Lsp test helpers (#88)

thomasjm · web-flow · commit 5edfeafd4177 · 2026-01-14T00:52:53.000-08:00
* Working on moving LSP test code out to lsp-test-helpers noci

* Fill in language_id for LSP configs

* More progress switching to lsp-test-helpers

* Rename basic-path

* ci: don't run on PR
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
@@ -1,7 +1,6 @@
 name: codedown-languages
 
 on:
-  pull_request:
   push:
   workflow_dispatch:
 
diff --git a/modules/kernels/bash/language_server_bash/default.nix b/modules/kernels/bash/language_server_bash/default.nix
@@ -48,4 +48,5 @@ common.writeTextDirWithMetaAndPassthru bashLanguageServerWithMan.meta passthru "
     "${bashLanguageServerWithMan}/bin/bash-language-server"
     "start"
   ];
+  language_id = "shellscript";
 }])
diff --git a/modules/kernels/clojure/language-server.nix b/modules/kernels/clojure/language-server.nix
@@ -30,4 +30,5 @@ common.writeTextDirWithMetaAndPassthru clojure-lsp.meta passthru "lib/codedown/l
   type = "stream";
   args = ["${clojure-lsp}/bin/clojure-lsp"];
   env = {};
+  language_id = "clojure";
 }])
diff --git a/modules/kernels/cpp/language_server_clangd/default.nix b/modules/kernels/cpp/language_server_clangd/default.nix
@@ -29,4 +29,5 @@ common.writeTextDirWithMetaAndPassthru clangd.meta passthru "lib/codedown/langua
   args = [
     "${clangd}/bin/clangd"
   ];
+  language_id = "cpp";
 }])
diff --git a/modules/kernels/go/language-server-gopls.nix b/modules/kernels/go/language-server-gopls.nix
@@ -45,6 +45,7 @@ common.writeTextDirWithMetaAndPassthru gopls.meta passthru "lib/codedown/languag
   type = "stream";
   args = ["${goplsWrapped}/bin/gopls"];
   env = {};
+  language_id = "go";
 }])
 
 
diff --git a/modules/kernels/haskell/language-server-hls/config.nix b/modules/kernels/haskell/language-server-hls/config.nix
@@ -81,6 +81,8 @@ let
         # checkParents = "CheckOnSave";
       };
     };
+
+    language_id = "haskell";
   };
 
