public function testClear()
{
Cache::write($this->cachedName, 'foo', 'bar');
Cache::write($this->cachedName, 'foobar', 'baz');
Cache::clear($this->cachedName);
$result = Cache::read($this->cachedName, 'foo');
$this->assertNull($result);
$result = Cache::read($this->cachedName, 'foobar');
$this->assertNull($result);
}