Fix ConfigCompatibilityValidatorTests on Linux

Author: AndreyAkinshin

tests/BenchmarkDotNet.Tests/KnownIssue.cs

@@ -0,0 +1,20 @@
+namespace BenchmarkDotNet.Tests
+{
+    public class KnownIssue
+    {
+        public static KnownIssue Issue2299 => new (2299, "Non-supported Mono on Linux", false);
+
+        public int Number { get; }
+        public string Description { get; }
+        public bool IsFixed { get; }
+
+        public KnownIssue(int number, string description, bool isFixed)
+        {
+            Number = number;
+            Description = description;
+            IsFixed = isFixed;
+        }
+
+        public string IgnoreMessage => $"This test is ignored because of the issue #{Number} '{Description}'";
+    }
+}

tests/BenchmarkDotNet.Tests/Validators/ConfigCompatibilityValidatorTests.cs

@@ -6,8 +6,8 @@
 using BenchmarkDotNet.Reports;
 using BenchmarkDotNet.Tests.Loggers;
 using BenchmarkDotNet.Validators;
-using System.Collections.Generic;
 using System.Linq;
+using BenchmarkDotNet.Portability;
 using Xunit;
 using Xunit.Abstractions;
 
@@ -22,6 +22,12 @@ public class ConfigCompatibilityValidatorTests
         [Fact]
         public void RunningBenchmarksWithIncompatibleConfigsMustFailWithCriticalError()
         {
+            if (!KnownIssue.Issue2299.IsFixed && RuntimeInformation.IsMono && RuntimeInformation.IsLinux())
+            {
+                Output.WriteLine(KnownIssue.Issue2299.IgnoreMessage);
+                return;
+            }
+
             var logger = new OutputLogger(Output);
             var config = ManualConfig.CreateEmpty().AddLogger(logger);
             var summary =