public async Task StopAsyncHappyPath()
{
var mockReceiver = new Mock <IReceiver>()
.SetupProperty(m => m.MessageHandler);
var database = new Mock <IDatabase>().Object;
var service = new ExampleService(mockReceiver.Object, database);
await service.StartAsync(CancellationToken.None);
await service.StopAsync(CancellationToken.None);
mockReceiver.Verify(m => m.Dispose(), Times.Once());
}