How to mock An Interface Java PowerMockito
I m trying to mock an interface. public interface FlowCopyParamsBusinessManager { List<FlowCopyParams> findByAppli(String application, String sourcePattern) throws FlowCopyParamsBusinessException; } In my code, when i call this method findByAppli , i would like to return a list of FlowCopyParams. List<FlowCopyParams> lstFlowCopyParams = flowCopyParamsBusinessManager.findByAppli( "TOTO","TATA); Here my try in the class test: @BeforeClass public static void mockBeanIn() throws Exception { List<FlowCopyParams> flowCopyParamsList = new ArrayList<>(); PowerMockito.spy(FlowCopyParamsBusinessManager