diff --git a/compiler/tests-jsoo/lib-effects/dune b/compiler/tests-jsoo/lib-effects/dune
index c7267431d8..798bf06d24 100644
--- a/compiler/tests-jsoo/lib-effects/dune
+++ b/compiler/tests-jsoo/lib-effects/dune
@@ -1,10 +1,12 @@
 (env
  (with-effects-double-translation)
  (with-effects)
-; (wasi
-;  (wasm_of_ocaml
-;   (flags
-;    (:standard --enable effects))))
+ (wasi
+  (wasm_of_ocaml
+   (enabled_if
+    (or
+     (= %{env:WASM_ENGINE=node} "wizard")
+     (= %{env:WASM_ENGINE=node} "wizard-fast")))))
  (_
   (js_of_ocaml
    (flags
diff --git a/compiler/tests-ocaml/effect-syntax/dune b/compiler/tests-ocaml/effect-syntax/dune
index e7322d3b63..9c0322729e 100644
--- a/compiler/tests-ocaml/effect-syntax/dune
+++ b/compiler/tests-ocaml/effect-syntax/dune
@@ -1,12 +1,12 @@
 (env
  (with-effects-double-translation)
  (with-effects)
-; (wasi
-;  (flags
-;   (:standard -w -38))
-;  (wasm_of_ocaml
-;   (flags
-;    (:standard --enable=effects))))
+ (wasi
+  (wasm_of_ocaml
+   (enabled_if
+    (or
+     (= %{env:WASM_ENGINE=node} "wizard")
+     (= %{env:WASM_ENGINE=node} "wizard-fast")))))
  (_
   (js_of_ocaml
    (flags
diff --git a/compiler/tests-ocaml/effects/dune b/compiler/tests-ocaml/effects/dune
index 0f434043c0..c9244e5b1a 100644
--- a/compiler/tests-ocaml/effects/dune
+++ b/compiler/tests-ocaml/effects/dune
@@ -1,12 +1,12 @@
 (env
  (with-effects-double-translation)
  (with-effects)
-; (wasi
-;  (flags
-;   (:standard -w -38))
-;  (wasm_of_ocaml
-;   (flags
-;    (:standard --enable=effects))))
+ (wasi
+  (wasm_of_ocaml
+   (enabled_if
+    (or
+     (= %{env:WASM_ENGINE=node} "wizard")
+     (= %{env:WASM_ENGINE=node} "wizard-fast")))))
  (_
   (js_of_ocaml
    (flags
diff --git a/dune b/dune
index 150a7dacbd..d00db59696 100644
--- a/dune
+++ b/dune
@@ -33,7 +33,7 @@
  (wasi
   (wasm_of_ocaml
    (flags
-    (:standard --pretty --enable wasi))
+    (:standard --pretty --enable wasi --enable trap-on-exception))
    (compilation_mode whole_program))
   (binaries
    (tools/node_wrapper.exe as node)
diff --git a/tools/node_wrapper.ml b/tools/node_wrapper.ml
index 15979975a8..583b72ab15 100644
--- a/tools/node_wrapper.ml
+++ b/tools/node_wrapper.ml
@@ -1,3 +1,17 @@
+let wizard_args = [ "-ext:stack-switching"; "--dir=." ]
+
+let wasmfxtime_args =
+  [ (*"-C"
+  ; "collector=null"
+  ; *)
+    "-W=exceptions,function-references,stack-switching,gc"
+  ; "--dir=."
+  ]
+
+let wasmtime_args = [ (*"-C"
+  ; "collector=null"
+  ; *) "-W=all-proposals=y"; "--dir=." ]
+
 let extra_args_for_wasoo =
   [ "--experimental-wasm-imported-strings"
   ; "--experimental-wasm-stack-switching"
@@ -23,16 +37,37 @@ let env =
       else e)
     env
 
-let args =
+let find_wasm file =
+  let dir = Filename.chop_extension file ^ ".assets" in
+  Filename.concat
+    dir
+    (List.find
+       (fun f -> Filename.check_suffix f ".wasm")
+       (Array.to_list (Sys.readdir dir)))
+
+let exe, args =
   match Array.to_list Sys.argv with
   | exe :: argv ->
-      let argv =
+      let exe', argv =
         match argv with
-        | file :: _ when Filename.check_suffix file ".wasm.js" ->
-            extra_args_for_wasoo @ argv
-        | _ -> extra_args_for_jsoo @ argv
+        | file :: _ when Filename.check_suffix file ".wasm.js" -> (
+            match Sys.getenv_opt "WASM_ENGINE" with
+            | Some "wizard" ->
+                ( "/home/jerome/sources/wizard-engine/bin/wizeng.x86-linux"
+                , wizard_args @ (find_wasm file :: List.tl argv) )
+            | Some "wizard-fast" ->
+                ( "/home/jerome/sources/wizard-engine/bin/wizeng.x86-64-linux"
+                , wizard_args @ (find_wasm file :: List.tl argv) )
+            | Some "wasmfxtime" ->
+                ( "/home/jerome/sources/wasmfxtime/target/debug/wasmtime"
+                , wasmfxtime_args @ (find_wasm file :: List.tl argv) )
+            | Some "wasmtime" ->
+                ( "/home/jerome/sources/wasmtime/target/debug/wasmtime"
+                , wasmtime_args @ (find_wasm file :: List.tl argv) )
+            | _ -> "node", extra_args_for_wasoo @ argv)
+        | _ -> "node", extra_args_for_jsoo @ argv
       in
-      Array.of_list (exe :: argv)
+      exe', Array.of_list (exe :: argv)
   | [] -> assert false
 
 let () =
@@ -45,4 +80,4 @@ let () =
     | _, WEXITED n -> exit n
     | _, WSIGNALED _ -> exit 9
     | _, WSTOPPED _ -> exit 9
-  else Unix.execvpe "node" args env
+  else Unix.execvpe exe args env