public function test_invalid_tags_should_be_removed_from_html_content()
 {
     $message = '<b>hello world</b><iframe src="https://example.com"></iframe><b>hello world</b>';
     $email = new BP_Email('activity-at-message');
     $email->set_content_html($message);
     $email->set_content_type('html');
     $this->assertSame('<b>hello world</b><b>hello world</b>', $email->get_content());
 }