测试驱动开发 java基础

public class CourseSessionTest extends junit.framework.TestCase
{
	public void testCreate(){
		CourseSession session = new CourseSession("ENGL","101");
		Student student1 = new Student("mixian");
		Student student2 = new Student("longquan");
		session.enroll(student1);
		session.enroll(student2);
		java.util.ArrayList<Student> studentList =session.getAllStudentList();
		assertEquals(student1,studentList.get(0));
		assertEquals(student2,studentList.get(1));
		assertEquals(2,studentList.size());
	
		assertEquals("ENGL",session.getName());
		assertEquals("101",session.getNumber());
		assertEquals(2,session.getNumberofstudent());

		CourseSession session2 = new CourseSession("CHIN","102");
		assertEquals("CHIN",session2.getName());
		assertEquals("102",session2.getNumber());
		//assertEquals(2,session2.getNumberofstudent());
	}	
}

 前面已经介绍了基本的测试方法，继续java基础的介绍

有学生类以后还要有课程类，用来记录课程名称、编号、学生人数、学分等

public class CourseSessionTest extends junit.framework.TestCase
{
	public void testCreate(){
		CourseSession session = new CourseSession("ENGL","101");

		assertEquals("ENGL",session.getName());
		assertEquals("101",session.getNumber());
		assertEquals(0,session.getNumberofstudent());

		CourseSession session2 = new CourseSession("CHIN","102");
		assertEquals("CHIN",session2.getName());
		assertEquals("102",session2.getNumber());
		assertEquals(1,session2.getNumberofstudent());
	}	
}

 

class CourseSession{
	private String name;
	private String number;
	private int studentnumber=0;

	CourseSession(String name,String number){
		this.name=name;
		this.number = number;
	}

	public void enroll(Student student){
		studentnumber++;
	}
	
	public void setName(String name){
		this.name = name;
	}
	public void setNumber(String number){
		this.number = number;
	}
	public String getName(){
		return this.name;
	}
	public String getNumber(){
		return this.number;
	}

	public int getNumberofstudent(){
		return studentnumber;
	}

}

 这样需要引入Student这个类

然后更改测试CourseSessionTest类

public class CourseSessionTest extends junit.framework.TestCase
{
	public void testCreate(){
		CourseSession session = new CourseSession("ENGL","101");
		Student student1 = new Student("mixian");
		Student student2 = new Student("longquan");
		session.enroll(student1);
		session.enroll(student2);
		assertEquals("ENGL",session.getName());
		assertEquals("101",session.getNumber());
		assertEquals(2,session.getNumberofstudent());

		CourseSession session2 = new CourseSession("CHIN","102");
		assertEquals("CHIN",session2.getName());
		assertEquals("102",session2.getNumber());
//		assertEquals(1,session2.getNumberofstudent());
	}	
}

 

class CourseSession{
	private String name;
	private String number;
	private int studentnumber=0;

	CourseSession(String name,String number){
		this.name=name;
		this.number = number;
	}

	public void enroll(Student student){
		studentnumber++;
	}
	
	public void setName(String name){
		this.name = name;
	}
	public void setNumber(String number){
		this.number = number;
	}
	public String getName(){
		return this.name;
	}
	public String getNumber(){
		return this.number;
	}

	public int getNumberofstudent(){
		return studentnumber;
	}

}

 

 明显是由于在类中没有引入Student类。修改一下就好了

 现在系统中有2个测试用例 一个是StudentTest.java 和CourseSessionTest.java

为了确保测试都可以同时运行成功，所以要用到测试组件，将2个TEST全部加入到测试组件中一起运行。

 

public class AllTest{
	public static junit.framework.TestSuite suite = new 

junit.framework.TestSuite();
	suite.add(StudentTest.class);
	suite.add(CourseSessionTest.class);
	reaturn suite;
}

 

创建套件并返回，有junit.frameword.TestSuite来管理套件

suite必须是static静态的

稳定版本：

class CourseSession{
	private String name;
	private String number;
	private int studentnumber=0;
	private java.util.ArrayList<Student> studentList = new 

java.util.ArrayList<Student>();

