in src/OpenTelemetryEngineTests/Traces/FunctionsActivityBuilderTests.cs [71:80]
public void StartActivity_DoesNotAllowDuplicates()
{
string activityName = Guid.NewGuid().ToString();
var startActivityResponse = FunctionsActivityBuilder.StartInternalActivity(activityName, "", "");
var startActivityResponse2 = FunctionsActivityBuilder.StartInternalActivity(activityName, "", "");
Assert.NotNull(startActivityResponse2);
Assert.Null(startActivityResponse2.activity);
}