public async Task ExecuteBatchRequest()
{
var listener = new DispatchingListener();
var observer = new DispatchingObserver(listener);
using (DiagnosticListener.AllListeners.Subscribe(observer))
{
// arrange
FetchDataDelegate <string, string> fetch = async keys =>
{
var error = new Exception("Quux");
return(await Task.FromResult(new[]
{
Result <string> .Reject(error)
}).ConfigureAwait(false));
};
var options = new DataLoaderOptions <string>();
var loader = new DataLoader <string, string>(options, fetch);
// act
try
{
await loader.LoadAsync("Foo").ConfigureAwait(false);
}
catch
{
}
// assert
Assert.Collection(listener.Keys,
(key) => Assert.Equal("Foo", key));
Assert.Collection(listener.Values,
(item) =>
{
Assert.Equal("Foo", item.Key);
Assert.True(item.Value.IsError);
Assert.Equal("Quux", item.Value.Error.Message);
});
Assert.Collection(listener.Errors,
(item) =>
{
Assert.Equal("Foo", item.Key);
Assert.Equal("Quux", item.Value.Message);
});
}
}
public DispatchingObserver(DispatchingListener listener)
{
_listener = listener ??
throw new ArgumentNullException(nameof(listener));
}