CustomFactAttribute.cs

using System;
using Xunit;
using Xunit.Sdk;

namespace XunitTest
{
    [AttributeUsage(AttributeTargets.Method)]
    [XunitTestCaseDiscoverer("XunitTest.Discoverer", "XunitTest")]
    public class CustomFactAttribute : FactAttribute
    {
    }
}

Discoverer.cs

using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xunit.Abstractions;
using Xunit.Sdk;

namespace XunitTest
{
    public class Discoverer : IXunitTestCaseDiscoverer
    {
        private IMessageSink messageSink;

        public Discoverer(IMessageSink messageSink)
        {
            this.messageSink = messageSink;
        }
        public IEnumerable<IXunitTestCase> Discover(ITestFrameworkDiscoveryOptions discoveryOptions, ITestMethod testMethod,
            IAttributeInfo factAttribute)
        {
            return new[] { new XunitTestCase(messageSink, discoveryOptions.MethodDisplayOrDefault(), testMethod) };
        }
    }
}

packages.config

<?xml version="1.0" encoding="utf-8"?>
<packages>
  <package id="xunit" version="2.2.0-beta1-build3239" targetFramework="portable45-net45+win8+wpa81" />
  <package id="xunit.abstractions" version="2.0.0" targetFramework="portable45-net45+win8+wpa81" />
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</packages>

TestClass.cs

using Xunit;

namespace XunitTest
{
    public class TestClass
    {
        [CustomFact]

        public void Pass()
        {
            Assert.True(true);
        }
    }


}

XunitTest.csproj

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