Reusable pathItems only exist in v31

Author: MaggieKimani1

src/Microsoft.OpenApi/Models/References/OpenApiPathItemReference.cs

@@ -91,21 +91,7 @@ public override string Description
 
         /// <inheritdoc/>
         public override IDictionary<string, IOpenApiExtension> Extensions { get => Target.Extensions; set => Target.Extensions = value; }
-        
-        /// <inheritdoc/>
-        public override void SerializeAsV3(IOpenApiWriter writer)
-        {
-            if (!writer.GetSettings().ShouldInlineReference(_reference))
-            {
-                _reference.SerializeAsV3(writer);
-                return;
-            }
-            else
-            {
-                SerializeInternal(writer, (writer, element) => element.SerializeAsV3WithoutReference(writer));
-            }
-        }
-        
+               
         /// <inheritdoc/>
         public override void SerializeAsV31(IOpenApiWriter writer)
         {
@@ -120,20 +106,6 @@ public override void SerializeAsV31(IOpenApiWriter writer)
             }
         }
 
-        /// <inheritdoc/>
-        public override void SerializeAsV2(IOpenApiWriter writer)
-        {
-            if (!writer.GetSettings().ShouldInlineReference(_reference))
-            {
-                _reference.SerializeAsV2(writer);
-                return;
-            }
-            else
-            {
-                SerializeInternal(writer, (writer, element) => element.SerializeAsV2WithoutReference(writer));
-            }
-        }
-
         /// <inheritdoc/>
         private void SerializeInternal(IOpenApiWriter writer,
             Action<IOpenApiWriter, IOpenApiReferenceable> action)

src/Microsoft.OpenApi/Reader/V3/OpenApiComponentsDeserializer.cs

@@ -28,8 +28,7 @@ internal static partial class OpenApiV3Deserializer
             {"headers", (o, n) => o.Headers = n.CreateMapWithReference(ReferenceType.Header, LoadHeader)},
             {"securitySchemes", (o, n) => o.SecuritySchemes = n.CreateMapWithReference(ReferenceType.SecurityScheme, LoadSecurityScheme)},
             {"links", (o, n) => o.Links = n.CreateMapWithReference(ReferenceType.Link, LoadLink)},
-            {"callbacks", (o, n) => o.Callbacks = n.CreateMapWithReference(ReferenceType.Callback, LoadCallback)},
-            {"pathItems", (o, n) => o.PathItems = n.CreateMapWithReference(ReferenceType.PathItem, LoadPathItem)}
+            {"callbacks", (o, n) => o.Callbacks = n.CreateMapWithReference(ReferenceType.Callback, LoadCallback)}
         };
 
         private static readonly PatternFieldMap<OpenApiComponents> _componentsPatternFields =

test/Microsoft.OpenApi.Tests/Models/References/OpenApiPathItemReferenceTests.cs

@@ -20,7 +20,7 @@ namespace Microsoft.OpenApi.Tests.Models.References
     public class OpenApiPathItemReferenceTests
     {
         private const string OpenApi = @"
-openapi: 3.0.0
+openapi: 3.1.0
 info:
   title: Sample API
   version: 1.0.0
@@ -51,7 +51,7 @@ public class OpenApiPathItemReferenceTests
 ";
 
         private const string OpenApi_2 = @"
-openapi: 3.0.0
+openapi: 3.1.0
 info:
   title: Sample API
   version: 1.0.0
@@ -104,23 +104,6 @@ public void PathItemReferenceResolutionWorks()
             Assert.Equal("User path item summary", _openApiDoc.Components.PathItems.First().Value.Summary);
         }
 
-        [Theory]
-        [InlineData(true)]
-        [InlineData(false)]
-        public async Task SerializePathItemReferenceAsV3JsonWorks(bool produceTerseOutput)
-        {
-            // Arrange
-            var outputStringWriter = new StringWriter(CultureInfo.InvariantCulture);
-            var writer = new OpenApiJsonWriter(outputStringWriter, new OpenApiJsonWriterSettings { Terse = produceTerseOutput, InlineLocalReferences = true });
-
-            // Act
-            _localPathItemReference.SerializeAsV3(writer);
-            writer.Flush();
-
-            // Assert            
-            await Verifier.Verify(outputStringWriter).UseParameters(produceTerseOutput);
-        }
-
         [Theory]
         [InlineData(true)]
         [InlineData(false)]
@@ -137,22 +120,5 @@ public async Task SerializePathItemReferenceAsV31JsonWorks(bool produceTerseOutp
             // Assert
             await Verifier.Verify(outputStringWriter).UseParameters(produceTerseOutput);
         }
-
-        [Theory]
-        [InlineData(true)]
-        [InlineData(false)]
-        public async Task SerializePathItemReferenceAsV2JsonWorksAsync(bool produceTerseOutput)
-        {
-            // Arrange
-            var outputStringWriter = new StringWriter(CultureInfo.InvariantCulture);
-            var writer = new OpenApiJsonWriter(outputStringWriter, new OpenApiJsonWriterSettings { Terse = produceTerseOutput });
-
-            // Act
-            _localPathItemReference.SerializeAsV2(writer);
-            writer.Flush();
-
-            // Assert
-            await Verifier.Verify(outputStringWriter).UseParameters(produceTerseOutput);
-        }
     }
 }