public function testCache() {
$cache = new ApcCache();
$this
->assertFalse($cache
->has('foo'));
$cache
->set('foo', 'bar');
$this
->assertEquals('bar', $cache
->get('foo'));
$this
->assertTrue($cache
->has('foo'));
$cache
->remove('foo');
$this
->assertFalse($cache
->has('foo'));
}