如何将模拟注入私有方法？

Question

模拟对象在我访问公共方法时工作正常。但是当我访问私有方法时它不起作用。我的模拟课：@componentpublic class Test{public List<String> list(){ // some function}}我的主类：@componentpublic class Test2{private string method(String method){//here where i have to use mock object//some function}}我的测试用例：public class JunitTestCases{@MockTest test;@Autowired@InjectMocksTest2 test2public void Oncall{Test2 test=new Test2();Method method=Test2.class.getDeclaredMethod("method",String.class);method.setAccessible(true);method.invoke(test, "data");}}我得到以下错误。java.lang.reflect.InvocationTargetExceptionat sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)at java.lang.reflect.Method.invoke(Unknown Source)at com.TestCases.method(TestClass.java:198)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)at java.lang.reflect.Method.invoke(Unknown Source)at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)任何建议？我怎样才能让它工作？

Answer 1

在调用方法中，你使用字符串.class[paramter]而不是Class[][parameterArray]。

无需为 Test2 创建其他对象.class已经使用过@injectMocks只需在 invoke 方法中使用变量即可。

public class JunitTestCases{

@Mock

Test test;

@InjectMocks

Test2 test2;

@Test

public void Oncall{

     MockitoAnnotations.initMocks(this);

      Class<?>[] params = new Class<?>[]{String.class};

      Method method=Test2.class.getDeclaredMethod("method",params);

       method.setAccessible(true);

       method.invoke(test2, "data");

    }

}

Answer 2

用于编写测试的演示类

public class PowerMockDemo {

    public Point callPrivateMethod() {

        return privateMethod(new Point(1, 1));

    }

    private Point privateMethod(Point point) {

        return new Point(point.getX() + 1, point.getY() + 1);

    }

}

演示类 的测试类

@RunWith(PowerMockRunner.class)

@PrepareForTest(PowerMockDemo.class)

public class PowerMockDemoTest {

    private PowerMockDemo powerMockDemoSpy;

    @Before

    public void setUp() {

        powerMockDemoSpy = PowerMockito.spy(new PowerMockDemo());

    }

    @Test

    public void testMockPrivateMethod() throws Exception {

        Point mockPoint = mock(Point.class);

        PowerMockito.doReturn(mockPoint)

            .when(powerMockDemoSpy, "privateMethod", anyObject());

        Point actualMockPoint = powerMockDemoSpy.callPrivateMethod();

        assertThat(actualMockPoint, is(mockPoint));

    }

}