 in
diff --git a/modules/kernels/python/language_servers/language_server_flake8/config.nix b/modules/kernels/python/language_servers/language_server_flake8/config.nix
@@ -81,4 +81,5 @@ common.writeTextDirWithMetaAndPassthru python.pkgs.flake8.meta passthru "lib/cod
       formatters = {};
       formatFiletypes = {};
     };
+    language_id = "python";
   }])
diff --git a/modules/kernels/python/language_servers/language_server_jedi/config.nix b/modules/kernels/python/language_servers/language_server_jedi/config.nix
@@ -40,4 +40,5 @@ common.writeTextDirWithMetaAndPassthru jls.meta passthru "lib/codedown/language-
       "/home/user/.local/${pythonEnv.sitePackages}"
     ];
   };
+  language_id = "python";
 }])
diff --git a/modules/kernels/python/language_servers/language_server_microsoft/config.nix b/modules/kernels/python/language_servers/language_server_microsoft/config.nix
@@ -88,4 +88,5 @@ common.writeTextDirWithMetaAndPassthru python-language-server.meta passthru "lib
     initialization_options = overrideExisting initialization_options {
       # cacheFolderPath = "${cache}/cache";
     };
+    language_id = "python";
   }])
diff --git a/modules/kernels/python/language_servers/language_server_palantir/config.nix b/modules/kernels/python/language_servers/language_server_palantir/config.nix
@@ -61,4 +61,5 @@ common.writeTextDirWithMetaAndPassthru python.pkgs.python-language-server.meta p
     type = "stream";
     args = ["${python}/bin/python" "-m" "pyls"];
     initialization_options = import ../pylsp_initialization_options.nix "pyls";
+    language_id = "python";
   }])
diff --git a/modules/kernels/python/language_servers/language_server_pycodestyle/config.nix b/modules/kernels/python/language_servers/language_server_pycodestyle/config.nix
@@ -80,4 +80,5 @@ common.writeTextDirWithMetaAndPassthru python.pkgs.pycodestyle.meta passthru "li
       formatters = {};
       formatFiletypes = {};
     };
+    language_id = "python";
   }])
diff --git a/modules/kernels/python/language_servers/language_server_pylint/config.nix b/modules/kernels/python/language_servers/language_server_pylint/config.nix
@@ -90,4 +90,5 @@ common.writeTextDirWithMetaAndPassthru python.pkgs.pylint.meta passthru "lib/cod
       formatters = {};
       formatFiletypes = {};
     };
+    language_id = "python";
   }])
diff --git a/modules/kernels/python/language_servers/language_server_pyright/config.nix b/modules/kernels/python/language_servers/language_server_pyright/config.nix
@@ -64,4 +64,6 @@ common.writeTextDirWithMetaAndPassthru pyright.meta passthru "lib/codedown/langu
     # We need to send empty string, otherwise  pyright-langserver fails with parse error
     # "python.venvPath" = "";
   };
+
+  language_id = "python";
 }])
diff --git a/modules/kernels/python/language_servers/language_server_pythonlsp/config.nix b/modules/kernels/python/language_servers/language_server_pythonlsp/config.nix
@@ -62,4 +62,5 @@ common.writeTextDirWithMetaAndPassthru python.pkgs.python-lsp-server.meta passth
     type = "stream";
     args = ["${python}/bin/python" "-m" "pylsp"];
     initialization_options = import ../pylsp_initialization_options.nix "pylsp";
+    language_id = "python";
   }])
diff --git a/modules/kernels/r/language-server-languageserver/default.nix b/modules/kernels/r/language-server-languageserver/default.nix
@@ -37,4 +37,5 @@ common.writeTextDirWithMetaAndPassthru languageserver.meta passthru "lib/codedow
   type = "stream";
   primary = true;
   args = ["${rWithPackagesAndLanguageServer}/bin/R" "--slave" "-e" "languageserver::run()"];
+  language_id = "r";
 }])
diff --git a/modules/kernels/ruby/solargraph.nix b/modules/kernels/ruby/solargraph.nix
@@ -30,4 +30,5 @@ common.writeTextDirWithMetaAndPassthru solargraph.meta passthru "lib/codedown/la
   attrs = ["ruby"];
   type = "stream";
   args = ["${solargraph}/bin/solargraph" "stdio"];
+  language_id = "ruby";
 }])
diff --git a/modules/kernels/rust/language_server_rust_analyzer/config.nix b/modules/kernels/rust/language_server_rust_analyzer/config.nix
@@ -174,6 +174,8 @@ let
 
       # "RA_LOG" = "rust_analyzer=info";
     };
+
+    language_id = "rust";
   };
 
 in
diff --git a/tests/app/Spec/Tests/Bash.hs b/tests/app/Spec/Tests/Bash.hs
@@ -37,7 +37,7 @@ tests = describe "Bash" $ introduceNixEnvironment [kernelSpec] [] "Bash" $ intro
   --                                            |] $ \diagnostics -> do
   --   assertDiagnosticRanges diagnostics []
 
-  testDiagnostics "bash-language-server" "test.sh" Nothing [__i|FOO=42|] $ \diagnostics -> do
+  testDiagnostics "bash-language-server" "test.sh" LanguageKind_ShellScript [__i|FOO=42|] $ \diagnostics -> do
     assertDiagnosticRanges diagnostics [
       (Range (Position 0 0) (Position 0 3), Just (InR "SC2034"))
       ]
diff --git a/tests/app/Spec/Tests/Clojure.hs b/tests/app/Spec/Tests/Clojure.hs
@@ -31,7 +31,7 @@ tests = describe "Clojure" $ introduceNixEnvironment [kernelSpec] [] "Clojure" $
 
   testKernelStdout "clojure" [__i|(println "hi")|] "hi\n"
 
