public async void ShouldResolveOnceAsync()
{
var resolverMock = new Mock <IHostResolver>();
var resolver = new CachingHostResolver(resolverMock.Object, 5000);
await resolver.ResolveAsync("localhost");
await resolver.ResolveAsync("localhost");
resolverMock.Verify(x => x.ResolveAsync("localhost"), Times.Once);
}
public async void ShouldExpireCachedAsync()
{
var resolverMock = new Mock <IHostResolver>();
var resolver = new CachingHostResolver(resolverMock.Object, 1000);
await resolver.ResolveAsync("localhost");
await Task.Delay(1500);
await resolver.ResolveAsync("localhost");
resolverMock.Verify(x => x.ResolveAsync("localhost"), Times.Exactly(2));
}