feat: adds deserialization of the example extension

Signed-off-by: Vincent Biret <vibiret@microsoft.com>

Author: baywet

src/Microsoft.OpenApi/Reader/V2/OpenApiSchemaDeserializer.cs

@@ -267,6 +267,10 @@ internal static partial class OpenApiV2Deserializer
                 "example",
                 (o, n, _, _) => o.Example = n
             },
+            {
+                OpenApiConstants.JsonSchemaExamplesExtension,
+                (o, n, _, c) => o.Examples = n.CreateListOfAny(c)
+            },
             {
                 OpenApiConstants.PatternPropertiesExtension,
                 (o, n, t, c) => o.PatternProperties = n.CreateMap(LoadSchema, t, c)

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

@@ -280,6 +280,10 @@ internal static partial class OpenApiV3Deserializer
                 "example",
                 (o, n, _, _) => o.Example = n
             },
+            {
+                OpenApiConstants.JsonSchemaExamplesExtension,
+                (o, n, _, c) => o.Examples = n.CreateListOfAny(c)
+            },
             {
                 "deprecated",
                 (o, n, _, _) =>

test/Microsoft.OpenApi.Tests/Models/OpenApiSchemaTests.cs

@@ -1920,6 +1920,76 @@ public void DeserializePatternPropertiesExtensionInV3AssignsPatternPropertiesPro
             Assert.True(schema.Extensions is null || !schema.Extensions.ContainsKey("x-jsonschema-patternProperties"));
         }
 
+        [Fact]
+        public void DeserializeExamplesExtensionInV2AssignsExamplesProperty()
+        {
+            var jsonContent = """
+            {
+              "swagger": "2.0",
+              "info": { "title": "Test", "version": "1.0" },
+              "paths": {},
+              "definitions": {
+                "TestSchema": {
+                  "type": "string",
+                  "example": "primary example",
+                  "x-jsonschema-examples": [
+                    "secondary example",
+                    42
+                  ]
+                }
+              }
+            }
+            """;
+
+            var readResult = OpenApiDocument.Parse(jsonContent, "json");
+
+            Assert.Empty(readResult.Diagnostic.Errors);
+            var schema = readResult.Document.Components.Schemas["TestSchema"];
+            Assert.Equal("primary example", schema.Example?.GetValue<string>());
+            Assert.NotNull(schema.Examples);
+            Assert.Collection(
+                schema.Examples,
+                example => Assert.Equal("secondary example", example.GetValue<string>()),
+                example => Assert.Equal(42, example.GetValue<int>()));
+            Assert.True(schema.Extensions is null || !schema.Extensions.ContainsKey(OpenApiConstants.JsonSchemaExamplesExtension));
+        }
+
+        [Fact]
+        public void DeserializeExamplesExtensionInV3AssignsExamplesProperty()
+        {
+            var jsonContent = """
+            {
+              "openapi": "3.0.0",
+              "info": { "title": "Test", "version": "1.0" },
+              "paths": {},
+              "components": {
+                "schemas": {
+                  "TestSchema": {
+                    "type": "string",
+                    "example": "primary example",
+                    "x-jsonschema-examples": [
+                      "secondary example",
+                      42
+                    ]
+                  }
+                }
+              }
+            }
+            """;
+
+            var readResult = OpenApiDocument.Parse(jsonContent, "json");
+
+            Assert.Empty(readResult.Diagnostic.Errors);
+            var schema = readResult.Document.Components.Schemas["TestSchema"];
+            Assert.Equal("primary example", schema.Example?.GetValue<string>());
+            Assert.NotNull(schema.Examples);
+            Assert.Collection(
+                schema.Examples,
+                example => Assert.Equal("secondary example", example.GetValue<string>()),
+                example => Assert.Equal(42, example.GetValue<int>()));
+            Assert.True(schema.Extensions is null || !schema.Extensions.ContainsKey(OpenApiConstants.JsonSchemaExamplesExtension));
+        }
+
         [Fact]
         public void DeserializeContainsExtensionsInV3AssignsContainsProperties()
         {