inheritance

void StudentBehaviorWithSatisfactionSupervisor() {
        Student p("ivan"s, 17);
        SatisfactionSupervisor sup{105, 107};
        p.SetObserver(&sup);

        ASSERT_EQUAL(p.GetDanceCount(), 0);
        ASSERT_EQUAL(p.GetSatisfaction(), 100);
        ASSERT_EQUAL(p.GetKnowledgeLevel(), 0);
        p.LiveADay();
        ASSERT_EQUAL(p.GetDanceCount(), 10);
        ASSERT_EQUAL(p.GetSatisfaction(), 107);
        ASSERT_EQUAL(p.GetKnowledgeLevel(), 1);

        p.Dance();
        ASSERT_EQUAL(p.GetDanceCount(), 10 + 1);
        ASSERT_EQUAL(p.GetSatisfaction(), 107 + 1);
        ASSERT_EQUAL(p.GetKnowledgeLevel(), 1);
        p.LiveADay();
        ASSERT_EQUAL(p.GetDanceCount(), 10 + 1);
        ASSERT_EQUAL(p.GetSatisfaction(), 107 + 1 - 3);
        ASSERT_EQUAL(p.GetKnowledgeLevel(), 1 + 1);

        p.Dance();
        p.Dance();
        ASSERT_EQUAL(p.GetDanceCount(), 10 + 1 + 2);
        ASSERT_EQUAL(p.GetSatisfaction(), 107 + 1 - 3 + 2);
        ASSERT_EQUAL(p.GetKnowledgeLevel(), 1 + 1);

        p.Study();
        ASSERT_EQUAL(p.GetDanceCount(), 10 + 1 + 2 + 3);
        ASSERT_EQUAL(p.GetSatisfaction(), 107);
        ASSERT_EQUAL(p.GetKnowledgeLevel(), 1 + 1 + 1);

        const auto& p_c = p;
        ASSERT_EQUAL(p_c.GetDanceCount(), 10 + 1 + 2 + 3);
        ASSERT_EQUAL(p_c.GetSatisfaction(), 107);
        ASSERT_EQUAL(p_c.GetKnowledgeLevel(), 1 + 1 + 1);
    }