public async Task ClearInvalidCache()
{
//Clear the cache
await DataCache.ClearAll();
var result1 = await DataCache.GetAsync("test1", () => LongRunningOperation("result1"), DateTime.Now.AddDays(-1));
var result2 = await DataCache.GetAsync("test2", () => LongRunningOperation("result2"));
await DataCache.ClearInvalid();
var result1_new = await DataCache.GetAsync("test1", () => LongRunningOperation("result1_new"));
var result2_new = await DataCache.GetAsync("test2", () => LongRunningOperation("result2_new"));
Assert.AreEqual("result1_new", result1_new); //Not from cache
Assert.AreEqual("result2", result2_new); //From cache
}