@Test
void check_Absent_in_declaredTypeToTypeElement() {

    // following is not really useful
    DeclTypeHelper declTypeHelper = new DeclTypeHelper();
    DeclaredType mockedType =  mock(DeclaredType.class);
    assertEquals(declaredTypeToTypeElement(null), Optional.empty());
    assertEquals(declaredTypeToTypeElement(mockedType), Optional.empty());
}