@Test
void testCreateFromKeysWithValueSupplier() {

    ImmutableList<Integer> keys = ImmutableList.of(1, 2, 3, 4);
    ImmutableMap<Integer, Integer> expected = ImmutableMap.of(
            1, 1,
            2, 1,
            3, 1,
            4, 1);
    ImmutableMap<Integer, Integer> actual = ImmutableMapFactory.createFromKeys(keys, () -> 1);
    Assertions.assertEquals(expected, actual);
}