TestData.java

import java.time.LocalDate;
import java.time.Month;

public class TestData {

    public static String[] brands = {
        "Toyota",
        "Honda",
        "Chevrolet",
        "Ford",
        "Mercedes-Benz",
        "Jeep",
        "BMW",
        "Nissan",
        "Volkswagen",
        "Audi",
        "Ferrari"
    };

    public static Character[] letters = {
            'A',
            'B',
            'C',
            'D',
            'E',
            'F',
            'G',
            'H',
            'I',
            'J',
            'K',
            'L',
            'M',
            'N',
            'O',
            'P',
            'R',
            'S',
            'T',
            'U',
            'V',
            'W',
            'X',
            'Y',
            'Z'};

    public static String generateNumberPlate() {
        String numberPlate = "";
        numberPlate += letters[Helper.randomInt(0, letters.length - 1)];
        numberPlate += letters[Helper.randomInt(0, letters.length - 1)];
        numberPlate += letters[Helper.randomInt(0, letters.length - 1)];
        numberPlate += Helper.randomInt(0,9);
        numberPlate += Helper.randomInt(0,9);
        numberPlate += Helper.randomInt(0,9);
        return numberPlate;
    }

    public static String generateBrand() {
        return brands[Helper.randomInt(0, brands.length - 1)];
    }

    public static Integer generateYear() {
        return LocalDate.now().getYear() - Helper.randomInt(0, 10);
    }

    public static String generateVersion() {
        String version = "";
        version += letters[Helper.randomInt(0, letters.length - 1)];
        version += Helper.randomInt(0,9);
        return version;
    }

    public static Car generateCar() {
        String numberPlate = generateNumberPlate();
        String brand = generateBrand();
        String version = generateVersion();
        Integer year = generateYear();
        return new Car(numberPlate,brand,version,year);
    }
}