public void OperationFailure_CorrectEventContent()
{
var source = new DiagnosticListener("Autofac");
var subscriber = new MockSubscriber();
subscriber.Enable(DiagnosticEventKeys.OperationFailure);
source.Subscribe(subscriber, subscriber.IsEnabled);
var operation = MockResolveOperation();
source.OperationFailure(operation, new DivideByZeroException());
var e = Assert.Single(subscriber.Events);
Assert.Equal(DiagnosticEventKeys.OperationFailure, e.Key);
Assert.IsType <OperationFailureDiagnosticData>(e.Value);
}