update tests (regression)

    public Figure greatestFigure() {

        if (numF == 0)

            return null;

        Figure f = figuresList[0];

        double a = figuresList[0].area();

        for (int i = 1; i < numF; i++) {

            double b = figuresList[i].area();

            if (a < b) {

                f = figuresList[i];

                a = b;

            }

        }

        return f;

    }

}

class Figure {

    int area() {

        return 5;

    }

}