Java如何对类进行单元测试（unit test）-蒲公英云

Java如何对类进行单元测试（unit test）

Java对类进行单元测试

每一个类可以有一 main 方法。这是一个常用于对类单元测试（unit test）的方法。例如，可以在Employee类中添加一个main方法：

class Employee { 
    public Employee(String n, double s, int year, int month, int day){ 
        name = n;
        salary = s;
        LocalDAte hireDay = LocalDate.now(year, month, day);
    }
    ······(省略)
    public static void main(String[] args) { 
        Employee e = new Employee("Herry", 5000, 2003, 3, 21);
        System.out.println(e.getName() + " " + e.getSalary());
    }
}

如果想要独立地测试Employee类，只需要执行

java Employee

如果Employee类只是一个更大型的应用程序的一部分，就可以使用下面这条语句运行程序

java Application
java Application

Employee类的main方法永远不会执行。

完整程序：

package Employee;
 import java.time.LocalDate;
 /** * 《 Java核心技术 卷I 》P104：程序清单4-2 * EmployeeTest/EmployeeTest.java * @author Gordo_li * */
 public class EmployeeTest { 
     public static void main(String[] args) { 
         // TODO Auto-generated method stub
         Employee[] staff = new Employee[3];
         staff[0] = new Employee("Carl", 75000, 1987, 12, 15);
         staff[1] = new Employee("Harry", 50000, 1989, 10, 1);
         staff[2] = new Employee("Tony", 40000, 1990, 3,15);
         for (Employee e: staff)
             e.raiseSalary(5);
         for (Employee e: staff)
             System.out.println("name = " + e.getName() 
             + ", salary = " + e.getSalary() 
             + ", hireDay = " + e.getHireDay());
     }
 }
 class Employee 
 { 
     private String  name;
     private double salary;
     private LocalDate hireDay;
     public Employee(String n, double s, int year, int month, int day){ 
         name = n;
         salary = s;
         LocalDate hrieDay = LocalDate.of(year, month, day);
     }
     public String getName(){ 
         return name;
     }
     public double getSalary(){ 
         return salary;
     }
     public LocalDate getHireDay() { 
         return hireDay;
     }
     public void raiseSalary(double byPercent) { 
         double raise = salary * byPercent / 100;
         salary += raise;
     }
 }