public void ReturnChorobaByIndex(int index, string expected)
{
Pacjent pacjent1 = new Pacjent("probe", "20");
Choroba choroba = new Choroba("name", "20.02.2020");
Choroba choroba1 = new Choroba("syfilis", "20.02.2020");
Choroba choroba2 = new Choroba("gruźlica", "20.02.2020");
Choroba choroba3 = new Choroba("Covid", "20.02.2020");
Choroba choroba4 = new Choroba("HIV", "20.02.2020");
pacjent1.addChoroba(choroba);
pacjent1.addChoroba(choroba1);
pacjent1.addChoroba(choroba2);
pacjent1.addChoroba(choroba3);
pacjent1.addChoroba(choroba4);
var result = pacjent1.showChorobaByIndex(index);
Assert.That(result.Name, Is.EqualTo(expected));
}