public function testUpdateStorage()
 {
     $a = ['name' => 'Newerlands peso', 'iso_code' => 'NPS', 'is_main' => 1, 'format_string' => '# pps.', 'intl_formatting' => 0];
     $c = new Currency();
     $c->setDefaults();
     $c->setAttributes($a);
     FunctionalHelper::flushStorage($c->getStorage());
     CurrencyStorageHelper::updateStorage($c);
     $this->assertFileExists($c->getStorage());
     $curr = [];
     if (true === file_exists($c->getStorage())) {
         $curr = (include $c->getStorage());
     }
     $this->assertNotEmpty($curr);
     $this->assertCount(1, $curr);
     $this->assertArrayHasKey($a['name'], $curr);
     FunctionalHelper::flushStorage($c->getStorage());
 }