public function testAddHeader()
 {
     try {
         $this->obj->addHeader();
         $this->fail();
     } catch (ExpiresHeaderException $e) {
         $this->assertSame($e->getMessage(), 'Forbidden');
         $this->assertSame($e->getCode(), 403);
     }
     $this->obj->setFilePath(TEST_IMAGE_PATH)->addHeader();
     $this->markTestIncomplete('Header test');
 }