Mockito InvalidUseOfMatchersException

Question

I have a command line tool that performs a DNS check  If the DNS check succeeds  the command proceeds with further tasks  I am trying to write unit tests for this using Mockito  Here s my code   public class Command                     void runCommand                           dnsCheck hostname  new InetAddressFactory                              do other stuff after dnsCheck            void dnsCheck String hostname  InetAddressFactory factory               calls to verify hostname           I am using InetAddressFactory to mock a static implementation of the InetAddress class  Here s the code for the factory   public class InetAddressFactory       public InetAddress getByName String host  throws UnknownHostException           return InetAddress getByName host             Here s my unit test case    RunWith MockitoJUnitRunner class  public class CmdTest           many functional tests for dnsCheck         here s the piece of code that is failing        in this test I want to test the rest of the code  i e  after dnsCheck       Test     void testPostDnsCheck             final Cmd cmd   spy new Cmd                 this line does not work  and it throws the exception below             tried using  InetAddressFactory  anyObject           doNothing   when cmd  dnsCheck HOST  any InetAddressFactory class            cmd runCommand              Exception on running testPostDnsCheck   test   org mockito exceptions misusing 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  For example        correct      someMethod anyObject    eq  String by matcher       Any input on how to solve this

User · Accepted Answer

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

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

May be helpful for somebody  Mocked method must be of mocked class  created with mock MyService class

User · Answer

Do not use Mockito anyXXXX    Directly pass the value to the method parameter of same type  Example  A expected   new A 10    String firstId    quot 10w quot   String secondId    quot 20s quot   String product    quot Test quot   String type    quot type2 quot   Mockito when service getTestData firstId  secondId  product type   thenReturn expected    public class A     int a      public A int a          this a   a

User · Answer

Inspite of using all the matchers  I was getting the same issue    org mockito exceptions misusing InvalidUseOfMatchersException   Invalid use of argument matchers  1 matchers expected  3 recorded     It took me little while to figure this out that the method I was trying to mock was a static method of a class say Xyz class  which contains only static method and I forgot to write following line   PowerMockito mockStatic Xyz class     May be it will help others as it may also be the cause of the issue

[java] Mockito: InvalidUseOfMatchersException

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