@Test
public void subSequence() throws Exception {

    CharSequence orig = "abcdef";
    CharSequence reved = "fedcba";
    ReversedCharSequence test = (ReversedCharSequence) ReversedCharSequence.of(orig);
    int iMax = orig.length();
    for (int i = 0; i < iMax; i++) {
        for (int j = iMax - i - 1; j >= 0 && j >= i; j--) {
            assertEquals("subSequence(" + i + "," + j + ")", reved.subSequence(i, j), test.subSequence(i, j).toString());
            assertEquals("reverse.of(subSequence(" + i + "," + j + "))", orig.subSequence(test.mapIndex(j) + 1, test.mapIndex(j) + 1 + j - i), ReversedCharSequence.of(test.subSequence(i, j)).toString());
            assertEquals("subSequence(" + i + "," + j + ").hashCode()", reved.subSequence(i, j).hashCode(), test.subSequence(i, j).hashCode());
            assertEquals("subSequence(" + i + "," + j + ").equals()", true, test.subSequence(i, j).equals(reved.subSequence(i, j)));
        }
    }
}