-  testDiagnostics "clojure-lsp" "test.clj" Nothing [__i|(foo 42)|] $ \diagnostics -> do
+  testDiagnostics "clojure-lsp" "test.clj" LanguageKind_Clojure [__i|(foo 42)|] $ \diagnostics -> do
     assertDiagnosticRanges diagnostics [(Range (Position 0 1) (Position 0 4), Just (InR "unresolved-symbol"))]
 
 
diff --git a/tests/app/Spec/Tests/Cpp.hs b/tests/app/Spec/Tests/Cpp.hs
@@ -40,7 +40,7 @@ tests' flavor = describe [i|C++ (#{flavor})|] $ introduceNixEnvironment [kernelS
 testsWithLsp :: Text -> LanguageSpec
 testsWithLsp flavor = describe [i|C++ (#{flavor}) with LSP|] $ introduceNixEnvironment [kernelSpecWithLsp flavor] [] "C++" $ do
   describe "LSP" $ do
-    testDiagnostics'' "simple" lsName "test.cpp" (Just "cpp")
+    testDiagnostics'' "simple" lsName "test.cpp" LanguageKind_CPP
       [__i|int main() {
              undefined_function();
              return 0;
diff --git a/tests/app/Spec/Tests/Go.hs b/tests/app/Spec/Tests/Go.hs
@@ -33,7 +33,7 @@ tests = describe "Go" $ introduceNixEnvironment [kernelSpec] [] "Go" $ introduce
   testKernelStdout "go" [__i|import("fmt")
                              fmt.Println("hi")|] "hi\n"
 
-  testDiagnosticsLabel "gopls: Undeclared name" "gopls" "test.go" Nothing printUnknownCode $ \diagnostics ->
+  testDiagnosticsLabel "gopls: Undeclared name" "gopls" "test.go" LanguageKind_Go printUnknownCode $ \diagnostics ->
     assertDiagnosticRanges diagnostics [(Range (Position 3 12) (Position 3 15), Just (InR "UndeclaredName"))]
 
 printUnknownCode :: Text
diff --git a/tests/app/Spec/Tests/Haskell/CodeActions.hs b/tests/app/Spec/Tests/Haskell/CodeActions.hs
@@ -8,6 +8,7 @@ import Data.Text
 import Language.LSP.Protocol.Lens hiding (actions)
 import Language.LSP.Protocol.Types
 import Language.LSP.Test hiding (message)
+import qualified Language.LSP.Test.Helpers as Helpers
 import Spec.Tests.Haskell.Common
 import Test.Sandwich as Sandwich
 import TestLib.LSP
@@ -17,13 +18,13 @@ import UnliftIO.Timeout
 
 tests :: (LspContext context m, HasNixEnvironment context) => Text -> SpecFree context m ()
 tests ghcPackage = describe "Code actions" $ do
-  it "gets no code actions for putStrLn" $ doNotebookSession lsName codeActionsCode $ \filename -> do
-    ident <- openDoc filename "haskell"
+  it "gets no code actions for putStrLn" $ doNotebookSession lsName codeActionsCode $ \(Helpers.LspSessionInfo {..}) -> do
+    ident <- openDoc lspSessionInfoFileName "haskell"
     actions <- timeout 60_000_000 $ getCodeActions ident (Range (Position 1 0) (Position 1 8))
     actions `shouldBe` (Just [])
 
-  it "gets code actions for foo" $ doNotebookSession lsName codeActionsCode $ \filename -> do
-    ident <- openDoc filename "haskell"
+  it "gets code actions for foo" $ doNotebookSession lsName codeActionsCode $ \(Helpers.LspSessionInfo {..}) -> do
+    ident <- openDoc lspSessionInfoFileName "haskell"
     actions <- timeout 60_000_000 $ getCodeActions ident (Range (Position 0 0) (Position 0 3))
     case ghcPackage of
       x | x `L.elem` ["ghc910", "ghc912"] -> actions `shouldBe` (Just []) -- TODO: figure out why this is
diff --git a/tests/app/Spec/Tests/Haskell/Diagnostics.hs b/tests/app/Spec/Tests/Haskell/Diagnostics.hs
@@ -27,26 +27,26 @@ import TestLib.Types
 tests :: (LspContext context m, HasNixEnvironment context) => Text -> Text -> SpecFree context m ()
 tests ghcPackage lsName = describe "Diagnostics" $ do
   describe "Foo.hs" $ do
-    testDiagnosticsLabelDesired "Out of scope variable" lsName "Foo.hs" Nothing
+    testDiagnosticsLabelDesired "Out of scope variable" lsName "Foo.hs" LanguageKind_Haskell
       [__i|module Foo where
            foo = bar
           |]
       ((== [(Range (Position 1 6) (Position 1 9), Just (InR "GHC-88464"))]) . getDiagnosticRanges)
 
