Your job is to design a test plan to test the following static method that converts a given NaturalNumber into a String with commas in a format similar to the one used by the method printWithCommas you implemented in a previous lab:

/**

* Converts the given {@code NaturalNumber} to a {@code String} with commas.

*

* @param n

* the number

* @return the {@code String} with commas

* @ensures toStringWithCommas = [String representation of n with commas]

*/

public static String toStringWithCommas(NaturalNumber n) {...}