JUnit test для метода main

public class Demo {
    public static void main(String[] args) {
        List<ElectricalAppliance> appliances = new ArrayList<>();
        Kettle kettle = new Kettle();
        appliances.add(kettle);
        appliances.add(new Boiler());
        appliances.add(new TVSet());
        appliances.add(new Fridge());
        appliances.add(new Microwave());
        int sumOfPower = WorkWithAppliances.sumOfPower(appliances);
        System.out.println("Sum of power: " + sumOfPower);
        kettle.turnOn();
        WorkWithAppliances.turnAllOn(appliances);
        for (ElectricalAppliance app : appliances) {
            System.out.println(app);
        }
        WorkWithAppliances.sortByPower(appliances);
        System.out.println("After sorting:");
        for (ElectricalAppliance app : appliances) {
            System.out.println(app);
        }
        ArrayList<ElectricalAppliance> resList = WorkWithAppliances.findByPower(appliances, 500, 1000);
        System.out.println("Appliances with power from 500 to 1000:");
        for (ElectricalAppliance app : resList) {
            System.out.println(app);
        }
    }
}