UnfinishedStubbingException avec PowerMockito

Question

Je veux tester une méthode qui utilise une méthode statique à l'intérieur, c'est pourquoi j'utilise PowerMockito. Je veux simuler un appel à Request.Get à partir de l'API Http Client Fluent. J'ai mis en place un test simple mais j'ai obtenu un UnfinishedStubbingException et je ne comprends pas pourquoi.

Mockito 2.8.9 et Powermock 1.7.1

@RunWith(PowerMockRunner.class) 
@PrepareForTest(Request.class) 
public class MyApiServiceTest { 

    @Test 
    public void callTest() throws IOException, JSONException, URISyntaxException { 
     PowerMockito.mockStatic(Request.class); 
     Path path = Paths.get(getClass().getClassLoader().getResource("data.json").toURI()); 
     byte[] fileBytes = Files.readAllBytes(path); 
     Content content = new Content(fileBytes, ContentType.APPLICATION_JSON); 
     PowerMockito.doReturn(content).when(Request.Get(anyString()).execute().returnContent()); 
    } 

} 

Stacktrace

org.mockito.exceptions.misusing.UnfinishedStubbingException: 
Unfinished stubbing detected here: 
-> at com.example.service.MyApiServiceTest.callTest(MyApiServiceTest.java:42) 

E.g. thenReturn() may be missing. 
Examples of correct stubbing: 
    when(mock.isOk()).thenReturn(true); 
    when(mock.isOk()).thenThrow(exception); 
    doThrow(exception).when(mock).someVoidMethod(); 
Hints: 
1. missing thenReturn() 
2. you are trying to stub a final method, which is not supported 
3: you are stubbing the behaviour of another mock inside before 'thenReturn' instruction if completed 


    at org.powermock.core.MockGateway.doMethodCall(MockGateway.java:182) 
    at org.powermock.core.MockGateway.doMethodCall(MockGateway.java:164) 
    at org.powermock.core.MockGateway.methodCall(MockGateway.java:141) 
    at org.apache.http.client.fluent.Request.Get(Request.java) 
    at com.example.service.MyApiServiceTest.callTest(MyApiServiceTest.java:42) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:498) 
    at org.junit.internal.runners.TestMethod.invoke(TestMethod.java:68) 
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:326) 
    at org.junit.internal.runners.MethodRoadie$2.run(MethodRoadie.java:89) 
    at org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadie.java:97) 
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.executeTest(PowerMockJUnit44RunnerDelegateImpl.java:310) 
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTestInSuper(PowerMockJUnit47RunnerDelegateImpl.java:131) 
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.access$100(PowerMockJUnit47RunnerDelegateImpl.java:59) 
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner$TestExecutorStatement.evaluate(PowerMockJUnit47RunnerDelegateImpl.java:147) 
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.evaluateStatement(PowerMockJUnit47RunnerDelegateImpl.java:107) 
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTest(PowerMockJUnit47RunnerDelegateImpl.java:82) 
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runBeforesThenTestThenAfters(PowerMockJUnit44RunnerDelegateImpl.java:298) 
    at org.junit.internal.runners.MethodRoadie.runTest(MethodRoadie.java:87) 
    at org.junit.internal.runners.MethodRoadie.run(MethodRoadie.java:50) 
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.invokeTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:218) 
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.runMethods(PowerMockJUnit44RunnerDelegateImpl.java:160) 
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$1.run(PowerMockJUnit44RunnerDelegateImpl.java:134) 
    at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:34) 
    at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:44) 
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.run(PowerMockJUnit44RunnerDelegateImpl.java:136) 
    at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.run(JUnit4TestSuiteChunkerImpl.java:121) 
    at org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.run(AbstractCommonPowerMockRunner.java:57) 
    at org.powermock.modules.junit4.PowerMockRunner.run(PowerMockRunner.java:59) 
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137) 
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68) 
    at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47) 
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242) 
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70) 

Answer 1

Il semble que vous essayez de se moquer trop de choses en même temps.

Essayez de stub les méthodes indépendamment execute() et returnContent():

@Test 
    public void callTest() throws IOException, JSONException, URISyntaxException { 
     // Arrange 
     PowerMockito.mockStatic(Request.class); 
     Request requestStub = Mockito.mock(Request.class); 
     Response responseStub = Mockito.mock(Response.class); 
     Path path = Paths.get(getClass().getClassLoader().getResource("data.json").toURI()); 
     byte[] fileBytes = Files.readAllBytes(path); 
     Content content = new Content(fileBytes, ContentType.APPLICATION_JSON); 

     Mockito.doReturn(responseStub).when(requestStub).execute(); 
     Mockito.doReturn(content).when(responseStub).returnContent(); 
     PowerMockito.doReturn(requestStub).when(Request.class, Mockito.anyString(), "Get"); 

     // Act and assert 
    } 

Alors powermockito est seulement utilisé pour retourner le requestStub tout le reste peut être fait avec Mockito plaine.