java - PowerMockito ClassNotPreparedException

Question

我有以下 jar :

javax.servlet-api-3.1.9.jar
junit-4.10.jar
mockito-all-1.10.19.jar
mockito-core-1.10.19.jar
powermock-api-mockito-1.6.5.jar
powermock-api-mockito-common-1.6.5.jar
powermock-api-support-1.6.5.jar
powermock-core-1.6.5.jar
powermock-module-junit4-1.6.5.jar
powermock-reflect-1.6.5.jar

我想测试这个名为 createPanel 的方法，它位于一个名为 Controller 的类中:

public static void createPanel(HttpServletRequest req, HttpServletResponse res, HttpSession hs) throws IOException
{
    PanelManager.createPanel(req, res, hs);
}

在 ControllerTest 类(junit 测试器)中，我有这个:

 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 import java.io.IOException;
 import java.io.PrintWriter;
 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import javax.servlet.http.HttpSession;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.mockito.Mockito;
 import org.mockito.runners.MockitoJUnitRunner;
 import org.powermock.api.mockito.PowerMockito;
 import org.powermock.core.classloader.annotations.PrepareForTest;
 import org.powermock.modules.junit4.PowerMockRunner;
 import ApplicationLogic.Controller;
 import ApplicationLogic.PanelManager;
 import ApplicationLogic.RegistrationManager;
 import ApplicationLogic.SessionManager;

 @PrepareForTest(PanelManager.class)
 @RunWith(MockitoJUnitRunner.class)

 public class ControllerTest {

     Controller controller = Mockito.mock(Controller.class);

     SessionManager sessionManager = Mockito.mock(SessionManager.class);

     RegistrationManager registrationManager =  Mockito.mock(RegistrationManager.class);
      .
      .
      .
      .

  @Test

 public void testcreatePanel() throws ServletException, IOException{

    HttpServletRequest req = Mockito.mock(HttpServletRequest.class);
    HttpServletResponse res = Mockito.mock(HttpServletResponse.class);
    HttpSession hs = Mockito.mock(HttpSession.class);


    //PowerMockito.mock(SessionManager.class);

    PrintWriter writer = new PrintWriter("somefile.txt");
    when(res.getWriter()).thenReturn(writer);

    PowerMockito.mockStatic(Controller.class);

    PowerMockito.doCallRealMethod().when(controller).createPanel(req, res, hs);

Controller 类中其他方法的所有测试都运行良好。为什么它在 PowerMockito.doCallRealMethod() 处导致此错误:

org.powermock.api.mockito.ClassNotPreparedException: 
The class ApplicationLogic.Controller not prepared for test.
To prepare this class, add class to the '@PrepareForTest' annotation.
In case if you don't use this annotation, add the annotation on class or  method level. 

    at org.powermock.api.mockito.expectation.reporter.MockitoPowerMockReporter.classNotPrepared(MockitoPowerMockReporter.java:31)
    at org.powermock.api.mockito.internal.mockcreation.MockTypeValidatorFactory$DefaultMockTypeValidator.validate(MockTypeValidatorFactory.java:38)
    at org.powermock.api.mockito.internal.mockcreation.AbstractMockCreator.validateType(AbstractMockCreator.java:18)
    at org.powermock.api.mockito.internal.mockcreation.MockCreator.createMock(MockCreator.java:57)
    at org.powermock.api.mockito.internal.mockcreation.MockCreator.mock(MockCreator.java:47)
    at org.powermock.api.mockito.PowerMockito.mockStatic(PowerMockito.java:71)
    at JUnitTest.ControllerTest.testcreatePanel(ControllerTest.java:253)
    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:45)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
    at org.mockito.internal.runners.JUnit45AndHigherRunnerImpl.run(JUnit45AndHigherRunnerImpl.java:37)
    at org.mockito.runners.MockitoJUnitRunner.run(MockitoJUnitRunner.java:62)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)

Answer 1

您必须使用 PowerMockRunner 而不是 MockitoJUnitRuner。

此示例解决了 ClassNotPreparedException:

@RunWith(PowerMockRunner.class)
@PrepareForTest({PanelManager.class})
public class ControllerTest {

    Controller controller = Mockito.mock(Controller.class);

    @Test
    public void testcreatePanel() throws Exception {
        HttpServletRequest req = Mockito.mock(HttpServletRequest.class);
        HttpServletResponse res = Mockito.mock(HttpServletResponse.class);
        HttpSession hs = Mockito.mock(HttpSession.class);

        PrintWriter writer = new PrintWriter("somefile.txt");
        Mockito.when(res.getWriter()).thenReturn(writer);

        PowerMockito.mockStatic(PanelManager.class);
        PowerMockito.doCallRealMethod().when(controller).createPanel(req, res, hs);
    }
}

但是，看起来即使在那之后可能仍然存在一些问题；您正在模拟 Controller，然后通过在其上调用 doCallRealMethod() 将其视为部分模拟。也许这有一个真正的原因(也许这个原因会通过显示更多你的代码来揭示)但如果你没有真正的原因那么你可以删除这一行:

Controller controller = Mockito.mock(Controller.class);

并替换这一行...

PowerMockito.doCallRealMethod().when(controller).createPanel(req, res, hs);

用这个:

Controller.createPanel(req, res, hs);

这将允许您模拟 PanelManager 的行为并测试 Controller 的实际行为以响应 PanelManager 的模拟行为。