Wasm_of_ocaml: fix the execution of tests in a sandbox (#11304)

* Wasm: test sandboxing

Signed-off-by: Jérôme Vouillon <[email protected]>

doc/changes/11304.md

@@ -0,0 +1 @@
+- Wasm_of_ocaml: fix the execution of tests in a sandbox.  (#11304, @vouillon)

src/dune_rules/inline_tests.ml

@@ -296,7 +296,15 @@ include Sub_system.Register_end_point (struct
              | Error _ -> Action_builder.return action
              | Ok p -> Action_builder.path p >>> Action_builder.return action)
         and+ () = deps
-        and+ () = Action_builder.path exe in
+        and+ () = Action_builder.path exe
+        and+ () =
+          match mode with
+          | Native | Best | Byte | Jsoo JS -> Action_builder.return ()
+          | Jsoo Wasm ->
+            Action_builder.path
+              (Path.build
+                 (Path.Build.relative inline_test_dir (name ^ Js_of_ocaml.Ext.wasm_dir)))
+        in
         Action.chdir (Path.build dir) action
       in
       let flags partition : string list Action_builder.t =

src/dune_rules/test_rules.ml

@@ -104,7 +104,14 @@ let rules (t : Tests.t) ~sctx ~dir ~scope ~expander ~dir_contents =
             | None -> t.deps
             | Some _ ->
               Bindings.Unnamed (Dep_conf.File (String_with_vars.make_text loc test_exe))
-              :: t.deps
+              ::
+              (match runtest_mode with
+               | `js Wasm ->
+                 Bindings.Unnamed
+                   (Dep_conf.File
+                      (String_with_vars.make_text loc (s ^ Js_of_ocaml.Ext.wasm_dir)))
+                 :: t.deps
+               | `js JS | `exe | `bc -> t.deps)
           in
           let add_alias ~loc ~action =
             (* CR rgrinberg: why are we going through the stanza api? *)

test/blackbox-tests/test-cases/wasmoo/sandboxing.t/dune-project

@@ -0,0 +1 @@
+(lang dune 3.17)

test/blackbox-tests/test-cases/wasmoo/sandboxing.t/inline_test/dune

@@ -0,0 +1,11 @@
+(library
+ (name inline_test)
+ (modules inline_test)
+ (inline_tests
+  (modes wasm)
+  (backend inline_test_backend)))
+
+(library
+ (name inline_test_backend)
+ (modules inline_test_backend)
+ (inline_tests.backend (generate_runner (echo ""))))

test/blackbox-tests/test-cases/wasmoo/sandboxing.t/run.t

@@ -0,0 +1,3 @@
+Run tests and inline tests within a sandbox in copy mode
+
+  $ dune runtest --sandbox=copy

test/blackbox-tests/test-cases/wasmoo/sandboxing.t/test/dune

@@ -0,0 +1,3 @@
+(test
+ (modes wasm)
+ (name test))