add method retainAll

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

@@ -626,7 +626,7 @@ public class IntListTest {
 	}
 
 	@Test
-	public void replaceAllOnEmptyList() {
+	public void testReplaceAllOnEmptyList() {
 		final IntList list = new IntList();
 
 		list.replaceAll(i -> i * 3);
@@ -634,7 +634,7 @@ public class IntListTest {
 	}
 
 	@Test
-	public void removeAll() {
+	public void testRemoveAll() {
 		final IntList list = IntList.of(-2, -1, 0, 1, 2, 3, 4, 5, 6);
 		final IntList remove = IntList.of(-1, 2, 4, 5);
 
@@ -644,7 +644,7 @@ public class IntListTest {
 	}
 
 	@Test
-	public void removeEmptyList() {
+	public void testRemoveEmptyList() {
 		final IntList list = IntList.of(1, 2, 3, 4, 5, 6);
 		final IntList remove = new IntList();
 
@@ -654,7 +654,7 @@ public class IntListTest {
 	}
 
 	@Test
-	public void removeAllFromEmptyList() {
+	public void testRemoveAllFromEmptyList() {
 		final IntList list = new IntList();
 		final IntList remove = IntList.of(1);
 
@@ -662,4 +662,34 @@ public class IntListTest {
 		Assert.assertArrayEquals(new int[] {}, list.toArray());
 		Assert.assertEquals(0, list.size());
 	}
+
+	@Test
+	public void testRetainAll() {
+		final IntList list = IntList.of(-2, -1, 0, 1, 2, 3, 4, 5, 6);
+		final IntList retain = IntList.of(-1, 2, 4, 5, 99);
+
+		list.retainAll(retain);
+		Assert.assertArrayEquals(new int[] { -1, 2, 4, 5 }, list.toArray());
+		Assert.assertArrayEquals(new int[] { -1, 2, 4, 5, 99 }, retain.toArray());
+	}
+
+	@Test
+	public void testRetainAllOnEmptyList() {
+		final IntList list = IntList.of();
+		final IntList retain = IntList.of(-1, 2, 4, 5, 99);
+
+		list.retainAll(retain);
+		Assert.assertArrayEquals(new int[] {}, list.toArray());
+		Assert.assertArrayEquals(new int[] { -1, 2, 4, 5, 99 }, retain.toArray());
+	}
+
+	@Test
+	public void testRetainAllFromEmptyList() {
+		final IntList list = IntList.of(-2, -1, 0, 1, 2);
+		final IntList retain = IntList.of();
+
+		list.retainAll(retain);
+		Assert.assertArrayEquals(new int[] {}, list.toArray());
+		Assert.assertArrayEquals(new int[] {}, retain.toArray());
+	}
 }