参数化Singleton类测试

Question

我正在为Singleton类编写测试用例。但调用将转到原始依赖项
模拟注入不适用于数学和艺术。

private final Math math;
private final Art art;
private final tot;
private Student(Math math, Art art){
this.math = math;
this.art = art;
}
public static Student getInstance() {
Student st= new Student(new Mant(), new Art());
st.display();
return st;
}
public void display() {
tot = math.getScore() + art.getScore();
}
}

测试等级

public class StudentTest{
@Test
@PrepareForTest(Student.class)
void testDisplay() {
Math mockMath = PowerMockito.mock(Math.class);
PowerMockito.when(mockMath.getScore()).thenReturn(80);
Math mockArt = PowerMockito.mock(Art.class);
PowerMockito.when(mockArt.getScore()).thenReturn(70);
Student mst= Student.getInstance();
mst.display();
assertEquals(mst.tot(), 150);
}
}

Answer 1

将@RunWith(PowerMockRunner.class)注释添加到测试类

@RunWith(PowerMockRunner.class)
public class StudentTest{
@Test
@PrepareForTest(Student.class)
void testDisplay() {
Math mockMath = PowerMockito.mock(Math.class);
PowerMockito.when(mockMath.getScore()).thenReturn(80);
Math mockArt = PowerMockito.mock(Art.class);
PowerMockito.when(mockArt.getScore()).thenReturn(70);
Student mst= Student.getInstance();
mst.display();
assertEquals(mst.tot(), 150);
}
}