PowerMocking static does not return expected object

Question

I have a problem mocking Calendar.getInstance(). As you now this method returns a Calendar - the object I am mocking.

Right now my code looks like this:

Answer 1

It seems like you're doing everything right. For instance, this test below passes, proving that the Calendar returned by Calendar#getInstance() is in fact the one you set up with the static mocking.

import static org.junit.Assert.*;
import static org.powermock.api.mockito.PowerMockito.*;

import java.util.Calendar;
import java.util.GregorianCalendar;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;

@RunWith(PowerMockRunner.class)
@PrepareForTest(Calendar.class)
public class MockCalendarTest {
    @Test
    public void testFailingDatabase() {
        mockStatic(Calendar.class);

        final Calendar testCalendar = new GregorianCalendar();
        testCalendar.add(Calendar.HOUR, 1);
        when(Calendar.getInstance()).thenReturn(testCalendar);

        final Surveillance surveillance = new Surveillance();
        final Calendar resultCalendar = surveillance.checkDatabase();

        assertTrue(testCalendar == resultCalendar);
   }

    public static class Surveillance {
      public Calendar checkDatabase() {
        return Calendar.getInstance();
      }
    }
}

Perhaps post the relevant parts of the Surveillance class so we can see how it's trying to get a new Calendar and assess why it's failing.