public static boolean equalsIgnoreCase(String a, String b) {
        if (a == null) {
            return b == null;
        }
        return a.equalsIgnoreCase(b);
    }
@Test
    public void testEqualsIgnoreCase() {
        Assert.assertFalse(StringUtils.equalsIgnoreCase(null, ""));
        Assert.assertFalse(StringUtils.equalsIgnoreCase("foo", "bar"));

        Assert.assertTrue(StringUtils.equalsIgnoreCase(null, null));
        Assert.assertTrue(StringUtils.equalsIgnoreCase("foo", "foo"));
        Assert.assertTrue(StringUtils.equalsIgnoreCase("foo", "FOO"));
    }