public class ExerciseRunner {
    public static void main(String[] args) {
        DayOfWeekFinder finder = new DayOfWeek();

        // Test case 1
        String startDate1 = "2023-06-22";
        String dayOfWeek1 = "Monday";
        System.out.println("Next " + dayOfWeek1 + " after " + startDate1 + ": " + finder.findNextDayOfWeek(startDate1, dayOfWeek1)); // Expected output: 2023-06-26

        // Test case 2
        String startDate2 = "2023-06-22";
        String dayOfWeek2 = "Friday";
        System.out.println("Next " + dayOfWeek2 + " after " + startDate2 + ": " + finder.findNextDayOfWeek(startDate2, dayOfWeek2)); // Expected output: 2023-06-23

        // Test case 3
        String startDate3 = "2023-06-22";
        String dayOfWeek3 = "Sunday";
        System.out.println("Next " + dayOfWeek3 + " after " + startDate3 + ": " + finder.findNextDayOfWeek(startDate3, dayOfWeek3)); // Expected output: 2023-06-25

        // Error case: invalid date format
        String startDate4 = "invalid-date";
        String dayOfWeek4 = "Monday";
        System.out.println("Next " + dayOfWeek4 + " after " + startDate4 + ": " + finder.findNextDayOfWeek(startDate4, dayOfWeek4)); // Expected output: Error

        // Error case: invalid day of the week
        String startDate5 = "2023-06-22";
        String dayOfWeek5 = "Funday";
        System.out.println("Next " + dayOfWeek5 + " after " + startDate5 + ": " + finder.findNextDayOfWeek(startDate5, dayOfWeek5)); // Expected output: Error
    }
}