     when (ghcPackage /= "ghc910") $ -- TODO: re-enable hlint test
-      testDiagnosticsLabelDesired "Eta reduce" lsName "Foo.hs" Nothing etaExpandCode
+      testDiagnosticsLabelDesired "Eta reduce" lsName "Foo.hs" LanguageKind_Haskell etaExpandCode
         ((== [(Range (Position 6 0) (Position 6 14), Just (InR "refact:Eta reduce"))]) . getDiagnosticRanges)
 
   describe "main.ipynb" $ do
-    testDiagnosticsLabelDesired "Top-level putStrLn" lsName "main.ipynb" Nothing
+    testDiagnosticsLabelDesired "Top-level putStrLn" lsName "main.ipynb" LanguageKind_Haskell
       [__i|-- A comment
            foo = bar
 
            putStrLn "HI"
           |]
       ((== [(Range (Position 1 6) (Position 1 9), Just (InR "GHC-88464"))]) . getDiagnosticRanges)
 
-    testDiagnosticsLabel "Top-level putStrLn with diagnostic" lsName "main.ipynb" Nothing
+    testDiagnosticsLabel "Top-level putStrLn with diagnostic" lsName "main.ipynb" LanguageKind_Haskell
       [__i|-- Some comment
            import Data.ByteString.Lazy.Char8 as BL
            foo = bar
@@ -56,15 +56,15 @@ tests ghcPackage lsName = describe "Diagnostics" $ do
         [(Range (Position 4 0) (Position 4 8), x)] | containsAll x ["Ambiguous occurrence", "putStrLn"] -> return ()
         xs -> expectationFailure [i|Unexpected diagnostics: #{xs}|]
 
-    testDiagnosticsLabelDesired "Reordering" lsName "main.ipynb" Nothing
+    testDiagnosticsLabelDesired "Reordering" lsName "main.ipynb" LanguageKind_Haskell
       [__i|import Data.Aeson.TH
            {-\# LANGUAGE TemplateHaskell \#-}
            foo = bar -- This should be the only diagnostic we get
            data Foo = Bar | Baz
            $(deriveJSON defaultOptions ''Foo)|]
       ((== [(Range (Position 2 6) (Position 2 9), Just (InR "GHC-88464"))]) . getDiagnosticRanges)
 
-    testDiagnosticsLabelDesired "Complicated reordering" lsName "main.ipynb" Nothing
+    testDiagnosticsLabelDesired "Complicated reordering" lsName "main.ipynb" LanguageKind_Haskell
       [__i|import Data.Aeson as A
            import Data.Aeson.TH
            :set -XTemplateHaskell
diff --git a/tests/app/Spec/Tests/Haskell/DocumentHighlight.hs b/tests/app/Spec/Tests/Haskell/DocumentHighlight.hs
@@ -10,6 +10,7 @@ import Data.String.Interpolate
 import Data.Text as T
 import Language.LSP.Protocol.Types
 import Language.LSP.Test hiding (message)
+import qualified Language.LSP.Test.Helpers as Helpers
 import Spec.Tests.Haskell.Common
 import Test.Sandwich as Sandwich
 import TestLib.LSP
@@ -18,12 +19,12 @@ import TestLib.Types
 
 tests :: (LspContext context m, HasNixEnvironment context) => SpecFree context m ()
 tests = describe "Document highlight" $ do
-  it "foo (.ipynb)" $ doNotebookSession lsName documentHighlightCode $ \filename -> do
-    ident <- openDoc filename "haskell"
+  it "foo (.ipynb)" $ doNotebookSession lsName documentHighlightCode $ \(Helpers.LspSessionInfo {..}) -> do
+    ident <- openDoc lspSessionInfoFileName "haskell"
     getHighlights ident (Position 0 1) >>= (`shouldBe` documentHighlightResults)
 
