Question

我正试图改变一种内心的方法,即我的测试方法。

我的同仁们希望这样做。

public class App {
public Student getStudent() {
    MyDAO dao = new MyDAO();
    return dao.getStudentDetails();//getStudentDetails is a public 
                                  //non-static method in the DAO class
}

当我写给该方法的主人时,电磁会会改变该行。

dao.getStudentDetails();

或使上诉组在黄麻处决期间使用模拟 da子,而不是与亚洲开发银行有联系的实际 da声?

Answer 1

可在电磁场(见。

全面测试

import org.junit.*;
import org.junit.runner.RunWith;
import org.mockito.Mockito;
import org.powermock.api.mockito.PowerMockito;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;

import static org.junit.Assert.*;

@RunWith(PowerMockRunner.class)
@PrepareForTest(App.class)
public class AppTest {
    @Test
    public void testGetStudent() throws Exception {
        App app = new App();
        MyDAO mockDao = Mockito.mock(MyDAO.class);
        Student mockStudent = Mockito.mock(Student.class);

        PowerMockito.whenNew(MyDAO.class).withNoArguments().thenReturn(mockDao);
        Mockito.when(mockDao.getStudentDetails()).thenReturn(mockStudent);
        Mockito.when(mockStudent.getName()).thenReturn("mock");

        assertEquals("mock", app.getStudent().getName());
    }
}

我为这一测试案例制作了一个简单的学生班:

public class Student {
    private String name;
    public Student() {
        name = "real";
    }
    public String getName() {
        return name;
    }
}

Answer 2

为了摆脱模拟框架,必须注入MyDAO的物体。你们要么可以使用像春ice这样的东西,要么只是利用工厂模式向你们提供DAO物体。然后,在你的单位试验中,你有一个试验工厂,为你提供 mo子,而不是真正的 objects子。之后,你可以写成法典,例如:

Mockito.when(mockDao.getStudentDetails()).thenReturn(someValue);

Answer 3

如果你没有机会进入Mockito,你也可以利用PowerMock实现同样的目的。例如,你可以做以下工作:

@RunWith(PowerMockRunner.class)
@PrepareForTest(App.class)
public class AppTest {
    @Test
    public void testGetStudent() throws Exception {
        MyDAO mockDao = createMock(MyDAO.class);
        expect(mockDao.getStudentDetails()).andReturn(new Student());        
        replay(mockDao);        

        PowerMock.expectNew(MyDAO.class).andReturn(mockDao);
        PowerMock.replay(MyDAO.class);         
        // make sure to replay the class you expect to get called

        App app = new App();

        // do whatever tests you need here
    }
}

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