Use glitterOnWith instead

flake.lock

@@ -43,11 +43,10 @@
         "nixpkgs": "nixpkgs"
       },
       "locked": {
-        "lastModified": 1708355228,
-        "narHash": "sha256-UqWqoxTr5cbTSdIPUtVp22xhBMaBy3VbbFrp1SMr424=",
-        "ref": "refs/heads/main",
-        "rev": "80fd7821b0e55ec6706d638a6303c9ead2cd1059",
-        "revCount": 1,
+        "dirtyRev": "e40b8ead4d46261fccf1530507b191d9a1ef831b-dirty",
+        "dirtyShortRev": "e40b8ea-dirty",
+        "lastModified": 1708355706,
+        "narHash": "sha256-a7sHHhQPvDaEjmCAgiAN9OQRJMQNkFVNHzjIu0BYfAg=",
         "type": "git",
         "url": "file:///Users/chrg/Develop/repos/hspec-glitter"
       },

rtree/test/src/Control/Monad/IRTreeSpec.hs

@@ -42,10 +42,16 @@ spec = describe "examples" do
 
     rex <- runIO $ RTree.reduce predicate re
 
-    it "should find an opr" do
+    onGlitterWith
+      ("test/expected/" <> str <> "-red")
+      ( \fp () -> do
           (mex, result) <- runWriterT (IRTree.reduce (debugPredicate showString (prettyExprS 0) predicate) me)
+          writeFile fp (appEndo result "")
+          pure mex
+      )
+      do
+        it "should produce the same results as the RTree" \mex -> do
           rex `shouldBe` mex
-      pure $ glitter ("test/expected/" <> str <> "-red") (appEndo result "")
 
     it "should find an opr exponentially" do
       (mex, result) <- runWriterT (IRTree.reduceExp (debugPredicate showString (prettyExprS 0) predicate) me)