From 77000372c6280ff3d365ff874d45cf2a5f4793a3 Mon Sep 17 00:00:00 2001
From: Stef Heyenrath <Stef.Heyenrath@gmail.com>
Date: Wed, 11 Jun 2025 11:51:29 +0200
Subject: [PATCH] Fix for WithTransformer and JsonBody as list (#1315)

* Fix for WithTransformer and JsonBody as list

* Fix WithTransformer when the response BodyAsJson is a List
---
 .../Transformers/Transformer.cs               |  5 +-
 .../WireMockServerTests.WithTransformer.cs    | 78 ++++++++++++++++++-
 2 files changed, 77 insertions(+), 6 deletions(-)

diff --git a/src/WireMock.Net.Minimal/Transformers/Transformer.cs b/src/WireMock.Net.Minimal/Transformers/Transformer.cs
index ca70c78e..000eeece 100644
--- a/src/WireMock.Net.Minimal/Transformers/Transformer.cs
+++ b/src/WireMock.Net.Minimal/Transformers/Transformer.cs
@@ -1,6 +1,7 @@
 // Copyright © WireMock.Net
 
 using System;
+using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
 using HandlebarsDotNet.Helpers.Models;
@@ -170,8 +171,8 @@ internal class Transformer : ITransformer
                 WalkNode(transformerContext, options, jToken, model);
                 break;
 
-            case Array bodyAsArray:
-                jToken = JArray.FromObject(bodyAsArray, _jsonSerializer);
+            case var bodyAsEnumerable when bodyAsEnumerable is IEnumerable and not string:
+                jToken = JArray.FromObject(bodyAsEnumerable, _jsonSerializer);
                 WalkNode(transformerContext, options, jToken, model);
                 break;
 
diff --git a/test/WireMock.Net.Tests/WireMockServerTests.WithTransformer.cs b/test/WireMock.Net.Tests/WireMockServerTests.WithTransformer.cs
index 22e94056..aaec3811 100644
--- a/test/WireMock.Net.Tests/WireMockServerTests.WithTransformer.cs
+++ b/test/WireMock.Net.Tests/WireMockServerTests.WithTransformer.cs
@@ -1,12 +1,11 @@
 // Copyright © WireMock.Net
 
 using System;
+using System.Collections.Generic;
 using System.IO;
 using System.Net.Http;
 using System.Threading.Tasks;
 using FluentAssertions;
-using WireMock.RequestBuilders;
-using WireMock.ResponseBuilders;
 using WireMock.Server;
 using Xunit;
 
@@ -44,6 +43,78 @@ public partial class WireMockServerTests
         response.Should().Contain("Hello, Stef!");
     }
 
+    [Fact]
+    public async Task WireMockServer_WithTransformer_WithJsonBodyAsArray_ShouldWork()
+    {
+        // Arrange
+        using var server = WireMockServer.Start();
+        server
+            .WhenRequest(req => req
+                .WithPath("/withbody")
+                .UsingPost()
+            )
+            .ThenRespondWith(rsp => rsp
+                .WithSuccess()
+                .WithBodyAsJson(new[]
+                    {
+                        new
+                        {
+                            test = "test",
+                            secret = true
+                        },
+                        new
+                        {
+                            test = "123",
+                            secret = false
+                        }
+                    }
+                )
+                .WithTransformer()
+            );
+
+        // Act
+        var response = await GetResponseAsync(server, "/withbody");
+
+        // Assert
+        response.Should().Be("""[{"test":"test","secret":true},{"test":"123","secret":false}]""");
+    }
+
+    [Fact]
+    public async Task WireMockServer_WithTransformer_WithJsonBodyAsList_ShouldWork()
+    {
+        // Arrange
+        using var server = WireMockServer.Start();
+        server
+            .WhenRequest(req => req
+                .WithPath("/withbody")
+                .UsingPost()
+            )
+            .ThenRespondWith(rsp => rsp
+                .WithSuccess()
+                .WithBodyAsJson(
+                    new List<object>
+                    {
+                        new
+                        {
+                            test = "test",
+                            secret = true
+                        },
+                        new
+                        {
+                            test = "123",
+                            secret = false
+                        }
+                    })
+                .WithTransformer()
+            );
+
+        // Act
+        var response = await GetResponseAsync(server, "/withbody");
+
+        // Assert
+        response.Should().Be("""[{"test":"test","secret":true},{"test":"123","secret":false}]""");
+    }
+
     [Fact]
     public async Task WireMockServer_WithTransformerBefore_WithBodyFromFile_ShouldWork()
     {
@@ -88,8 +159,7 @@ public partial class WireMockServerTests
 
     private static async Task<string> GetResponseAsync(WireMockServer server, string relativePath)
     {
-        using HttpClient httpClient = new HttpClient();
-        httpClient.BaseAddress = new Uri(server.Urls[0]);
+        using var httpClient = server.CreateClient();
 
         using var requestContent = new StringContent(RequestXml);
         using var responseMsg = await httpClient.PostAsync(relativePath, requestContent);