Best Mockito code snippet using org.mockitousage.junitrunner.SilentRunnerTest.cleanStackTraces
cleanStackTraces
Using AI Code Generation
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:
Use a different mocking tool, such as PowerMock, that allows to mock static methods.
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();
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