/**
* @covers WPSEO_Frontend::publisher
*/
public function test_publisher()
{
// no publisher set
$this->assertFalse(self::$class_instance->publisher());
// set publisher option
self::$class_instance->options['plus-publisher'] = 'https://plus.google.com/+JoostdeValk';
// publisher set, should echo
$expected = '<link rel="publisher" href="' . esc_url(self::$class_instance->options['plus-publisher']) . '"/>' . "\n";
$this->assertTrue(self::$class_instance->publisher());
$this->expectOutput($expected);
}