Fórum Multiple Tests Returning Error Message, C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

// aljodav
// http://rextester.com/users/376

namespace Rextester
{
    using P=Rextester.Program;
    public class Program
    {
        public static bool Test1(string s){
            return s.Length>=5;
        }
        public static bool Test2(string s){
            return s.Contains(' ');
        }
        public static bool Test3(string s){
            return !s.StartsWith(" ");
        }
        public static bool Test4(string s){
            return !s.EndsWith(" ");
        }
        
        /* ----------------------------------------------------------- */
        public static string Test(Predicate<string> p,string s,string m){
            if(p(s))return"";else return m;
        }
        /* ------------------------------------------------------------ */
        
        public static void Main(string[] args)
        {
            Predicate<string>[] predicates={
                P.Test1,
                P.Test2,
                P.Test3,
                P.Test4,
            };
            string[] errorMsgs={
                "① The string cannot have less than 5 characters.",
                "② The string must contain one space character at least.",
                "③ The string cannot start with a space character.",
                "④ The string cannot end with a space character.",
            };
            
            string testString=" 1y ";
            List<string> list= new List<string>();
            
            Array.ForEach(predicates,p=>list.Add(Test(p,testString,errorMsgs[list.Count])));
            
            Console.WriteLine("Error msgs ( or blank if no error ):\n");
            list.ForEach(s=>Console.WriteLine("{0,5}   {1}",s==string.Empty,s));
            
            Console.WriteLine("\nAll tests succeeded: {0}", list.TrueForAll(s=>s==string.Empty));
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,16 sec, absolute running time: 0,09 sec, cpu time: 0,09 sec, average memory usage: 16 Mb, average nr of threads: 3