From 2ed09eef52d4808210a8356c7a1e94ec06bb10b2 Mon Sep 17 00:00:00 2001
From: smarasca5 <smarasca5@gmail.com>
Date: Wed, 18 Feb 2026 19:57:57 -0500
Subject: [PATCH] IntList get lower bounds check now enforced, test added

---
 core/src/processing/data/IntList.java      |  4 +++-
 core/test/processing/data/IntListTest.java | 10 ++++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/core/src/processing/data/IntList.java b/core/src/processing/data/IntList.java
index afb4c6cd61..83cac6b3f7 100644
--- a/core/src/processing/data/IntList.java
+++ b/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.
    *
diff --git a/core/test/processing/data/IntListTest.java b/core/test/processing/data/IntListTest.java
index 3c422d84e4..c98f7a675f 100644
--- a/core/test/processing/data/IntListTest.java
+++ b/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();