package ex;

import junit.framework.TestCase;
import org.junit.Test;

public class StringBufferDemoTest extends TestCase {
    StringBuffer a = new StringBuffer("I love java"); // 测试11个字符(<=16)
    StringBuffer b = new StringBuffer("I love java I love java");//测试23个字符 (>16 && <= 34)
    StringBuffer c = new StringBuffer("I love java I love java I love java");//测试35个字符(>34)
    @Test
    public void testcharAt() {
        assertEquals('I', a.charAt(0));
        assertEquals('e', a.charAt(5));
        assertEquals('a', a.charAt(10));
    }
    @Test
    public void testcapacity() {
        assertEquals(27, a.capacity());
        assertEquals(39, b.capacity());
        assertEquals(51, c.capacity());
    }
    @Test
    public void testlength() {
        assertEquals(11, a.length());
        assertEquals(23, b.length());
        assertEquals(35, c.length());
    }
    @Test
    public void testindexOf() {
        assertEquals(0, a.indexOf("I l"));
        assertEquals(5, a.indexOf("e j"));
        assertEquals(9, a.indexOf("va"));
    }
}