Updates the generation means of robots.txt and sitemap.xml to be based off siteconfig's website param.

backend/tests/test_sitemap_api.py

@@ -1,12 +1,38 @@
-"""Tests for sitemap API endpoints — /api/sitemap/sitemap.xml, /api/sitemap/robots.txt, /api/sitemap/regenerate."""
+"""Tests for sitemap API endpoints — /api/sitemap/sitemap.xml, /api/sitemap/robots.txt, /api/sitemap/regenerate.
+
+Note: The sitemap and robots.txt endpoints now read the site URL from
+StationConfig.website in the database (falling back to KMTN_WEBSITE_URL
+if the config is missing). These tests assume a seeded database with the
+default station config (website = 'kmountainflower.org').
+"""
 
 import pytest
 from httpx import AsyncClient
 from starlette.testclient import TestClient
 
+from app.api.sitemap import _build_base_url
 from app.main import app
 
 
+class TestBuildBaseUrl:
+    """Tests for the _build_base_url helper."""
+
+    def test_bare_domain_gets_https(self):
+        assert _build_base_url("kmountainflower.org") == "https://kmountainflower.org"
+
+    def test_domain_with_trailing_slash(self):
+        assert _build_base_url("kmountainflower.org/") == "https://kmountainflower.org"
+
+    def test_domain_with_whitespace(self):
+        assert _build_base_url("  mystation.org  ") == "https://mystation.org"
+
+    def test_already_has_https_scheme(self):
+        assert _build_base_url("https://kmountainflower.org") == "https://kmountainflower.org"
+
+    def test_already_has_http_scheme(self):
+        assert _build_base_url("http://kmountainflower.org") == "http://kmountainflower.org"
+
+
 class TestSitemapEndpoints:
     """Tests for sitemap API routes."""