Mock private static method in final class using PowerMockito

Question

I have a final class with private static method which is invoked inside another static method

public final class GenerateResponse{
      private static Map<String, String> getErrorDetails(JSONObject jsonObject) {
         // implementation
      }

      public static String method1(params...){
         Map<String, String> map = getErrorDetails(new JsonObject());

         // implementation
      }
}

I need to mock the private static method call getErrorDetails(), but my test is calling the actual method. Here is my code:

@RunWith(PowerMockRunner.class)
@PrepareForTest(GenerateResponse.class)
public class GenerateResponseTest{

@Test
public void testFrameQtcErrorResponse() throws Exception {
    Map<String, String> errorDtls = new HashMap<String, String>();

    PowerMockito.spy(GenerateResponse.class);
    PowerMockito.doReturn(errorDtls).when(GenerateResponse.class, "getErrorDetails", JSONObject.class);
    String response = GenerateResponse.method1(params...);
}

Try adding `PowerMockito.mockStatic(GenerateResponse.class)` — Tim Biegeleisen, Sep 16 '15 at 05:22

score 5 · Answer 1 · edited Sep 16 '15 at 06:31

You should use an argument matcher in the whenmethod. I've modified your code a little bit to run the test case.

Actual method

public final class GenerateResponse{

    private static Map<String, String> getErrorDetails(JSONObject jsonObject) {
       return null;
    }

    public static String method1() {
    Map<String, String> map = getErrorDetails(new JSONObject());
    return map.get("abc");
    }
}

Test method

@RunWith(PowerMockRunner.class)
@PrepareForTest(GenerateResponse.class)
public class GenerateResponseTest {

@Test
public void testFrameQtcErrorResponse() throws Exception {
    Map<String, String> errorDtls = new HashMap<String, String>();
    errorDtls.put("abc", "alphabets");

    PowerMockito.mockStatic(GenerateResponse.class, Mockito.CALLS_REAL_METHODS);

    PowerMockito.doReturn(errorDtls).when(GenerateResponse.class,
            "getErrorDetails", Matchers.any(JSONObject.class));

    String response = GenerateResponse.method1();

    System.out.println("response =" + response);

   }

 }

Output

response =alphabets

Mock private static method in final class using PowerMockito

1 Answers1