Fix allowReserved typo in V3 and V31 encoding deserializers and add regression tests

Co-authored-by: baywet <[email protected]>

Author: Copilot

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

@@ -44,7 +44,7 @@ internal static partial class OpenApiV3Deserializer
                 }
             },
             {
-                "allowedReserved", 
+                "allowReserved", 
                 (o, n, _) =>
                 {
                     var allowReserved = n.GetScalarValue();

src/Microsoft.OpenApi/Reader/V31/OpenApiEncodingDeserializer.cs

@@ -43,7 +43,7 @@ internal static partial class OpenApiV31Deserializer
                 }
             },
             {
-                "allowedReserved", (o, n, _) =>
+                "allowReserved", (o, n, _) =>
                 {
                     var allowReserved = n.GetScalarValue();
                     if (allowReserved is not null)

test/Microsoft.OpenApi.Readers.Tests/V31Tests/OpenApiEncodingTests.cs

@@ -0,0 +1,33 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT license.
+
+using System.IO;
+using System.Threading.Tasks;
+using Microsoft.OpenApi.Reader;
+using Xunit;
+
+namespace Microsoft.OpenApi.Readers.Tests.V31Tests
+{
+    [Collection("DefaultSettings")]
+    public class OpenApiEncodingTests
+    {
+        private const string SampleFolderPath = "V31Tests/Samples/OpenApiEncoding/";
+
+        [Fact]
+        public async Task ParseEncodingWithAllowReservedShouldSucceed()
+        {
+            // Act
+            var encoding = await OpenApiModelFactory.LoadAsync<OpenApiEncoding>(Path.Combine(SampleFolderPath, "encodingWithAllowReserved.yaml"), OpenApiSpecVersion.OpenApi3_1, new(), SettingsFixture.ReaderSettings);
+
+            // Assert
+            Assert.Equivalent(
+                new OpenApiEncoding
+                {
+                    ContentType = "application/x-www-form-urlencoded",
+                    Style = ParameterStyle.Form,
+                    Explode = true,
+                    AllowReserved = true
+                }, encoding);
+        }
+    }
+}

test/Microsoft.OpenApi.Readers.Tests/V31Tests/Samples/OpenApiEncoding/encodingWithAllowReserved.yaml

@@ -0,0 +1,5 @@
+# https://github.com/OAI/OpenAPI-Specification/blob/main/versions/3.1.0.md#encodingObject
+contentType: application/x-www-form-urlencoded
+style: form
+explode: true
+allowReserved: true

test/Microsoft.OpenApi.Readers.Tests/V3Tests/OpenApiEncodingTests.cs

@@ -55,5 +55,22 @@ public async Task ParseAdvancedEncodingShouldSucceed()
                     }
                 }, encoding);
         }
+
+        [Fact]
+        public async Task ParseEncodingWithAllowReservedShouldSucceed()
+        {
+            // Act
+            var encoding = await OpenApiModelFactory.LoadAsync<OpenApiEncoding>(Path.Combine(SampleFolderPath, "encodingWithAllowReserved.yaml"), OpenApiSpecVersion.OpenApi3_0, new(), SettingsFixture.ReaderSettings);
+
+            // Assert
+            Assert.Equivalent(
+                new OpenApiEncoding
+                {
+                    ContentType = "application/x-www-form-urlencoded",
+                    Style = ParameterStyle.Form,
+                    Explode = true,
+                    AllowReserved = true
+                }, encoding);
+        }
     }
 }

test/Microsoft.OpenApi.Readers.Tests/V3Tests/Samples/OpenApiEncoding/encodingWithAllowReserved.yaml

@@ -0,0 +1,5 @@
+# https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.0.0.md#encodingObject
+contentType: application/x-www-form-urlencoded
+style: form
+explode: true
+allowReserved: true