/**
* Caching method tests
*/
public function testCaching()
{
$cache = Currency\Currency::getCache();
$this->assertTrue($cache instanceof CacheAdapter);
$this->assertTrue(Currency\Currency::hasCache());
Currency\Currency::clearCache();
$this->assertTrue(Currency\Currency::hasCache());
Currency\Currency::removeCache();
$this->assertFalse(Currency\Currency::hasCache());
}