@Test
public void testContainsAll() {

    CodePoints codePoints = new CodePoints("あ", "い", "う");
    assertThat(codePoints.containsAll("あ"), is(true));
    assertThat(codePoints.containsAll("い"), is(true));
    assertThat(codePoints.containsAll("う"), is(true));
    assertThat(codePoints.containsAll("あい"), is(true));
    assertThat(codePoints.containsAll("いう"), is(true));
    assertThat(codePoints.containsAll("うあ"), is(true));
    assertThat(codePoints.containsAll("あいう"), is(true));
    assertThat(codePoints.containsAll("あいうえ"), is(false));
}