Fix interceptor JSON casing

Fix property casing of Swagger UI interceptor function properties.
Resolves #2906.

src/Swashbuckle.AspNetCore.SwaggerUI/SwaggerUIOptions.cs

@@ -1,10 +1,10 @@
 using System;
-using System.IO;
-using System.Reflection;
 using System.Collections.Generic;
+using System.IO;
 using System.Linq;
-using System.Text.Json.Serialization;
+using System.Reflection;
 using System.Text.Json;
+using System.Text.Json.Serialization;
 
 namespace Swashbuckle.AspNetCore.SwaggerUI
 {
@@ -262,6 +262,7 @@ public class InterceptorFunctions
         /// Accepts one argument requestInterceptor(request) and must return the modified request, or a Promise that resolves to the modified request.
         /// Ex: "function (req) { req.headers['MyCustomHeader'] = 'CustomValue'; return req; }"
         /// </summary>
+        [JsonPropertyName("RequestInterceptorFunction")]
         public string RequestInterceptorFunction { get; set; }
 
         /// <summary>
@@ -270,6 +271,7 @@ public class InterceptorFunctions
         /// Accepts one argument responseInterceptor(response) and must return the modified response, or a Promise that resolves to the modified response.
         /// Ex: "function (res) { console.log(res); return res; }"
         /// </summary>
+        [JsonPropertyName("ResponseInterceptorFunction")]
         public string ResponseInterceptorFunction { get; set; }
     }
 }

test/Swashbuckle.AspNetCore.IntegrationTests/SwaggerUIIntegrationTests.cs

@@ -71,6 +71,18 @@ public async Task IndexUrl_ReturnsCustomIndexHtml_IfConfigured()
             Assert.Contains("Example.com", content);
         }
 
+        [Fact]
+        public async Task IndexUrl_ReturnsInterceptors_IfConfigured()
+        {
+            var client = new TestSite(typeof(CustomUIConfig.Startup)).BuildClient();
+
+            var response = await client.GetAsync("/swagger/index.html");
+            var content = await response.Content.ReadAsStringAsync();
+
+            Assert.Contains("\"RequestInterceptorFunction\":", content);
+            Assert.Contains("\"ResponseInterceptorFunction\":", content);
+        }
+
         [Theory]
         [InlineData("/swagger/index.html", new [] { "Version 1.0", "Version 2.0" })]
         [InlineData("/swagger/1.0/index.html", new [] { "Version 1.0" })]