如果要使用MockStudentDao,该如何修改代码
时间: 2023-06-20 19:08:11 浏览: 46
如果要使用MockStudentDao,需要进行以下几个步骤:
1. 创建MockStudentDao类,并实现StudentDao接口中的方法,以便在测试中模拟数据库访问的行为。示例代码如下:
```java
public class MockStudentDao implements StudentDao {
private List<Student> students = new ArrayList<>();
@Override
public List<Student> getAllStudents() {
return students;
}
@Override
public Student getStudentById(int id) {
for (Student student : students) {
if (student.getId() == id) {
return student;
}
}
return null;
}
@Override
public void addStudent(Student student) {
students.add(student);
}
@Override
public void updateStudent(Student student) {
for (int i = 0; i < students.size(); i++) {
if (students.get(i).getId() == student.getId()) {
students.set(i, student);
break;
}
}
}
@Override
public void deleteStudent(int id) {
students.removeIf(student -> student.getId() == id);
}
}
```
2. 修改StudentService类的构造函数,在其中使用MockStudentDao替换原来的StudentDao实现。示例代码如下:
```java
public class StudentService {
private StudentDao studentDao;
public StudentService() {
//this.studentDao = new MySqlStudentDao(); // 原来的实现
this.studentDao = new MockStudentDao(); // 使用MockStudentDao
}
// ...
}
```
3. 在测试代码中使用MockStudentDao进行测试。示例代码如下:
```java
public class StudentServiceTest {
private StudentService studentService;
@BeforeEach
public void setUp() {
studentService = new StudentService(new MockStudentDao());
}
@Test
public void testAddStudent() {
// ...
}
// ...
}
```
这样就可以使用MockStudentDao进行测试了。注意,使用Mock对象可以更方便地控制测试的环境和结果,提高测试的可靠性和效率。