use sorted flag in hashcode/equals

primitiveCollections/src/test/java/org/lucares/collections/IntListTest.java

@@ -587,7 +587,29 @@ public class IntListTest {
 		Assert.assertNotEquals(list, clone);
 	}
 
-	// TODO test clone of empty list
+	@Test
+	public void testCloneEmptyList() {
+		final IntList list = new IntList();
+
+		final IntList clone = list.clone();
+		Assert.assertEquals(list, clone);
+	}
+
+	@Test
+	public void testClonePreservesSortedFlagOnUnsortedList() {
+		final IntList list = IntList.of(3, 2, 1);
+
+		final IntList clone = list.clone();
+		Assert.assertEquals(list.isSorted(), clone.isSorted());
+	}
+
+	@Test
+	public void testClonePreservesSortedFlagOnSortedList() {
+		final IntList list = IntList.of(1, 2, 3);
+
+		final IntList clone = list.clone();
+		Assert.assertEquals(list.isSorted(), clone.isSorted());
+	}
 
 	@Test
 	public void testToString() {