java - org.mockito.exceptions.misusing.MissingMethodInitationException : when() requires an argument which has to be 'a method call on a mock'

Question

我开发了一个带有 Controller 的 Spring 示例项目，并在其中调用了静态方法。

当我尝试运行代码时，它导致出现异常。

LoginController.java

@Controller
public class LoginController {@ResponseBody
@RequestMapping(value="/login")
public String login(){
    System.out.println("in login method");
    String s = SampleClass.method();
    System.out.println("String value :  "+s);
    return "welcome to login page";
}}

SampleClass.java

public class SampleClass {

public static String method(){
    System.out.println("in static method");
    return "static method";
}}

LoginControllerTest.java

@PrepareForTest(SampleClass.class)
public class LoginControllerTest {

private MockMvc mockMvc;

@InjectMocks
private LoginController loginController;


@Before
public void setUp() {

    System.out.println("in setup");
    PowerMockito.mockStatic(SampleClass.class);

    MockitoAnnotations.initMocks(this);
    mockMvc = MockMvcBuilders.standaloneSetup(loginController).build();
    System.out.println("setupdone");

}

@Test
public void loginTest() throws Exception{
    System.out.println("in login test");
    PowerMockito.when(SampleClass.method()).thenReturn("hello");
    mockMvc.perform(get("/login"))
    //.andDo(print())
    .andExpect(status().isOk());
    System.out.println("test completed");
}}

错误

org.mockito.exceptions.misusing.MissingMethodInvocationException: when() requires an argument which has to be 'a method call on a mock'. For example: when(mock.getArticles()).thenReturn(articles);

Also, this error might show up because: 1. you stub either of: final/private/equals()/hashCode() methods. Those methods cannot be stubbed/verified. Mocking methods declared on non-public parent classes is not supported. 2. inside when() you don't call method on mock but on some other object.

at org.powermock.api.mockito.PowerMockito.when(PowerMockito.java:495) at com.junit.example.controller.LoginControllerTest.setUp(LoginControllerTest.java:57) 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:47) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44) at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229) at org.junit.runners.ParentRunner.run(ParentRunner.java:309) 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:675) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)

谁能帮我解决一下吗？

Answer 1

根据文档，您没有正确使用它: https://github.com/powermock/powermock/wiki/MockitoUsage

来自文档:

1. 使用 @PrepareForTest(Static.class) 注释该类 (您没有这样做)
2. 调用mockStatic PowerMockito.mockStatic(Static.class);
3. 使用Mockito.when()。您正在使用PowerMockito.when()