Write this java program and create a JUnit test class for it:

Replace the _individual_ digits in the current string, between startPosition and endPosition (included), with the corresponding Roman numeral symbol(s). The first character in the string is considered to be in Position 1. Digits are converted individually, even if contiguous, and digit "0" is not converted (e.g., 460 is converted to IVVI0).

* @param startPosition first character to consider

* @param endPosition last character to consider

* @throws MyIndexOutOfBoundsException

If either "startPosition" or "endPosition" are out of bounds (i.e., either less than 1 or greater then the length of the string)

* @throws IllegalArgumentException

If "startPosition" > "endPosition" (both in bounds)

void convertDigitsToRomanNumeralsInSubstring(int startPosition, int endPosition) throws MyIndexOutOfBoundsException, IllegalArgumentException;