How to tell a Mockito mock object to return something different the next time it is called

Question

So  I m creating a mock object as a static variable on the class level like so     In one test  I want Foo someMethod   to return a certain value  while in another test  I want it to return a different value   The problem I m having is that it seems I need to rebuild the mocks to get this to work correctly   I d like to avoid rebuilding the mocks  and just use the same objects in each test    class TestClass        private static Foo mockFoo        BeforeClass     public static void setUp             mockFoo   mock Foo class               Test     public void test1             when mockFoo someMethod    thenReturn 0            TestObject testObj   new TestObject mockFoo            testObj bar       calls mockFoo someMethod    receiving 0 as the value              Test     public void test2             when mockFoo someMethod    thenReturn 1            TestObject testObj   new TestObject mockFoo            testObj bar       calls mockFoo someMethod    STILL receiving 0 as the value  instead of expected 1              In the second test  I m still receiving 0 as the value when testObj bar   is called    What is the best way to resolve this   Note that I know I could use a different mock of Foo in each test  however  I have to chain multiple requests off of mockFoo  meaning I d have to do the chaining in each test

User · Answer

Or  even cleaner   when mockFoo someMethod    thenReturn obj1  obj2

User · Answer

For all who search to return something and then for another call throw exception  when mockFoo someMethod             thenReturn obj1           thenReturn obj2           thenThrow new RuntimeException  quot Fail quot      or when mockFoo someMethod             thenReturn obj1  obj2           thenThrow new RuntimeException  quot Fail quot

User · Answer

You could also Stub Consecutive Calls   10 in 2 8 9 api   In this case  you would use multiple thenReturn calls or one thenReturn call with multiple parameters  varargs    import static org junit Assert assertEquals  import static org mockito Mockito mock  import static org mockito Mockito when   import org junit Before  import org junit Test   public class TestClass        private Foo mockFoo        Before     public void setup             setupFoo                Test     public void testFoo             TestObject testObj   new TestObject mockFoo            assertEquals 0  testObj bar             assertEquals 1  testObj bar             assertEquals -1  testObj bar             assertEquals -1  testObj bar                private void setupFoo             mockFoo   mock Foo class            when mockFoo someMethod                 thenReturn 0               thenReturn 1               thenReturn -1     any subsequent call will return -1             Or a bit shorter with varargs          when mockFoo someMethod                 thenReturn 0  1  -1     any subsequent call will return -1

User · Answer

For Anyone using spy   and the doReturn   instead of the when   method    what you need to return different object on different calls is this   doReturn obj1  doReturn obj2  when this spyFoo  someMethod         For classic mocks   when this mockFoo someMethod    thenReturn obj1  obj2     or with an exception being thrown   when mockFoo someMethod             thenReturn obj1           thenThrow new IllegalArgumentException             thenReturn obj2  obj3

User · Answer

First of all don t make the mock static  Make it a private field  Just put your setUp class in the  Before not  BeforeClass  It might be run a bunch  but it s cheap   Secondly  the way you have it right now is the correct way to get a mock to return something different depending on the test

[java] How to tell a Mockito mock object to return something different the next time it is called?

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