Program.cs

using System;
using SingletonExample;
using System.Collections.Generic;

public class Program
{
    public static void Main()
    {
            var s1 = Singleton.Instance;
            var s2 = Singleton.Instance;
            Assert.Equal(s1, s2);

            TestRunner.Print();
    }
}

SingletonImpl.cs

using System;
namespace SingletonExample {
    public sealed class Singleton {
        private static readonly Lazy<Singleton>
            lazy = new Lazy<Singleton> (() => new Singleton ());

        public static Singleton Instance { get { return lazy.Value; } }

        private Singleton () { }
    }
}

XUnit.Utils.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.CompilerServices;

public static class Assert {
    public static void Equal<T> (T a, T b, [CallerMemberName] string callerName = "", [CallerLineNumber] int callerLine = 0) {
        if (!a.Equals (b)) {
            // throw new Exception ($"{a} doesn't equal to {b}");
            TestRunner.AddResult (
                new TestRunResult () {
                    CallerName = callerName,
                        CallerLine = callerLine.ToString (),
                        Success = false,
                        Assertion = "Equal<T>",
                        ErrorMessage = $"{a} doesn't equal to {b}"
                });
        } else {
            TestRunner.AddResult (
                new TestRunResult () {
                    CallerName = callerName,
                        CallerLine = callerLine.ToString (),
                        Success = true,
                        Assertion = "Single<T>"
                });
        }
    }

    public static void Equal<T> (IEnumerable<T> a,
        IEnumerable<T> b, [CallerMemberName] string callerName = "", [CallerLineNumber] int callerLine = 0) {
        if (a.Count () != b.Count ()) {
            TestRunner.AddResult (
                new TestRunResult () {
                    CallerName = callerName,
                        CallerLine = callerLine.ToString (),
                        Success = false,
                        Assertion = "Equal<T>",
                        ErrorMessage = $"a.{a.Count()} != b.{b.Count()}"
                });
        } else if (!a.SequenceEqual (b)) {
            TestRunner.AddResult (
                new TestRunResult () {
                    CallerName = callerName,
                        CallerLine = callerLine.ToString (),
                        Success = false,
                        Assertion = "SequenceEqual<T>",
                        ErrorMessage = $"Different sequences"
                });
        } else {
            TestRunner.AddResult (
                new TestRunResult () {
                    CallerName = callerName,
                        CallerLine = callerLine.ToString (),
                        Success = true,
                        Assertion = "Equal<T>"
                });
        }
    }

    public static void Single<T> (IEnumerable<T> collection, [CallerMemberName] string callerName = "", [CallerLineNumber] int callerLine = 0) {
        if (collection.Count () != 1) {
            // throw new Exception ("Collection doesn't contain 1 element");
            TestRunner.AddResult (
                new TestRunResult () {
                    CallerName = callerName,
                        CallerLine = callerLine.ToString (),
                        Success = false,
                        Assertion = "Single<T>",
                        ErrorMessage = "Collection doesn't contain 1 element"
                });
        }
        TestRunner.AddResult (
            new TestRunResult () {
                CallerName = callerName,
                    CallerLine = callerLine.ToString (),
                    Success = true,
                    Assertion = "Single<T>"
            });
    }

    public static void Contains<T> (T token1, T token2, [CallerMemberName] string callerName = "", [CallerLineNumber] int callerLine = 0) {
        if (typeof (T) == typeof (System.String)) {
            if (!((token2 as string)).Contains (token1 as string)) {
                // throw new Exception ($"{token2} doesn't contain {token1}");
                TestRunner.AddResult (
                    new TestRunResult () {
                        CallerName = callerName,
                            CallerLine = callerLine.ToString (),
                            Success = false,
                            Assertion = "Contains<T>",
                            ErrorMessage = $"{token2} doesn't contain {token1}"
                    });
            } else {
                TestRunner.AddResult (
                    new TestRunResult () {
                        CallerName = callerName,
                            CallerLine = callerLine.ToString (),
                            Success = true,
                            Assertion = "Contains<T>"
                    });
            }
        } else {
            throw new Exception ("It is not possible to use .Contains() method");
        }
    }

    public static void All<T> (IEnumerable<T> collection, Func<T, bool> predicate, [CallerMemberName] string callerName = "", [CallerLineNumber] int callerLine = 0) {
        bool res = collection.All (predicate);
        var tr = new TestRunResult () {
                CallerName = callerName,
                    CallerLine = callerLine.ToString (),
                    Success = res,
                    Assertion = "All<T>"
            };
        TestRunner.AddResult (tr);
        if(!res) {
            tr.ErrorMessage = "Condition is not met for all members";
        }
    }

}

public static class TestRunner {
    public static List<TestRunResult> Results { get; } = new List<TestRunResult> ();

    public static void AddResult (TestRunResult res) {
        Results.Add (res);
    }

    public static void Print () {
        System.Console.WriteLine ("TestRunner.Print");
        System.Console.WriteLine ("============================================");
        foreach (var log in Results) {
            System.Console.WriteLine (log);
        }
        System.Console.WriteLine ("============================================");
    }
}

public class TestRunResult {
    public string CallerName { get; set; }
    public string CallerLine { get; set; }
    public string Assertion { get; set; }
    public bool Success { get; set; }
    public string ErrorMessage { get; set; }
    public override string ToString () {
        return $"Assertion: {Assertion, 15}; MethodName: {CallerName, 10}; Line: {CallerLine, 3}; " + (Success? $"Success: {Success}": $"ErrorMessage: {ErrorMessage}");
    }
}