test fingerprinted stylesheet package

nix/tests/module.nix

@@ -25,6 +25,9 @@ let
   };
   evaluatedConfig = evaluatedSystem.config;
   landingPage = self.packages.${system}.landing-page;
+  stylesheetHash =
+    builtins.substring 0 12 (builtins.hashFile "sha256" ../../site/styles.css);
+  stylesheetFileName = "styles-${stylesheetHash}.css";
   landingVirtualHost = evaluatedConfig.services.nginx.virtualHosts."torahimderecheretz.com";
   discourseConfig = evaluatedConfig.services.discourse;
   backupConfig = evaluatedConfig.services.borgbackup.jobs.discourse;
@@ -62,10 +65,23 @@ assert !(evaluatedConfig.services.nginx.virtualHosts ? "tide.yisroelbaum.com");
 assert !(evaluatedConfig.services.nginx.virtualHosts ? "apitide.yisroelbaum.com");
 pkgs.runCommand "tide-module-test" { } ''
   test -f ${landingPage}/index.html
-  test -f ${landingPage}/styles.css
+  test -f ${landingPage}/${stylesheetFileName}
+  test ! -e ${landingPage}/styles.css
   test -f ${landingPage}/robots.txt
   test -f ${landingPage}/assets/rav-hirsch-1847.jpg
   test -f ${landingPage}/assets/rav-hirsch-1847.webp
+  ${pkgs.diffutils}/bin/cmp \
+    ${../../site/styles.css} \
+    ${landingPage}/${stylesheetFileName}
+  ${pkgs.gnugrep}/bin/grep -F \
+    'href="/${stylesheetFileName}"' \
+    ${landingPage}/index.html
+  if ${pkgs.gnugrep}/bin/grep -F \
+    'href="/styles.css"' \
+    ${landingPage}/index.html; then
+    echo "unexpected unversioned stylesheet reference" >&2
+    exit 1
+  fi
   ${pkgs.gnugrep}/bin/grep -F \
     "A Torah vision for the whole of life." \
     ${landingPage}/index.html