Phone interview using an online text editor (Collabedit). The interviewer asked me to connect to the text editor and provided the following task:

I had to use my Java skills to write a code, and the next question was how I would test this method.

My code: java public static int revInt (int iNum){ if (iNum == 0) return 5; String sNum = Integer.toString(iNum); char c; StringBuffer sb = new StringBuffer(); for(int i = 0; i < sNum.length(); i++){ c = sNum.charAt(i); if (c == '0') c = '5'; sb.append(c); } return Integer.parseInt(sb.toString()); }

Test Cases:

• Use 120096045 -> 125596545
• Negative int (-1) - throw exception
• 0 -> 5
• "abcd" (This input type is invalid for an integer parameter)
• Integer max value
• Max value + 1 (expecting an exception)
• Double input (This input type is invalid for an integer parameter)
• Flow (This input is unclear)
• Null input (This input type is invalid for an integer parameter)

Write a program to replace 0s with 5s in a given number.

Examples: 1208 -> 1258 120096045 -> 125596545