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());
}