public function testRetainAll() { // Remove the following lines when you implement this test. $this->assertTrue($this->object->retainAll($list = $this->object->subList(2, 8))); $this->assertTrue($this->object->count() == 6); $this->assertTrue($this->object->get(0) == 2); $list = $this->object->subList(2, 4); $list->add(5468); $this->assertFalse($this->object->retainAll($list)); }