Update BinarySearcherTests.java

tests/edu/caltech/cs2/lab03/BinarySearcherTests.java

@@ -47,7 +47,7 @@ public class BinarySearcherTests {
             int trial = 0;
             while (trial < TRIALS) {
                 // Generate a random array of a random length
-                int[] arr = generateRandomSortedArray(r, r.nextInt());
+                int[] arr = generateRandomSortedArray(r, Math.abs(r.nextInt()));
 
                 // We want to test both elements that are in the array and not in the array
                 // So, run through all the elements in the array, and for each one test both