public void TestCache()
{
var cache = new InstanceCache();
cache.Clear();
var summary = new HtmlSummary(HttpStatusCode.OK,
"http://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html#sec4", RawHtml, "text/html");
cache.Set("first", summary);
cache.Set("second", summary);
var first = cache.Get<HtmlSummary>("first");
var second = cache.Get<HtmlSummary>("second");
first.Should().NotBeNull();
second.Should().NotBeNull();
first.CreatedAt.Should().Be(second.CreatedAt);
cache.Unset("first");
var none = cache.Get<HtmlSummary>("first");
none.Should().BeNull();
}