public void ActivityStartTimeCanBeSet()
{
DateTime?actualStartTimeUtc = null;
using var testListener = new TestDiagnosticListener("Azure.Clients");
testListener.EventCallback = _ => { actualStartTimeUtc = Activity.Current?.StartTimeUtc; };
DiagnosticScopeFactory clientDiagnostics = new DiagnosticScopeFactory("Azure.Clients", "Microsoft.Azure.Core.Cool.Tests", true, false);
DiagnosticScope scope = clientDiagnostics.CreateScope("ActivityName");
DateTime expectedStartTimeUtc = DateTime.UtcNow - TimeSpan.FromSeconds(10);
scope.SetStartTime(expectedStartTimeUtc);
scope.Start();
scope.Dispose();
Assert.AreEqual(expectedStartTimeUtc, actualStartTimeUtc);
}