How to use cleanStackTraces method of org.mockitousage.junitrunner.SilentRunnerTest class

Best Mockito code snippet using org.mockitousage.junitrunner.SilentRunnerTest.cleanStackTraces

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1this.mock = mock(Interface.class, withSettings().defaultAnswer(2 new Answer() {3 public Object answer(InvocationOnMock invocation) throws Throwable {4 return invocation.getMethod().getReturnType().newInstance();5 }6 }7 ));8 at org.mockito.internal.creation.instance.Instantiator.newInstance(Instantiator.java:21)9 at org.mockito.internal.creation.bytebuddy.MockMethodInterceptor$MockitoMock$MockitoMockingState$DefaultAnswerForwardsAnswers.answer(MockMethodInterceptor.java:191)10 at org.mockito.internal.handler.MockHandlerImpl.handle(MockHandlerImpl.java:92)11 at org.mockito.internal.handler.NullResultGuardian.handle(NullResultGuardian.java:29)12 at org.mockito.internal.handler.InvocationNotifierHandler.handle(InvocationNotifierHandler.java:38)13 at org.mockito.internal.creation.bytebuddy.MockMethodInterceptor.doIntercept(MockMethodInterceptor.java:63)14 at org.mockito.internal.creation.bytebuddy.MockMethodInterceptor.doIntercept(MockMethodInterceptor.java:52)15 at org.mockito.internal.creation.bytebuddy.MockMethodInterceptor$DispatcherDefaultingToRealMethod.interceptSuperCallable(MockMethodInterceptor.java:105)16 at org.mockito.internal.creation.bytebuddy.MockMethodInterceptor$DispatcherDefaultingToRealMethod.interceptSuperCallable(MockMethodInterceptor.java:97)17 at org.mockitousage.junitrunner.SilentRunnerTest$1.method(SilentRunnerTest.java:29)18 at org.mockitousage.junitrunner.SilentRunnerTest$1.method(SilentRunnerTest.java:26)19 at org.mockitousage.junitrunner.SilentRunnerTest.test(SilentRunnerTest.java:26)20 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)21 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl

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What you are asking is not possible because your legacy code relies on a static method getInstance() and Mockito does not allow to mock static methods, so the following line won't work

when(FormatterService.getInstance()).thenReturn(formatter);

There are 2 ways around this problem:

  1. Use a different mocking tool, such as PowerMock, that allows to mock static methods.

  2. Refactor your code, so that you don't rely on the static method. The least invasive way I can think of to achieve this is by adding a constructor to DriverSnapshotHandler that injects a FormatterService dependency. This constructor will be only used in tests and you production code will continue to use the real singleton instance.

    public static class DriverSnapshotHandler {
    
        private final FormatterService formatter;
    
        //used in production code
        public DriverSnapshotHandler() {
            this(FormatterService.getInstance());
        }
    
        //used for tests
        DriverSnapshotHandler(FormatterService formatter) {
            this.formatter = formatter;
        }
    
        public String getImageURL() {
            return formatter.formatTachoIcon();
        }
    }
    

Then, your test should look like this :

FormatterService formatter = mock(FormatterService.class);
when(formatter.formatTachoIcon()).thenReturn("MockedURL");
DriverSnapshotHandler handler = new DriverSnapshotHandler(formatter);
handler.getImageURL();
verify(formatter, atLeastOnce()).formatTachoIcon();
https://stackoverflow.com/questions/38914433/mocking-a-singleton-with-mockito

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