作业8 单元测试练习

public class Triangle {
    // 定义三角形的三边
    
    protected long lborderA = 0;

    protected long lborderB = 0;

    protected long lborderC = 0;

    // 构造函数
    public Triangle(long lborderA, long lborderB, long lborderC) {

    this.lborderA = lborderA;

    this.lborderB = lborderB;

    this.lborderC = lborderC;

    }

    /**
      * 判断是否是三角形
      * 
      * 是返回true；不是返回false
     */
    public boolean isTriangle(Triangle triangle) {
       boolean isTriangle = false;

       // 判断边界，大于0 小于或等于Long.MAX_VALUE，出界返回false
       if ((triangle.lborderA > 0 && triangle.lborderA <= Long.MAX_VALUE)
            && (triangle.lborderB > 0 && triangle.lborderB <= Long.MAX_VALUE)
            && (triangle.lborderC > 0 && triangle.lborderC <= Long.MAX_VALUE)) {

        // 判断两边之差小于第三边
        if (diffOfBorders(triangle.lborderA, triangle.lborderB) < triangle.lborderC
                && diffOfBorders(triangle.lborderB, triangle.lborderC) < triangle.lborderA
                && diffOfBorders(triangle.lborderC, triangle.lborderA) < triangle.lborderB) {
            isTriangle = true;
          }

        }
        return isTriangle;
    }

    /**
     * 判断三角形类型
     * 
     * 只有两条边相等的三角形返回字符串“等腰三角形”； 三边均相等的三角形返回字符串“等边三角形”； 三边均不等的三角形返回字符串“不等边三角形”；
     */
    public String getType(Triangle triangle) {
        String strType = "Illegal";

       // 判断是否是三角形
       if (isTriangle(triangle)) {
          // 判断是否是等边三角形
          if (triangle.lborderA == triangle.lborderB
                && triangle.lborderB == triangle.lborderC) {
               strType = "Regular";
           }
          // 判断是否是不等边三角形
          else if ((triangle.lborderA != triangle.lborderB)
                && (triangle.lborderB != triangle.lborderC)
                && (triangle.lborderA != triangle.lborderC)) {
                strType = "Scalene";
          }
          // 三角形既非三边全部相等，又非全部不等，只能是部分相等即等腰三角形
          else {
               strType = "Isoceles";
              }
        }

       return strType;
    }

    /**
       * 计算两边之差的绝对值
      * 
     * */
    public long diffOfBorders(long a, long b) {
        return (a > b) ? (a - b) : (b - a);
    }
@Test
        public void testIsTriangle1(){
            Triangle t = new Triangle(1,1,1);
            assertFalse(t.isTriangle(t));
        }
    
        @Test
        public void testIsTriangle2(){
            // according to the mutant, this test case should fail
            Triangle t = new Triangle(3,4,5);
            assertFalse(t.isTriangle(t));
        }
    
        @Test
        public void testIsTriangle3(){
            Triangle t = new Triangle(2,2,1);
            assertFalse(t.isTriangle(t));
        }
 @Test
        public void testIsTriangle4(){
            Triangle t = new Triangle(3,3,6);
            assertFalse(t.isTriangle(t));
        }
 @Test
        public void testIsTriangle5(){
            Triangle t = new Triangle(3,-3,6);
            assertFalse(t.isTriangle(t));
        }
 @Test
        public void testIsTriangle6(){
            Triangle t = new Triangle(-3,3,6);
            assertFalse(t.isTriangle(t));
        }
    /**
    * 用于获取三角形的边长
    */
    public long[] getBorders() {
        long[] borders = new long[3];
        borders[0] = this.lborderA;
        borders[1] = this.lborderB;
        borders[2] = this.lborderC;
        return borders;
    }