diff --git a/tests/generated.nix b/tests/generated.nix
index 626a89f7..f04ba941 100644
--- a/tests/generated.nix
+++ b/tests/generated.nix
@@ -21,6 +21,8 @@ let
       declared,
       # A list of names generated by generate-files
       generated,
+      # A list of names that are explicitly unsupported upstream
+      unsupported ? [ ],
       # The filename where names are declared (used in error messages)
       declarationFile,
     }:
@@ -29,11 +31,14 @@ let
         loc: lib.optional (!lib.hasAttrByPath loc pkgs) (lib.concatStringsSep "." loc)
       ) (builtins.map lib.toList packages);
       undeclared = lib.filter (name: !(lib.elem name declared)) generated;
-      uselesslyDeclared = lib.filter (name: !(lib.elem name generated)) declared;
+      uselesslyDeclared = lib.partition (name: lib.elem name unsupported) (
+        lib.filter (name: !(lib.elem name generated)) declared
+      );
     in
     describeErrors "${name}: The following are not found in `pkgs`, but are declared in ${declarationFile}:" missingFromPkgs
     ++ describeErrors "${name}: The following are not declared in ${declarationFile}:" undeclared
-    ++ describeErrors "${name}: The following are not listed upstream, but are declared in ${declarationFile}:" uselesslyDeclared;
+    ++ describeErrors "${name}: The following are now unsupported upstream, but are declared in ${declarationFile}:" uselesslyDeclared.right
+    ++ describeErrors "${name}: The following are not listed upstream, but are declared in ${declarationFile}:" uselesslyDeclared.wrong;
 
   # The error message provided to the derivation.
   # The test fails if this is non-empty.
@@ -50,11 +55,8 @@ let
 
         declared = unpackaged ++ lib.attrsets.attrNames (packages // customCmd);
 
-        generated = lib.pipe ../generated/lspconfig-servers.json [
-          lib.importJSON
-          (builtins.map (lib.getAttr "name"))
-          lib.lists.unique
-        ];
+        generated = builtins.attrNames (lib.importJSON ../generated/lspconfig-servers.json);
+        unsupported = lib.importJSON ../generated/unsupported-lspconfig-servers.json;
       }
     )
     ++ checkDeclarations (