updated tests

src/test/java/org/apache/commons/collections4/ListUtilsTest.java

@@ -121,19 +121,16 @@ public void testFindDuplicatesNoDuplicates() {
     @Test
     public void testFindDuplicatesEmptyList() {
         List<Integer> input = Arrays.asList();
-        List<Integer> expected = Arrays.asList();
-        List<Integer> actual = ListUtils.findDuplicates(input);
-        assertEquals(expected, actual, "The list should be empty as the input list is empty.");
+        assertTrue(ListUtils.findDuplicates(input).isEmpty(), "The list should be empty as the input list is empty.");
     }
 
     @Test
     public void testFindDuplicatesSingleElement() {
         List<Integer> input = Arrays.asList(1);
-        List<Integer> expected = Arrays.asList();
-        List<Integer> actual = ListUtils.findDuplicates(input);
-        assertEquals(expected, actual, "The list should be empty as there is only one element.");
+        assertTrue(ListUtils.findDuplicates(input).isEmpty(), "The list should be empty as there is only one element.");
     }
 
+
     @Test
     public void testFindDuplicatesMultipleDuplicates() {
         List<Integer> input = Arrays.asList(1, 1, 2, 2, 3, 3, 4, 4);