Add local-port and public-tunnel reachability checks

internal/client/check_test.go

@@ -0,0 +1,50 @@
+package client
+
+import (
+	"context"
+	"net"
+	"testing"
+)
+
+func TestCheckLocal(t *testing.T) {
+	listener, err := net.Listen("tcp", "127.0.0.1:0")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer listener.Close()
+	go func() {
+		for {
+			conn, err := listener.Accept()
+			if err != nil {
+				return
+			}
+			conn.Close()
+		}
+	}()
+
+	ctx := context.Background()
+	if up, detail := CheckLocal(ctx, listener.Addr().String()); !up {
+		t.Errorf("listener should be up: %s", detail)
+	}
+	if up, _ := CheckLocal(ctx, "127.0.0.1:1"); up {
+		t.Error("closed port should be down")
+	}
+}
+
+func TestCheckSummary(t *testing.T) {
+	results := []RouteCheck{
+		{LocalUp: true, PublicUp: true},
+		{LocalUp: false, PublicUp: true},
+	}
+	if got := CheckSummary(results); got != "local 1/2 up · public 2/2 up" {
+		t.Errorf("summary = %q", got)
+	}
+}
+
+func TestCheckRouteMissing(t *testing.T) {
+	cfg := &Config{Routes: map[string]Route{}, Hostname: "abc.tunnel.example"}
+	result := CheckRoute(context.Background(), cfg, "missing")
+	if result.LocalUp || result.PublicUp || result.LocalError == "" {
+		t.Errorf("missing route result: %+v", result)
+	}
+}