我的代码失败，但我不知道原因

Question

/**
 * Checks whether a given value is in a given range defined by its lowest and highest possible value
 * Both of the borders of the range (lowestPossible, highestPossible) are considered to be inside of the range
 * An IllegalArgumentException is thrown if the highestPossible value is less than the lowestPossible value
 * @param lowestPossible The lowest possible value of the range
 * @param highestPossible The highest possible value of the range
 * @param guess The value that has been guessed
 * @return <code>true</code> if the guess is withing the given range; <code>false</code> otherwise
 */
public static boolean isWithinBorders(int lowestPossible, int highestPossible, int guess) {
   // return false; // TODO: IMPLEMENT ME (AND DELETE THIS COMMENT AFTERWARDS!!!)

When I run the test, I get zero errors, but I also get one failure. What could be the reaseon for the failure? I don´t get any error informations in my console or next to my code on the left side shown:(

My Code:

    if (guess > lowestPossible & guess < highestPossible) { //is value guess between highest & lowest number?
        //if (lowestPossible < highestPossible && highestPossible > lowestPossible) {  //
        return true;
            
    }else if(highestPossible < lowestPossible) {
        throw new IllegalArgumentException("lowestPossible can´t be higher then highestPossible");
            
    }else {
        return false;
    }
}

Answer 1

1. The arguments highest and lowest should be validated first
2. There is a requirement that lowest and highest are within the range [lowest, highest] , while existing code excludes these values (lowest, highest)
3. & is a bitwise operator, && should be used as logical AND operator
4. The last return is redundant

Thus, the correct code may look like:

public static boolean isWithinBorders(int lowest, int highest, int guess) {
    if (highest < lowest) {
        throw new IllegalArgumentException("Lowest must be less than highest");
    }
    return lowest <= guess && guess <= highest;
}