From 029c2a9d64bb270cfdf089218d4a83ac17401978 Mon Sep 17 00:00:00 2001
From: nick <telpe.night@gmail.com>
Date: Wed, 14 Jan 2026 17:27:14 +0100
Subject: [PATCH] add tests for
 https://github.com/oapi-codegen/oapi-codegen/issues/2183

---
 .../communication_test.go                     | 97 +++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 internal/test/issues/client-server-communication/communication_test.go

diff --git a/internal/test/issues/client-server-communication/communication_test.go b/internal/test/issues/client-server-communication/communication_test.go
new file mode 100644
index 000000000..86ec7afa4
--- /dev/null
+++ b/internal/test/issues/client-server-communication/communication_test.go
@@ -0,0 +1,97 @@
+package client_server_communication
+
+import (
+	"net/url"
+	"reflect"
+	"testing"
+
+	"github.com/oapi-codegen/runtime"
+)
+
+func TestQueryCommunication(t *testing.T) {
+
+	type ParamDefinition struct {
+		style     string
+		explode   bool
+		paramName string
+		value     any
+	}
+
+	testCases := []struct {
+		Name      string
+		Params    []ParamDefinition
+		SpecQuery string
+	}{
+		{
+			Name: "explode=false",
+			Params: []ParamDefinition{{
+				style:     "form",
+				explode:   false,
+				paramName: "color",
+				value:     []string{"blue", "black", "brown"},
+			}},
+			// https://github.com/OAI/OpenAPI-Specification/blob/main/versions/3.0.3.md#style-examples
+			SpecQuery: "color=blue,black,brown",
+		},
+		{
+			Name: "explode=false;commas",
+			Params: []ParamDefinition{{
+				style:     "form",
+				explode:   false,
+				paramName: "search_term",
+				value:     []string{"a", "b", "c,d"},
+			}},
+			SpecQuery: "search_terms=a,b,c%2Cd",
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.Name, func(t *testing.T) {
+
+			queryValues := url.Values{}
+
+			for _, param := range tc.Params {
+
+				// following code equivalent to generated client
+				queryFrag, err := runtime.StyleParamWithLocation(param.style, param.explode, param.paramName, runtime.ParamLocationQuery, param.value)
+				if err != nil {
+					t.Fatal(err)
+				}
+				parsed, err := url.ParseQuery(queryFrag)
+				if err != nil {
+					t.Fatal(err)
+				}
+				for k, v := range parsed {
+					for _, v2 := range v {
+						queryValues.Add(k, v2)
+					}
+				}
+			}
+
+			rawQuery := queryValues.Encode()
+			t.Logf("client query: %s", rawQuery)
+			if tc.SpecQuery != "" && rawQuery != tc.SpecQuery {
+				t.Errorf("spec query: expected %q, got %q", tc.SpecQuery, rawQuery)
+			}
+
+			serverValues, err := url.ParseQuery(rawQuery)
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			// following code equivalent to generated server
+			for _, param := range tc.Params {
+
+				dest := reflect.New(reflect.TypeOf(param.value))
+				err := runtime.BindQueryParameter(param.style, param.explode, true, param.paramName, serverValues, dest.Interface())
+				if err != nil {
+					t.Error(err)
+				} else if !reflect.DeepEqual(dest.Elem().Interface(), param.value) {
+					t.Errorf("expecting %v, got %v", param.value, dest.Elem().Interface())
+				}
+
+			}
+
+		})
+	}
+}