UnfinishedStubbingException when working with doNothing method for void methods

Question

The below code is causing UnfinishedStubbingException

PowerMockito.doNothing().when(widgetHelper).invokeAuditService(Matchers.eq(servletRequest), Matchers.eq(date), anyString(), Matchers.eq("Member_Servicing_Email_Update"), Matchers.eq(jsonObject), anyString());

     verify(widgetHelper, times(1)).invokeAuditService(Matchers.eq(servletRequest), Matchers.eq(date), anyString(), Matchers.eq("Member_Servicing_Email_Update1"), Matchers.eq(jsonObject), anyString());


org.mockito.exceptions.misusing.UnfinishedStubbingException: 
Unfinished stubbing detected here:
    -> at ....

    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, you naughty developer!

what I'm I missing here? Below is the method signature of invokeAuditService

public static void invokeAuditService(HttpServletRequest request, Date serviceCallTime, String response, 
            String activityKey, JSONObject detailsReplaceVal, String pmAccountId){
        AuditLogUtils.invokeAuditService(request, date, response, activityKey, json,  someString);
    }

I did this:

PowerMockito.mockStatic(WidgetHelper.class);
        PowerMockito.doNothing().when(WidgetHelper.class);
        WidgetHelper.invokeAuditService(Matchers.eq(servletRequest), Matchers.eq(date), anyString(), 
                Matchers.eq("Member_Servicing_Email_Update"), Matchers.eq(jsonObject), anyString());

verify(widgetHelper, times(1)).invokeAuditService(Matchers.eq(servletRequest), Matchers.eq(date), anyString(), 
                Matchers.eq("Member_Servicing_Email_Update123"), Matchers.eq(jsonObject), anyString());

Junit runs without any error but it supposed to fail since I have passed Member_Servicing_Email_Update in when and in verify its Member_Servicing_Email_Update123

Can you show `invokeAuditService` method signature? is it void/static? — Ori Marko, Jan 08 '20 at 10:28
see https://stackoverflow.com/questions/9585323/how-do-i-mock-a-static-method-that-returns-void-with-powermock — Ori Marko, Jan 08 '20 at 10:38
i don't get it. I am not able to connect the answer with my code. — Coder17, Jan 08 '20 at 10:50
mock statics the right way https://github.com/powermock/powermock/wiki/mockstatic (or don use statics at all...) — Antoniossss, Jan 08 '20 at 11:01

score 0 · Answer 1 · answered Jan 08 '20 at 12:00

The error is caused by the following line, which is invalid syntax: PowerMockito.doNothing().when(WidgetHelper.class);

When you create a mock all it method calls default to doNothing. So you do not need to declare it explictly.

However if you want to declare a behaviour you need to name the related method. Which is missing in the given line.

UnfinishedStubbingException when working with doNothing method for void methods

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