// @Test
// for performance test
public void testAddLongPerformance() {
String big = Long.MAX_VALUE + "";
long t1 = System.currentTimeMillis();
for (long i = 0; i < Long.MAX_VALUE; i++) {
big = StringUtils.addLong(big, i);
}
long t2 = System.currentTimeMillis();
System.out.println("spend" + (t2 - t1) + "ms");
}
@Test
public void testAddLong() {
String r = StringUtils.addLong("99999", 1);
assertEquals(r, "100000");
}