fix(agent): allow disabling Tailscale netns (#618)

internal/config/config_test.go

@@ -0,0 +1,44 @@
+package config
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+func loadTestConfig(t *testing.T, tailscaleNetNS string) *Config {
+	t.Helper()
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+		w.WriteHeader(http.StatusOK)
+	}))
+	t.Cleanup(server.Close)
+
+	t.Setenv(DebugEnv, "false")
+	t.Setenv(HostnameEnv, "headplane-agent")
+	t.Setenv(TSControlURLEnv, server.URL)
+	t.Setenv(TSAuthKeyEnv, "test-auth-key")
+	t.Setenv(TSNetNSEnv, tailscaleNetNS)
+	t.Setenv(WorkDirEnv, t.TempDir())
+
+	cfg, err := Load()
+	if err != nil {
+		t.Fatalf("Load() returned an error: %v", err)
+	}
+
+	return cfg
+}
+
+func TestLoadTailscaleNetNSEnabledByDefault(t *testing.T) {
+	cfg := loadTestConfig(t, "")
+	if !cfg.TSNetNS {
+		t.Fatal("TSNetNS is false, want true")
+	}
+}
+
+func TestLoadTailscaleNetNSDisabled(t *testing.T) {
+	cfg := loadTestConfig(t, "false")
+	if cfg.TSNetNS {
+		t.Fatal("TSNetNS is true, want false")
+	}
+}