@Test
public void testToString() {

	StringBundler sb = new StringBundler();
	sb.append("test1");
	sb.append("test2");
	sb.append("test3");
	Assert.assertEquals("test1test2test3", sb.toString());
	// StringBuilder
	sb.append("test4");
	Assert.assertEquals("test1test2test3test4", sb.toString());
}