public async Task GetGreetings()
{
var greetings = await service.GetGreetingsAsync(DateTime.MinValue);
Assert.IsNotNull(greetings);
Assert.IsTrue(greetings.LastUpdated < DateTime.Now + TimeSpan.FromMinutes(1), $"LastUpdated: {greetings.LastUpdated}, Time: {DateTime.Now}");
Assert.IsTrue(greetings.LastUpdated > DateTime.MinValue);
}