Junit4测试

package cn.edu.xaut.junit;
import cn.edu.xaut.exception.*;
public class Equation {
    private static float x1;
    private static float x2;
    private static float x;
    private static float real;
    private static float imag;
    private static float[] results;

    private static float a;
    private static float b;
    private static float c;

    private static float delt;
     public static float[] calc(float w,float p,float q)throws Exception{
         results=new float[2];
         a=w; b=p; c=q;
         if(0.0f==a){ //bx+c=0; x=-c/b;

                 if(0.0f!=b){
                    x=-c/b;
                    results[0]=x;
                    print();
                 return results;
                 }
                 else{
                     throw new MyArithmeticException("除数不能为0");
                 }

         }else{
             delt=b*b-4*a*c;
             if(delt>=0){
                x1=(float) ((-b+Math.sqrt(delt))/(2*a));
                x2=(float) ((-b-Math.sqrt(delt))/(2*a));
                results[0]=x1;
                results[1]=x2;
                print();
                return results;

             }else{
                 real=-b/(2*a);
                 imag=(float) (Math.sqrt(-delt)/(2*a));
                 results[0]=real;
                 results[1]=imag;
                 print();
                    return results;
             }
         }
     }

    public static void print(){
         if(0.0f==a){
             if(0.0f!=b){
                 System.out.println("该方程是一元一次方程，其根为：x="+results[0]);
             }else{
                 System.err.println("不是一个方程！");
             }
         }else{
             if(delt>=0){
                 System.out.println("该方程是一元二次方程，两根分别为：x1="+results[0]+",x2="+results[1]);
             }else{
                 System.out.println("该一元二次方程的根为复数,两根分别为:x1="+results[0]+"+"+results[1]+"i"+",x2="+results[0]+"-"+results[1]+"i");
             }
         }
     }
}

package cn.edu.xaut.exception;

public class MyArithmeticException extends Exception {

    public MyArithmeticException() {
    }

    public MyArithmeticException(String message) {
        super(message);
    }

    public MyArithmeticException(Throwable cause) {
        super(cause);
    }

    public MyArithmeticException(String message, Throwable cause) {
        super(message, cause);
    }
}

package test;
import org.junit.Assert;
import org.junit.Test;
import cn.edu.xaut.junit.Equation;

public class EquationTest {
    @Test
    public void testCalc() {
        float a = 1.0f;
        float b = 2.0f;
        float c = 1.0f;
        float[] expecteds = {-1.0f,-1.0f };
        //float[] expecteds = {-0.5f,0.5f};

         //float expecteds =-0.5f;

         float[] results;
        try {
            results = Equation.calc(a, b, c);
            Assert.assertArrayEquals(expecteds, results, 0.0f);
             //Assert.assertEquals(expecteds,results[0],0.0f);

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

优秀的代码是调试出来的，这个代码设计是参考Math.sqrt() 

欢迎大家拍砖！

附上源码：

 软件测试实验.rar