Arrays和String单元测试 20175301

要求

在IDEA中以TDD的方式对String类和Arrays类进行学习

一、String类相关方法的单元测试

1.ChatAt的测试

代码：

import org.junit.Test;
import junit.framework.TestCase;
public class Char extends TestCase{
    String s = new String("aaaazdxzds");
    @Test
    public void testcharAt() throws Exception {
        assertEquals('a',s.charAt(0));//正常
        assertEquals('下', new String("天下").charAt(1));//一个汉字占两个字节一个字符
        assertEquals('e', new String("abcd e").charAt(5));//正常
        assertEquals(' ', new String("abcd e").charAt(4));//边界
        //assertEquals(' ', new String("abcd e").charAt(6));//error
        //assertEquals('下', new String("天下").charAt(1));//error
    }

}

结果截图：

一共测试了四种通过情况，两种错误情况。

2. split方法测试

测试代码（包括整个String类）

import org.junit.Assert;
import org.junit.Test;
import junit.framework.TestCase;
public class CharTest {
    String s = new String("aaaazdxzds");
    String s1= new String("my guiding-moon-light");
    @Test
    public void testcharAt() throws Exception {
        Assert.assertEquals('a', s.charAt(0));//正常
        Assert.assertEquals('下', new String("天下").charAt(1));//一个汉字占两个字节一个字符
        Assert.assertEquals('e', new String("abcd e").charAt(5));//正常
        Assert.assertEquals(' ', new String("abcd e").charAt(4));//边界
        //assertEquals(' ', new String("abcd e").charAt(6));//error
        //assertEquals('下', new String("天下").charAt(1));//error
    }

    @Test
    public void TestCase() throws Exception{
        Assert.assertEquals("my", s1.split(" ")[0]);//正常情况
        Assert.assertEquals("", s1.split("[a-z]+")[0]);//边界情况
        Assert.assertEquals("guiding-moon-light", s1.split(" ")[1]);//边界情况
        //assertEquals(" ",s1.split(" ")[-1]);//error
        //assertEquals(" ",s1.split(" ")[100]);//error
    }
}

测试了两种正常情况两种异常情况一个超出界限，一个小于0

实验截图:

一、Arrays类相关方法的单元测试

1，sort方法

代码：

import static org.junit.Assert.*;
import org.junit.Assert;
import org.junit.Test;
import junit.framework.TestCase;
import java.util.Arrays;

public class ArraysTest extends TestCase {
    String[] s = {"w", "d", "n", "m", "d"};
    int[] i = {2, 1, 4, 5, 3};
    char[] p = {'a', 'b', 'c'};

    @Test
    public void testSort() {
        Arrays.sort(i);
        assertEquals(1, i[0]);
        assertEquals(2, i[1]);
        assertEquals(3, i[2]);
        assertEquals(4, i[3]);
        assertEquals(5, i[4]);
        //assertEquals(5,i[3]); //
        Arrays.sort(p);
        assertEquals("[a, b, c]",Arrays.toString(p));
        Arrays.sort(s);
        assertEquals("[d, d, m, n, w]",Arrays.toString(s));

    }
}

2，binarySearch方法

代码：

import static org.junit.Assert.*;
import org.junit.Assert;
import org.junit.Test;
import junit.framework.TestCase;
import java.util.Arrays;
import static java.util.Arrays.binarySearch;

public class ArraysTest extends TestCase {
    String[] s = {"w", "d", "n", "m", "d"};
    int[] i = {2, 1, 4, 5, 3};
    char[] p = {'a', 'b', 'c'};

    @Test
    public void testSort() {
        Arrays.sort(i);
        assertEquals(1, i[0]);
        assertEquals(2, i[1]);
        assertEquals(3, i[2]);
        assertEquals(4, i[3]);
        assertEquals(5, i[4]);
        //assertEquals(5,i[3]); //
        Arrays.sort(p);
        assertEquals("[a, b, c]",Arrays.toString(p));
        Arrays.sort(s);
        assertEquals("[d, d, m, n, w]",Arrays.toString(s));
    }
    public void testBinarySearch(){
        Arrays.sort(i);
        assertEquals(0 ,Arrays.binarySearch(i,1));//正常情况
        //assertEquals(-6,Arrays.binarySearch(i,100));//error
        //assertEquals(-1,Arrays.binarySearch(i,-1));//error
    }
}