-  it "foo (.hs)" $ doSession' "Test.hs" lsName documentHighlightCodeRegular $ \filename -> do
-    ident <- openDoc filename "haskell"
+  it "foo (.hs)" $ doSession' "Test.hs" lsName documentHighlightCodeRegular $ \(Helpers.LspSessionInfo {..}) -> do
+    ident <- openDoc lspSessionInfoFileName "haskell"
     getHighlights ident (Position 0 1) >>= (
       `shouldBe`  [
           DocumentHighlight (Range (Position 0 0) (Position 0 3)) (Just DocumentHighlightKind_Write)
diff --git a/tests/app/Spec/Tests/Haskell/Hover.hs b/tests/app/Spec/Tests/Haskell/Hover.hs
@@ -8,6 +8,7 @@ import Data.Text as T
 import Language.LSP.Protocol.Lens hiding (hover)
 import Language.LSP.Protocol.Types
 import Language.LSP.Test hiding (message)
+import qualified Language.LSP.Test.Helpers as Helpers
 import Spec.Tests.Haskell.Common
 import Test.Sandwich as Sandwich
 import TestLib.LSP
@@ -16,14 +17,14 @@ import TestLib.Types
 
 tests :: (LspContext context m, HasNixEnvironment context) => SpecFree context m ()
 tests = describe "Hover" $ do
-  it "hovers foo" $ doNotebookSession lsName hoverCode $ \filename -> do
-    ident <- openDoc filename "haskell"
+  it "hovers foo" $ doNotebookSession lsName hoverCode $ \(Helpers.LspSessionInfo {..}) -> do
+    ident <- openDoc lspSessionInfoFileName "haskell"
     hover <- getHoverOrException ident (Position 0 1)
     allHoverText hover `textShouldContain` [i|foo|]
     allHoverText hover `textShouldContain` [i|main.ipynb.hs:1:1|]
 
-  it "hovers putStrLn" $ doNotebookSession lsName hoverCode $ \filename -> do
-    ident <- openDoc filename "haskell"
+  it "hovers putStrLn" $ doNotebookSession lsName hoverCode $ \(Helpers.LspSessionInfo {..}) -> do
+    ident <- openDoc lspSessionInfoFileName "haskell"
     hover <- getHoverOrException ident (Position 1 1)
     (hover ^. range) `shouldBe` Just (Range (Position 1 0) (Position 1 8))
     let InL (MarkupContent {..}) = hover ^. contents
diff --git a/tests/app/Spec/Tests/Haskell/Statements.hs b/tests/app/Spec/Tests/Haskell/Statements.hs
@@ -6,6 +6,7 @@ import Data.String.Interpolate
 import Data.Text as T
 import Language.LSP.Protocol.Types
 import Language.LSP.Test hiding (message)
+import qualified Language.LSP.Test.Helpers as Helpers
 import Spec.Tests.Haskell.Common
 import Spec.Tests.Haskell.DocumentHighlight (documentHighlightResults)
 import Test.Sandwich as Sandwich
@@ -17,23 +18,23 @@ import UnliftIO.Timeout
 tests :: (LspContext context m, HasNixEnvironment context) => Text -> SpecFree context m ()
 tests ghcPackage = describe "Statements" $ do
   describe "Single-line" $ do
-    it "doesn't choke" $ doNotebookSession lsName statementsCode $ \filename -> do
-      ident <- openDoc filename "haskell"
+    it "doesn't choke" $ doNotebookSession lsName statementsCode $ \(Helpers.LspSessionInfo {..}) -> do
+      ident <- openDoc lspSessionInfoFileName "haskell"
       timeout 120_000_000 (getHighlights ident (Position 0 1)) >>= (`shouldBe` (Just documentHighlightResults))
 
     when (ghcPackage /= "ghc910") $ -- TODO: re-enable hlint test
-      testDiagnosticsLabel "Empty diagnostics" lsName "main.ipynb" Nothing statementsCode $ \diagnostics -> do
+      testDiagnosticsLabel "Empty diagnostics" lsName "main.ipynb" LanguageKind_Haskell statementsCode $ \diagnostics -> do
         -- Note: normally the server wouldn't send empty diagnostics. But the statement inserts "= unsafePerformIO $ ",
         -- which causes it to emit a "redundant bracket" diagnostic, which then gets filtered out by untransformPosition
         diagnostics `shouldBe` []
 
