/**
  * Test that we can add remove a group from the association
  *
  * @since 1.1.0
  *
  * @group group
  * @group objects
  * @group posts_object
  *
  * @covers \ingot\testing\object\posts::remove()
  */
 public function testRemove()
 {
     $groups = [5, 3, 7];
     $obj = new \ingot\testing\object\posts($this->the_post);
     $obj->add($groups);
     $obj->remove(5);
     $expected = [3, 7];
     $this->assertEquals(array_values($expected), array_values($obj->get_groups()));
     $this->assertEquals(array_values($obj->get_groups()), array_values(get_post_meta($this->the_post->ID, \ingot\testing\utility\posts::meta_key(), false)));
     $obj = new \ingot\testing\object\posts($this->the_post);
     $this->assertEquals(array_values($expected), array_values($obj->get_groups()));
 }