Mockito mock on abstract class

[copper lichen]

import static org.mockito.Answers.CALLS_REAL_METHODS;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

public abstract class IssouTest {
    private int id;

    public int getId() {
        return id;
    }

    public int getId2() {
        return getId();
    }

    public static void main(String[] args) {
        IssouTest a = mock(CALLS_REAL_METHODS);
        when(a.getId()).thenReturn(1);
        
        // why is this false ?
        System.out.println(a.getId2()== 1);
    }
}

why this is not true

[teal jacinth]

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[copper lichen]

Mockito mock on abstract class