Tried pre-loading the ruleset

Author: darrelmiller

test/Microsoft.OpenApi.Readers.Tests/TestCustomExtension.cs

@@ -48,7 +48,7 @@ public void ParseCustomExtension()
         }
     }
 
-    public class FooExtension : IOpenApiExtension, IOpenApiElement
+    internal class FooExtension : IOpenApiExtension, IOpenApiElement
     {
         public string Baz { get; set; }
 

test/Microsoft.OpenApi.Tests/Services/OpenApiValidatorTests.cs

@@ -4,7 +4,6 @@
 using System;
 using System.Collections.Generic;
 using FluentAssertions;
-using Microsoft.OpenApi.Exceptions;
 using Microsoft.OpenApi.Interfaces;
 using Microsoft.OpenApi.Models;
 using Microsoft.OpenApi.Properties;
@@ -132,7 +131,7 @@ public void ValidateCustomExtension()
 
     }
 
-    public class FooExtension : IOpenApiExtension, IOpenApiElement
+    internal class FooExtension : IOpenApiExtension, IOpenApiElement
     {
         public string Baz { get; set; }
 

test/Microsoft.OpenApi.Tests/Validations/ValidationRuleSetTests.cs

@@ -8,6 +8,11 @@ namespace Microsoft.OpenApi.Validations.Tests
 {
     public class ValidationRuleSetTests
     {
+        public ValidationRuleSetTests()
+        {
+            var preload = ValidationRuleSet.DefaultRuleSet;
+        }
+
         [Fact]
         public void DefaultRuleSetReturnsTheCorrectRules()
         {

test/Microsoft.OpenApi.Tests/Walkers/WalkerLocationTests.cs

@@ -1,4 +1,7 @@
-using System.Collections.Generic;
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT license. 
+
+using System.Collections.Generic;
 using FluentAssertions;
 using Microsoft.OpenApi.Models;
 using Microsoft.OpenApi.Services;
@@ -154,7 +157,7 @@ public void WalkDOMWithCycles()
         }
     }
 
-    public class LocatorVisitor : OpenApiVisitorBase
+    internal class LocatorVisitor : OpenApiVisitorBase
     {
         public List<string> Locations = new List<string>();
         public override void Visit(OpenApiInfo info)