IntList get lower bounds check now enforced, test added

Author: smarasca5

core/src/processing/data/IntList.java

@@ -6,6 +6,7 @@
 import java.util.Iterator;
 import java.util.Random;
 
+import org.jetbrains.annotations.TestOnly;
 import processing.core.PApplet;
 
 
@@ -164,13 +165,14 @@ public void clear() {
    * @webBrief Get an entry at a particular index
    */
   public int get(int index) {
-    if (index >= this.count) {
+    if (index >= this.count || index < 0) {
       throw new ArrayIndexOutOfBoundsException(index);
     }
     return data[index];
   }
 
 
+
   /**
    * Set the entry at a particular index.
    *

core/test/processing/data/IntListTest.java

@@ -151,6 +151,16 @@ public void testPopOnEmptyIntListThrowsException() {
         assertEquals("Can't call pop() on an empty list", exception.getMessage());
     }
 
+    @Test
+    public void testGetOnNegativeIndexIntListThrowsException() {
+        IntList testedList = new IntList();
+        ArrayIndexOutOfBoundsException exception = assertThrows(ArrayIndexOutOfBoundsException.class, () -> {
+            testedList.get(-1);
+        });
+
+        assertEquals("Array index out of range: -1", exception.getMessage());
+    }
+
     @Test
     public void testRemoveWithIndexGreaterThanSize() {
         IntList testedList = new IntList();