Fix FormUrlEncodedMatcher

test/WireMock.Net.Tests/WireMockServerTests.WithBody.cs

@@ -12,6 +12,7 @@ using WireMock.RequestBuilders;
 using WireMock.ResponseBuilders;
 using WireMock.Server;
 using WireMock.Settings;
+using WireMock.Types;
 
 namespace WireMock.Net.Tests;
 
@@ -339,7 +340,7 @@ public partial class WireMockServerTests
 #endif
 
     [Fact]
-    public async Task WireMockServer_WithBodyAsFormUrlEncoded_Using_PostAsync_And_WithFunc()
+    public async Task WireMockServer_WithBodyAsFormUrlEncoded_Using_PostAsync_And_WithFunc1()
     {
         // Arrange
         using var server = WireMockServer.Start();
@@ -364,6 +365,32 @@ public partial class WireMockServerTests
         server.Stop();
     }
 
+    [Fact]
+    public async Task WireMockServer_WithBodyAsFormUrlEncoded_Using_PostAsync_And_WithFunc2()
+    {
+        // Arrange
+        using var server = WireMockServer.Start();
+        server.Given(
+            Request.Create()
+                .UsingPost()
+                .WithPath("/foo")
+                .WithBody((IDictionary<string, WireMockList<string>>? values) => values != null && values["key1"] == "value1")
+            )
+            .RespondWith(
+                Response.Create()
+            );
+
+        // Act
+        var content = new FormUrlEncodedContent([new KeyValuePair<string, string>("key1", "value1")]);
+        var response = await new HttpClient()
+            .PostAsync($"{server.Url}/foo", content, _ct);
+
+        // Assert
+        response.StatusCode.Should().Be(HttpStatusCode.OK);
+
+        server.Stop();
+    }
+
     [Fact]
     public async Task WireMockServer_WithBodyAsFormUrlEncoded_Using_PostAsync_And_WithExactMatcher()
     {