diff --git a/backend/cmd/server_config_test.go b/backend/cmd/server_config_test.go
new file mode 100644
index 00000000000..4d571f1638b
--- /dev/null
+++ b/backend/cmd/server_config_test.go
@@ -0,0 +1,66 @@
+/*
+Copyright 2025 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package main
+
+import (
+	"testing"
+
+	"github.com/kubernetes-sigs/headlamp/backend/pkg/config"
+	"github.com/kubernetes-sigs/headlamp/backend/pkg/kubeconfig"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestBuildHeadlampCFG(t *testing.T) {
+	store := kubeconfig.NewContextStore()
+
+	t.Run("maps basic fields and splits proxy urls", func(t *testing.T) {
+		conf := &config.Config{
+			Port:                   4444,
+			InCluster:              true,
+			InClusterContextName:   "test-incluster",
+			InsecureSsl:            true,
+			PluginsDir:             "/plugins",
+			UserPluginsDir:         "/user-plugins",
+			AllowKubeconfigChanges: true,
+			WatchPluginsChanges:    false,
+			BaseURL:                "/headlamp",
+			ProxyURLs:              "http://proxy1,http://proxy2",
+		}
+
+		headlampCFG := buildHeadlampCFG(conf, store)
+
+		assert.Equal(t, uint(4444), headlampCFG.Port)
+		assert.True(t, headlampCFG.UseInCluster)
+		assert.Equal(t, "test-incluster", headlampCFG.InClusterContextName)
+		assert.True(t, headlampCFG.Insecure)
+		assert.Equal(t, "/plugins", headlampCFG.PluginDir)
+		assert.Equal(t, "/user-plugins", headlampCFG.UserPluginDir)
+		assert.True(t, headlampCFG.AllowKubeconfigChanges)
+		assert.False(t, headlampCFG.WatchPluginsChanges)
+		assert.Equal(t, "/headlamp", headlampCFG.BaseURL)
+		assert.Equal(t, []string{"http://proxy1", "http://proxy2"}, headlampCFG.ProxyURLs)
+		assert.Equal(t, store, headlampCFG.KubeConfigStore)
+	})
+
+	t.Run("empty proxy urls yields empty slice", func(t *testing.T) {
+		conf := &config.Config{ProxyURLs: ""}
+
+		headlampCFG := buildHeadlampCFG(conf, store)
+
+		assert.Empty(t, headlampCFG.ProxyURLs)
+	})
+}