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Mockito: InvalidUseOfMatchersException

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What is InvalidUseOfMatchersException?

InvalidUseOfMatchersException: Invalid use of argument matchers! 2 matchers expected, 1 recorded. 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.

What is EQ Mockito?

Mockito Argument Matcher - eq() When we use argument matchers, then all the arguments should use matchers. If we want to use a specific value for an argument, then we can use eq() method. when(mockFoo. bool(eq("false"), anyInt(), any(Object.

How do I use Mockito doNothing?

Mockito 's doNothing() is used when you want to test void methods because void methods do not return anything so there is no way you can verify using assert. These void methods may be anywhere, for example, in service class, in dao class, etc.


The error message outlines the solution. The line

doNothing().when(cmd).dnsCheck(HOST, any(InetAddressFactory.class))

uses one raw value and one matcher, when it's required to use either all raw values or all matchers. A correct version might read

doNothing().when(cmd).dnsCheck(eq(HOST), any(InetAddressFactory.class))

I had the same problem for a long time now, I often needed to mix Matchers and values and I never managed to do that with Mockito.... until recently ! I put the solution here hoping it will help someone even if this post is quite old.

It is clearly not possible to use Matchers AND values together in Mockito, but what if there was a Matcher accepting to compare a variable ? That would solve the problem... and in fact there is : eq

when(recommendedAccessor.searchRecommendedHolidaysProduct(eq(metas), any(List.class), any(HotelsBoardBasisType.class), any(Config.class)))
            .thenReturn(recommendedResults);

In this example 'metas' is an existing list of values


It might help some one in the future: Mockito doesn't support mocking of 'final' methods (right now). It gave me the same InvalidUseOfMatchersException.

The solution for me was to put the part of the method that didn't have to be 'final' in a separate, accessible and overridable method.

Review the Mockito API for your use case.


For my case, the exception was raised because I tried to mock a package-access method. When I changed the method access level from package to protected the exception went away. E.g. inside below Java class,

public class Foo {
    String getName(String id) {
        return mMap.get(id);
    }
}

the method String getName(String id) has to be AT LEAST protected level so that the mocking mechanism (sub-classing) can work.