I am trying to test one method from a program.

Method:

        private static int dateValidation(Scanner sc)
    {
        int date;

        do
        {
            
            System.out.println("Please enter date of birth in numbers:");
            date = sc.nextInt();
                        sc.nextLine();

            if (date < 1 || date > 31)
            {
                System.out.println("Error. Please enter an appropriate date between 1-31 inclusive.");
            }
            
        } while (date < 1 || date > 31);

        return date;
    }

And I am testing stimulated user input by doing this:

import java.io.*;

public class programTest
{
        public static void dateValidationTest()
        {
                String inputTest = "10";
                System.setIn(new ByteArrayInputStream(inputTest.getBytes()));
                assertEquals(10, program.dateValidation());

        }

}

Which gives me this error as dateValidation requires Scanner as input

programTest.java:11: error: method dateValidation in class program cannot be applied to given types;
        assertEquals(10, program.dateValidation());
                                          ^
  required: Scanner
  found: no arguments
  reason: actual and formal argument lists differ in length
1 error

However when I add inputTest into it like assertEquals(10, program.dateValidation(inputTest)), another error occurs:

programTest.java:11: error: incompatible types: String cannot be converted to Scanner
        assertEquals(10, program.dateValidation(simInput));
                                                          ^
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
1 error

I am not sure if I am even doing the testing correctly, so I was wondering what is the correct way to do this?