'Mockito Mongotemplate AggregationResults.getMappedResults getting nullpointer exception

catTemplate.aggregate(cat, cat_collection,Cat.class).getMappedResults()

I want to mock above line so i have written below code

@Mock
MongoTemplate catTemplate;

AggregationResults<Cat> mockResults = (AggregationResults<Cat>) mock(
                AggregationResults.class);

            
  when(catTemplate.aggregate(any(Aggregation.class), anyString(),
              eq(Cat.class))) .thenReturn(mockResults);
  when(mockResults.getMappedResults()).thenReturn(catList);

I am getting null pointer exception, any one help on this

javajunitmockito


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