Fix broken tests

Author: darrelmiller

test/Microsoft.OpenApi.Tests/PublicApi/PublicApi.approved.txt

@@ -1154,7 +1154,6 @@ namespace Microsoft.OpenApi.Validations.Rules
     {
         public static Microsoft.OpenApi.Validations.ValidationRule<Microsoft.OpenApi.Models.OpenApiLicense> LicenseRequiredFields { get; }
     }
-    [Microsoft.OpenApi.Validations.Rules.OpenApiRule]
     public static class OpenApiMediaTypeRules
     {
         public static Microsoft.OpenApi.Validations.ValidationRule<Microsoft.OpenApi.Models.OpenApiMediaType> MediaTypeMismatchedDataType { get; }

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

@@ -32,7 +32,9 @@ public void ValidateExampleShouldNotHaveDataTypeMismatchForSimpleSchema()
             };
 
             // Act
-            var validator = new OpenApiValidator(ValidationRuleSet.GetDefaultRuleSet());
+            var ruleset = ValidationRuleSet.GetDefaultRuleSet();
+            ruleset.Add(OpenApiMediaTypeRules.MediaTypeMismatchedDataType);
+            var validator = new OpenApiValidator(ruleset);
             var walker = new OpenApiWalker(validator);
             walker.Walk(mediaType);
 
@@ -102,7 +104,9 @@ public void ValidateExamplesShouldNotHaveDataTypeMismatchForSimpleSchema()
             };
 
             // Act
-            var validator = new OpenApiValidator(ValidationRuleSet.GetDefaultRuleSet());
+            var ruleset = ValidationRuleSet.GetDefaultRuleSet();
+            ruleset.Add(OpenApiMediaTypeRules.MediaTypeMismatchedDataType);
+            var validator = new OpenApiValidator(ruleset);
             var walker = new OpenApiWalker(validator);
             walker.Walk(mediaType);
 

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

@@ -43,7 +43,7 @@ public void DefaultRuleSetPropertyReturnsTheCorrectRules()
             Assert.NotEmpty(rules);
 
             // Update the number if you add new default rule(s).
-            Assert.Equal(21, rules.Count);
+            Assert.Equal(20, rules.Count);
         }
     }
 }