use sorted flag in hashcode/equals

primitiveCollections/src/main/java/org/lucares/collections/IntList.java

@@ -645,10 +645,14 @@ public final class IntList implements Serializable, Cloneable {
 
 	@Override
 	public int hashCode() {
+
 		if (size == 0) {
 			return 0;
 		}
 
+		/*
+		 * only consider values in the range of 0 to size
+		 */
 		int result = 1;
 		for (int i = 0; i < size; i++) {
 			result = 31 * result + data[i];
@@ -672,7 +676,13 @@ public final class IntList implements Serializable, Cloneable {
 		if (size != other.size) {
 			return false;
 		}
+		if (sorted != other.sorted) {
+			return false;
+		}
 
+		/*
+		 * only consider values in the range of 0 to size
+		 */
 		for (int i = 0; i < size; i++) {
 			if (data[i] != other.data[i]) {
 				return false;

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() {