public async Task BasicTest()
{
var cacheDir = GetCacheDir();
if (Directory.Exists(cacheDir))
{
Directory.Delete(cacheDir, true);
}
var cache = new FileSystemCache <int, int>(cacheDir);
(await cache.TryGetAsync(1)).Should().Be(Option.None <int>());
await Assert.ThrowsAsync <KeyNotFoundException>(async() => await cache.GetAsync(1));
await cache.SetAsync(1, 1);
(await cache.TryGetAsync(1)).Should().Be(Option.Some <int>(1));
(await cache.GetAsync(1)).Should().Be(1);
(await cache.TryGetAsync(2)).Should().Be(Option.None <int>());
await Assert.ThrowsAsync <KeyNotFoundException>(async() => await cache.GetAsync(2));
await cache.InvalidateAsync(1);
(await cache.TryGetAsync(1)).Should().Be(Option.None <int>());
await Assert.ThrowsAsync <KeyNotFoundException>(async() => await cache.GetAsync(1));
}