Mockito error MissingMethodInvocationException

Question

I'am writing test for my program, but I get exception on this part.

@Test public void test(){ HttpSession session = new MockHttpSession(); //other code ... // #1 MissingMethodInvocationException when(session.getAttribute(SessionConstants.SESSION)).thenReturn(image); runClassMyApp.method(session); // #2 I can't get attribute from session I get `null`. List<MyClass> = (ArrayList) session.getAttribute(SessionConstants.SESSION); }

If I replace:

`HttpSession session = new MockHttpSession();`

to:

@Mock private HttpSession session;

Method who need testing

public void method(HttpSession session){ String value = session.getAttribute(SessionConstants.SESSION) List<String> result = new ArrayList(); result.add(value); session.setAttribute(SessionConstants.SESSION, result); }

If I use annotation @Mock i get #2 error, if I use MockHttpSession() i get #1 error

Its #1 Exception:

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. 2. inside when() you don't call method on mock but on some other object.

EJK · Accepted Answer · 2015-12-22 21:35:53Z

Although you have not posted the code for MockHttpSession, that appears to be a non-Mockito class which explains the error. As it states, when() can only be called on a mock created by Mockito.

You were right to then attempt to create the mock as follows:

@Mock private HttpSession session;

However you left out the call that actually does the creation:

MockitoAnnotations.initMocks(this);

Add the above line to your test, preferrably in a setup method, and the when() call should work.

I'am addMockitoAnnotations.initMocks(session); and create from using @Mock but this not helped. See new code

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