@Test
public void testEquality1() {

    SafeIterableMap<Integer, Integer> map1 = from(1, 2, 3, 4).to(10, 20, 30, 40);
    SafeIterableMap<Integer, Integer> map2 = from(1, 2, 3, 4).to(10, 20, 30, 40);
    assertThat(map1.equals(map2), is(true));
}