   describe "Multi-line" $ do
-    it "doesn't choke" $ doNotebookSession lsName statementsCode $ \filename -> do
-      ident <- openDoc filename "haskell"
+    it "doesn't choke" $ doNotebookSession lsName statementsCode $ \(Helpers.LspSessionInfo {..}) -> do
+      ident <- openDoc lspSessionInfoFileName "haskell"
       timeout 120_000_000 (getHighlights ident (Position 0 1)) >>= (`shouldBe` (Just documentHighlightResults))
 
     when (ghcPackage /= "ghc910") $ -- TODO: re-enable hlint test
-      testDiagnosticsLabel "Redundant bracket" lsName "main.ipynb" Nothing statementsCodeMultiline $ \diagnostics -> do
+      testDiagnosticsLabel "Redundant bracket" lsName "main.ipynb" LanguageKind_Haskell statementsCodeMultiline $ \diagnostics -> do
         info [i|Got diagnostics: #{diagnostics}|]
         assertDiagnosticRanges diagnostics [(Range (Position 1 9) (Position 1 14), Just (InR "refact:Redundant bracket"))]
 
diff --git a/tests/app/Spec/Tests/Haskell/Symbols.hs b/tests/app/Spec/Tests/Haskell/Symbols.hs
@@ -4,6 +4,7 @@ module Spec.Tests.Haskell.Symbols (tests) where
 import Control.Lens ((^.))
 import Language.LSP.Protocol.Lens hiding (actions)
 import Language.LSP.Test hiding (message)
+import qualified Language.LSP.Test.Helpers as Helpers
 import Spec.Tests.Haskell.Common
 import Spec.Tests.Haskell.DocumentHighlight (documentHighlightCode)
 import Test.Sandwich as Sandwich
@@ -14,7 +15,7 @@ import UnliftIO.Timeout
 
 tests :: (LspContext context m, HasNixEnvironment context) => SpecFree context m ()
 tests = describe "Symbols" $ do
-  it "symbols" $ doNotebookSession lsName documentHighlightCode $ \filename -> do
-    ident <- openDoc filename "haskell"
+  it "symbols" $ doNotebookSession lsName documentHighlightCode $ \(Helpers.LspSessionInfo {..}) -> do
+    ident <- openDoc lspSessionInfoFileName "haskell"
     Just (Right documentSymbols) <- timeout 300_000_000 $ getDocumentSymbols ident
     fmap (^. name) documentSymbols `shouldBe` ["foo"]
diff --git a/tests/app/Spec/Tests/Julia.hs b/tests/app/Spec/Tests/Julia.hs
@@ -10,6 +10,7 @@ import Data.Text as T
 import Language.LSP.Protocol.Lens hiding (diagnostics, hover, text)
 import Language.LSP.Protocol.Types
 import Language.LSP.Test hiding (message)
+import qualified Language.LSP.Test.Helpers as Helpers
 import Test.Sandwich as Sandwich
 import TestLib.JupyterRunnerContext
 import TestLib.LSP
@@ -45,12 +46,12 @@ juliaTests juliaPackage = describe [i|Julia (#{juliaPackage})|] $ introduceNixEn
   describe "LSP" $ do
     Diagnostics.tests lsName
 
-    itHasHoverSatisfying lsName "test.jl" (Just "julia") [__i|print("hi")|] (Position 0 2) $ \hover -> do
+    itHasHoverSatisfying lsName "test.jl" (LanguageKind_Custom "julia") [__i|print("hi")|] (Position 0 2) $ \hover -> do
       let InL (MarkupContent MarkupKind_Markdown text) = hover ^. contents
       text `textShouldContain` "Write to `io` (or to the default output stream"
 
