Avoid fake IPv6 examples

tests/test_ui.py

@@ -36,7 +36,7 @@ def test_self_service_managed_hostname_generates_random_account(tmp_path: Path)
     assert "Manual updates" in response.text
     assert "curl -sS" in response.text
     assert "203.0.113.10" in response.text
-    assert "2001:db8::10" in response.text
+    assert "2001:db8::10" not in response.text
     assert "Public:" in response.text
     assert "Secret:" in response.text
     assert ".ddns.example.net" in response.text
@@ -139,6 +139,24 @@ def test_public_examples_use_cloudflare_ip_from_private_reverse_proxy(tmp_path:
     assert "myip=8.8.4.4" in created.text
 
 
+def test_pending_examples_use_real_ipv6_when_request_is_ipv6(tmp_path: Path) -> None:
+    app = make_app(
+        DdnsSettings(
+            database_path=tmp_path / "ddns.sqlite3",
+            admin_password="admin",
+            hostname_suffix="ddns.example.net",
+            public_base_url="https://karldns.de",
+        )
+    )
+    client = TestClient(app, client=("2001:4860:4860::8888", 12345))
+
+    response = client.post("/")
+
+    assert response.status_code == 200
+    assert "myipv6=2001:4860:4860::8888" in response.text
+    assert "myip=203.0.113.10" not in response.text
+
+
 def test_generated_hostname_must_be_activated_before_updates_work(tmp_path: Path) -> None:
     database_path = tmp_path / "ddns.sqlite3"
     app = make_app(