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public class App {
    public static void main(String[] args) {

        /* data to test against */
        int[][] m = {{12,12,11},{9,8,31},{2,16,24}};

        /* test to run to verify the data */
        for (int[] i : m) {
            asserts(i.length == m.length,"input 2D array is not a square");
        }
    }

    /* provides clean assert usage for cleaner debugging
     * by: CodyKochmann                               
     */
    private static void asserts(boolean test,String message){
        if(test == false){
            System.out.println("Assertion Error: " + message);
            System.exit(0);
        }
    }
}

let test = false;
assert!(test, "test wasn't true!");

i=0
assert isinstance(i,int), "i needs to be an int"

$dogs=5;
assert('isset($dogs); /* dog must be set before this is called. */');
echo $dogs;