public static String addSuffixIfNot(CharSequence str, CharSequence suffix) {
		return appendIfMissing(str, suffix, suffix);
	}
@Test
	public void addSuffixIfNotTest() {
		String str = "hutool";
		String result = CharSequenceUtil.addSuffixIfNot(str, "tool");
		assertEquals(str, result);

		result = CharSequenceUtil.addSuffixIfNot(str, " is Good");
		assertEquals(str + " is Good", result);

		// https://gitee.com/dromara/hutool/issues/I4NS0F
		result = CharSequenceUtil.addSuffixIfNot("", "/");
		assertEquals("/", result);
	}