-    it "highlights foo" $ doNotebookSession lsName documentHighlightCode $ \filename -> do
-      ident <- openDoc filename "julia"
+    it "highlights foo" $ doNotebookSession lsName documentHighlightCode $ \(Helpers.LspSessionInfo {..}) -> do
+      ident <- openDoc lspSessionInfoFileName "julia"
       getHighlights ident (Position 0 1) >>= (`shouldBe` documentHighlightResults)
 
 
diff --git a/tests/app/Spec/Tests/Julia/Diagnostics.hs b/tests/app/Spec/Tests/Julia/Diagnostics.hs
@@ -13,18 +13,18 @@ import TestLib.Types
 
 tests :: (LspContext context m, HasNixEnvironment context) => Text -> SpecFree context m ()
 tests lsName = describe "Diagnostics" $ do
-  testDiagnostics'' "flags a simple missing reference" lsName "test.jl" (Just "julia") [i|printlnzzzz("HI")|] [] $ \diagnostics -> do
+  testDiagnostics'' "flags a simple missing reference" lsName "test.jl" (LanguageKind_Custom "julia") [i|printlnzzzz("HI")|] [] $ \diagnostics -> do
     assertDiagnosticRanges' diagnostics [(Range (Position 0 0) (Position 0 11), Nothing, "Missing reference: printlnzzzz")]
 
-  testDiagnosticsLabelDesired "finds symbols from JSON3 package" lsName "test.jl" (Just "julia")
+  testDiagnosticsLabelDesired "finds symbols from JSON3 package" lsName "test.jl" (LanguageKind_Custom "julia")
     [__i|using JSON3: write
          tup = (:car,"Mercedes","S500",5,250.1)
          write(tup)
          printlnzzzz("HI")
          |]
     ((== [(Range (Position 3 0) (Position 3 11), Nothing, "Missing reference: printlnzzzz")]) . getDiagnosticRanges')
 
-  testDiagnosticsLabelDesired "finds symbols from Roots package" lsName "test.jl" (Just "julia")
+  testDiagnosticsLabelDesired "finds symbols from Roots package" lsName "test.jl" (LanguageKind_Custom "julia")
     [__i|using Roots: Bisection, find_zero
          f(x) = exp(x) - x^4
          find_zero(f, (8, 9), Bisection())
@@ -34,7 +34,7 @@ tests lsName = describe "Diagnostics" $ do
 
   -- This test is tricky because symbols like "plot" actually come from RecipesBase (or something), so
   -- it checks we're indexing such a transitive dependency.
-  testDiagnosticsLabelDesired "finds symbols from Plots package" lsName "test.jl" (Just "julia")
+  testDiagnosticsLabelDesired "finds symbols from Plots package" lsName "test.jl" (LanguageKind_Custom "julia")
     [__i|using Plots: plot, plot!
          xx = range(0, 10, length=100)
          y = sin.(xx)
diff --git a/tests/app/Spec/Tests/Python.hs b/tests/app/Spec/Tests/Python.hs
diff --git a/tests/app/Spec/Tests/Ruby.hs b/tests/app/Spec/Tests/Ruby.hs
diff --git a/tests/app/Spec/Tests/Rust/Changes.hs b/tests/app/Spec/Tests/Rust/Changes.hs
diff --git a/tests/app/Spec/Tests/Rust/Completion.hs b/tests/app/Spec/Tests/Rust/Completion.hs
diff --git a/tests/app/Spec/Tests/Rust/Diagnostics.hs b/tests/app/Spec/Tests/Rust/Diagnostics.hs
diff --git a/tests/app/Spec/Tests/Rust/Hovers.hs b/tests/app/Spec/Tests/Rust/Hovers.hs
diff --git a/tests/app/Spec/Tests/Spellchecker.hs b/tests/app/Spec/Tests/Spellchecker.hs
diff --git a/tests/app/Spec/Tests/Typst.hs b/tests/app/Spec/Tests/Typst.hs
diff --git a/tests/flake.nix b/tests/flake.nix
diff --git a/tests/package.yaml b/tests/package.yaml
diff --git a/tests/src/TestLib/LSP.hs b/tests/src/TestLib/LSP.hs
diff --git a/tests/stack.yaml b/tests/stack.yaml
diff --git a/tests/stack.yaml.lock b/tests/stack.yaml.lock
diff --git a/tests/tests.cabal b/tests/tests.cabal
