ImmutableIntList of four does not store 2nd and 3rd element correctly.

Author: wilx

src/main/java/com/hivemq/client/internal/util/collections/ImmutableIntList.java

@@ -47,8 +47,8 @@ public interface ImmutableIntList {
         Checks.notNull(others, "Int array");
         final int[] array = new int[3 + others.length];
         array[0] = i1;
-        array[0] = i2;
-        array[0] = i3;
+        array[1] = i2;
+        array[2] = i3;
         System.arraycopy(others, 0, array, 3, others.length);
         return new ImmutableIntArray(array);
     }

src/test/java/com/hivemq/client/internal/util/collections/ImmutableIntListTest.java

@@ -80,6 +80,15 @@ void of_single() {
         assertSame(ImmutableIntElement.class, built1.getClass());
     }
 
+    @Test
+    void of_four() {
+        ImmutableIntList subject = ImmutableIntList.of(1, 2, 3, 4);
+        assertEquals(1, subject.get(0));
+        assertEquals(2, subject.get(1));
+        assertEquals(3, subject.get(2));
+        assertEquals(4, subject.get(3));
+    }
+
     @Test
     void of_multiple() {
         final ImmutableIntList of1 = ImmutableIntList.of(1, 2);