	CourseSession(String name,String number){
		this.name=name;
		this.number = number;
	}

	public java.util.ArrayList<Student> getAllStudentList(){
		return studentList;
	}

	public void enroll(Student student){
		studentnumber++;
		studentList.add(student);
	}
	
	public void setName(String name){
		this.name = name;
	}
	public void setNumber(String number){
		this.number = number;
	}
	public String getName(){
		return this.name;
	}
	public String getNumber(){
		return this.number;
	}

	public int getNumberofstudent(){
		return studentnumber;
	}

}

  发现很多地方可以重构：

1：学生数量 不需要单独定义变量只需要过去List的长度

 

如果在两个或2个以上的方法中需要创建一个类的时候，可以定义成员变量，然后用setup（）方法提前初始化，这样的好处就是只需要初始化一次。如代码所示：

public class CourseSessionTest extends junit.framework.TestCase
{

	private CourseSession session;

	public void setUp(){
		session =  new CourseSession("ENGL","101");
	}

	public void testCreate(){
		//CourseSession session = new CourseSession("ENGL","101");
		Student student1 = new Student("mixian");
		Student student2 = new Student("longquan");
		session.enroll(student1);
		session.enroll(student2);
		java.util.ArrayList<Student> studentList =session.getAllStudentList();
		assertEquals(student1,studentList.get(0));
		assertEquals(student2,studentList.get(1));
		assertEquals(2,studentList.size());
	
		assertEquals("ENGL",session.getName());
		assertEquals("101",session.getNumber());
		//assertEquals(2,session.getNumberofstudent());
	/*
		CourseSession session2 = new CourseSession("CHIN","102");
		assertEquals("CHIN",session2.getName());
		assertEquals("102",session2.getNumber());
		//assertEquals(2,session2.getNumberofstudent());
	*/
	}	
}

 

在这里将测试招收学生的方法分离出来

public class CourseSessionTest extends junit.framework.TestCase
{

	private CourseSession session;

	public void setUp(){
		session =  new CourseSession("ENGL","101");
	}

	public void testEnroll(){
		Student student1 = new Student("mixian");
		Student student2 = new Student("longquan");
		session.enroll(student1);
		session.enroll(student2);
		java.util.ArrayList<Student> studentList =session.getAllStudentList();
		assertEquals(student1,studentList.get(0));
		assertEquals(student2,studentList.get(1));
		assertEquals(2,studentList.size());
	
	}

	public void testCreate(){
		//CourseSession session = new CourseSession("ENGL","101");
		
	
		assertEquals("ENGL",session.getName());
		assertEquals("101",session.getNumber());
		//assertEquals(2,session.getNumberofstudent());
	/*
		CourseSession session2 = new CourseSession("CHIN","102");
		assertEquals("CHIN",session2.getName());
		assertEquals("102",session2.getNumber());
		//assertEquals(2,session2.getNumberofstudent());
	*/
	}	
}

 

然后你发现测试招收学生的方法过于繁琐，所以重构后的方式是删除session.getStudentList();方法在Student中增加一个GET方法，避免student列表整个暴露出来

重构后的代码如下：

public class CourseSessionTest extends junit.framework.TestCase
{

	private CourseSession session;

	public void setUp(){
		session =  new CourseSession("ENGL","101");
	}

	public void testEnroll(){
		Student student1 = new Student("mixian");
		Student student2 = new Student("longquan");
		session.enroll(student1);
		session.enroll(student2);
		//重构删除 避免整个list暴露出来
		//java.util.ArrayList<Student> studentList =session.getAllStudentList();
		//assertEquals(student1,studentList.get(0));
		//assertEquals(student2,studentList.get(1));
		//assertEquals(2,studentList.size());
		assertEquals(student1,session.get(0));
		assertEquals(student2,session.get(1));
		assertEquals(2,session.getNumberofstudent());
	}

	public void testCreate(){
		//CourseSession session = new CourseSession("ENGL","101");
		
	
		assertEquals("ENGL",session.getName());
		assertEquals("101",session.getNumber());
		//assertEquals(2,session.getNumberofstudent());
	/*
		CourseSession session2 = new CourseSession("CHIN","102");
		assertEquals("CHIN",session2.getName());
		assertEquals("102",session2.getNumber());
		//assertEquals(2,session2.getNumberofstudent());
	*/
	}	
}