Mockito - 0 Matchers Expected, 1 Recorded (InvalidUseOfMatchersException)

user_1521583 0
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I'm trying to mock up some mongo classes so that I don't need a connection (fairly standard stuff) but the following code gives me problems:

when(dbCollection.find(isA(DBObject.class))).thenReturn(dbCursor);

Running this get's me:

org.mockito.exceptions.misusing.InvalidUseOfMatchersException:
Invalid use of argument matchers!
0 matchers expected, 1 recorded:
at ...GridFileManagerTest.beforeClass(GridFileManagerTest.java:67)

This exception may occur if matchers are combined with raw values:
//incorrect: someMethod(anyObject(), "raw String");

When using matchers, all arguments have to be provided by matchers.
For example:
//correct:
someMethod(anyObject(), eq("String by matcher"));

For more info see javadoc for Matchers class.

If I were to do this though:

when(dbCollection.find(mock(DBObject.class))).thenReturn(dbCursor);

it no longer has that problem. This doesn't seem to accomplish what I want though - I want to return the value when the method is called with an object of type DBObject.

Thoughts?

mockito mocking exception java
4 Answers

This same issue can be reproduced in Scala if you have default arguments. It may look like you're providing any() for every argument, but you should verify that the method definition doesn't have any default parameters which might be messing things up.

user_11574400

In my case the mocked method was final. Removing the final from the method signature solved the problem.

user_51512020

Probably unrelated, but I encountered the same error when I spied a package private method. Changing it to public solved the issue for me.

user_24412990
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