public function testSaveDeleteContains()
{
$this->assertFalse($this->cache->contains('foo'));
$this->cache->save('foo', 'bar');
$this->assertTrue($this->cache->contains('foo'));
$this->assertEquals($this->cache->fetch('foo'), 'bar');
$this->cache->delete('foo');
$this->assertFalse($this->cache->contains('foo'));
}