@Test
public void testFixedLengthString(){

	int length = 12;
	String str = "12";
	String rs = LangUtils.fixedLengthString(str, length, "0");
	Assert.assertEquals("000000000012", rs);
	str = "10000000000000012";
	rs = LangUtils.fixedLengthString(str, length, "0");
	Assert.assertEquals("000000000012", rs);
	str = null;
	rs = LangUtils.fixedLengthString(str, length, "0");
	Assert.assertEquals("000000000000", rs);
}