如何将模拟注入私人方法

Question

当我访问公共方法时，模拟对象正常工作。但是当我访问私人方法时，它不起作用。

我的模拟类：

@component
public class Test{
public List<String> list(){
 // some function}
}

我的主要类：

@component
public class Test2{
private string method(String method){
//here where i have to use mock object
//some function
}
}

我的测试柜：

public class JunitTestCases{
@Mock
Test test;
@Autowired
@InjectMocks
Test2 test2
public void Oncall{
Test2 test=new Test2();
Method method=Test2.class.getDeclaredMethod("method",String.class);
method.setAccessible(true);
method.invoke(test, "data");}
}

我遇到以下错误。

java.lang.reflect.InvocationTargetException
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 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$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:298)
at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:292)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
at com.MainClass.validate(MainClass.java:149)
... 21 more

有什么建议吗？我该如何使其工作？

Answer 1

演示类，用于编写测试

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));
    }
}

Answer 2

在Indoke方法中，您使用 string.class [paramter] 而不是 class> class [] [] [parameterArray]。/strong>

无需创建test2的另一个对象。

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");
    }
}