equals(that.name);
    }
@Test
    public void equals() {
        assertEquals(t1, t2);
        assertNotEquals(t1, t3);
        assertNotEquals(t1, t4);
        assertNotEquals(t3, t4);
    }