Add tests:

alexeyzimarev · alexeyzimarev · commit 9a547200ec7a · 2025-11-20T15:42:05.000+01:00
- Multiple query parameters with the same name
- Query parameters with non-string values
diff --git a/src/RestSharp/Request/RestRequestExtensions.Query.cs b/src/RestSharp/Request/RestRequestExtensions.Query.cs
@@ -26,7 +26,7 @@ public static partial class RestRequestExtensions {
         /// <param name="encode">Encode the value or not, default true</param>
         /// <returns></returns>
         public RestRequest AddQueryParameter(string name, string? value, bool encode = true)
-            => request.AddOrUpdateParameter(new QueryParameter(name, value, encode));
+            => request.AddParameter(new QueryParameter(name, value, encode));
 
         /// <summary>
         /// Adds a query string parameter to the request. The request resource should not contain any placeholders for this parameter.
diff --git a/test/RestSharp.Tests/UrlBuilderTests.Get.cs b/test/RestSharp.Tests/UrlBuilderTests.Get.cs
@@ -198,4 +198,30 @@ public void GET_wth_trailing_slash_and_query_parameters() {
         var output = client.BuildUri(request);
         Assert.Equal(expected, output);
     }
+
+    [Fact]
+    public void Multiple_query_parameters_with_same_name() {
+        var request = new RestRequest($"/{Resource}/")
+            .AddQueryParameter("foo", "bar")
+            .AddQueryParameter("foo", "baz");
+        var expected = new Uri($"{Base}/{Resource}/?foo=bar&foo=baz");
+
+        using var client = new RestClient(Base);
+
+        var output = client.BuildUri(request);
+        Assert.Equal(expected, output);
+    }
+
+    [Fact]
+    public void Query_parameter_with_non_string_value() {
+        var request = new RestRequest($"/{Resource}/")
+            .AddQueryParameter("foo", 123)
+            .AddQueryParameter("bar", true);
+        var expected = new Uri($"{Base}/{Resource}/?foo=123&bar=True");
+
+        using var client = new RestClient(Base);
+
+        var output = client.BuildUri(request);
+        Assert.Equal(expected, output);
+    }
 }
