AutoFixture performance

gistfile1.txt

using System;
using System.Diagnostics;
using Ploeh.AutoFixture;

namespace ConsoleApplication1
{
    class Program // by Roman Pushkin - roman.pushkin/at/gmail
    {
        static void Main(string[] args)
        {
            var fixture = new Fixture();
            var random = new Random();
            Test(() => fixture.Create<string>());
            Test(() => random.Next(1, 10000).ToString());
            Test(() => Guid.NewGuid().ToString());

            Console.ReadLine();
        }

        static void Test(Action action)
        {
            var watch = Stopwatch.StartNew();

            for (int i = 0; i < 50000; i++)
            {
                action();
            }

            watch.Stop();

            Console.WriteLine("Execution time: {0} ms", watch.ElapsedMilliseconds);            
        }
    }
}

Output for me:

Execution time: 947 ms
Execution time: 7 ms
Execution time: 39 ms

My tests hit a database. That's 100-500ms for each test. For me, AutoFixture is a drop in the bucket.

When you run a suite of hundreds or thousands of tests, how much percentage of time is spent in AutoFixture versus everything else? That's what I'm more concerned about - optimizing for the whole. I would only care about AutoFixture if I proved with evidence that it was my bottleneck. From your numbers, it wouldn't be by several orders of magnitude.