I have a program that is generating pseudo random numbers(Only lowercase, uppercase and digits are allowed).
/**
*
* @return - returns a random digit (from 0 to 9)
*
*/
int randomDigits() {
return (int) (Math.random() * 10);
}
/**
*
* @return - returns a random lowercase (from "a" to "z")
*/
char randomLowerCase() {
return (char) ('a' + Math.random() * 26);
}
/**
*
* @return - returns a random uppercase (from "A" to "Z")
*/
char randomUpperCase() {
return (char) ('A' + Math.random() * 26);
}
/**
*
* @return - returns a random number between 1 and 3.
*
*/
char randomChoice() {
return (char) ((char) (Math.random() * 3) + 1);
}
/**
*
* @param length
* - the length of the random string.
* @return - returns a combined random string. All elements are builder side
* by side.
*
* We use the randomChoice method to get randomly upper, lower and
* digits.
*/
public String stringBuilder(int length) {
StringBuilder result = new StringBuilder();
int len = length;
for (int i = 0; i < len; i++) {
int ch = randomChoice();
if (ch == 1) {
result.append(randomDigits());
}
if (ch == 2) {
result.append(randomLowerCase());
}
if (ch == 3) {
result.append(randomUpperCase());
}
}
return result.toString();
}
How can i make a test for that code. I try to test the range for the digits (form 0 to 9)
int minRange = 0;
int maxRange = 0;
for (int i = 0; i < 100000; i++) {
int result = item.randomDigits();
if (result == 52) {
minRange++;
} else {
if (result == 19) {
maxRange++;
}
}
}
LOGGER.info("The min range in the digit is 0, and in the test appeared: {}", minRange);
LOGGER.info("The max range in the digit is 9, and in the test appeared: {}", maxRange);
But i cant find how to test the lower or upper?