fix tests

src/effects.js

@@ -181,7 +181,7 @@ export const apply_side_effects = (prev, next, ui) => {
     next.eval_modules_state != null
   ) {
     const s = next.eval_modules_state
-    s.promise.__original_then(result => {
+    s.promise.then(result => {
       exec('eval_modules_finished', 
         next, /* becomes prev_state */
         result, 

src/eval.js

@@ -515,7 +515,8 @@ export const eval_modules = (
   }
 
   if(is_async) {
-    return result.__original_then(make_result)
+    // convert app_window.Promise to host Promise
+    return Promise.resolve(result).then(make_result)
   } else {
     return make_result(result)
   }

src/runtime/record_io.js

@@ -75,7 +75,7 @@ const make_patched_method = (window, original, name, use_context) => {
           ? new original(...args)
           : original.apply(this, args)
 
-        if(value instanceof cxt.window.Promise) {
+        if(value?.[Symbol.toStringTag] == 'Promise') {
           // TODO use __original_then, not finally which calls
           // patched 'then'?
           value = value.finally(() => {

src/runtime/runtime.js

@@ -262,7 +262,7 @@ const __await_start = (cxt, promise) => {
   const children_copy = cxt.children
   const result = {children_copy, promise}
 
-  if(promise instanceof cxt.window.Promise) {
+  if(promise?.[Symbol.toStringTag] == 'Promise') {
     result.promise = promise.then(
       (value) => {
         result.status = {ok: true, value}

test/run_utils.js

@@ -1,3 +1,13 @@
+/*
+  For node.js tests
+
+  It forces node.js to load Response (which is loaded lazily)
+
+  Without this, `Response` loading code would be executed in record_io.js and
+  break test by calling `now()`
+*/
+globalThis.Response
+
 export const run = tests => {
   // Runs test, return failure or null if not failed
   const run_test = t => {

test/test.js

@@ -1059,7 +1059,7 @@ export const tests = [
       'a': 'Object.assign(globalThis, {test_import: true})',
     })
     assert_equal(i.active_calltree_node.ok, true)
-    assert_equal(globalThis.test_import, true)
+    assert_equal(globalThis.app_window.test_import, true)
   }),
 
   test('modules bare import', () => {
@@ -1068,7 +1068,7 @@ export const tests = [
       'a': 'Object.assign(globalThis, {test_import: true})',
     })
     assert_equal(i.active_calltree_node.ok, true)
-    assert_equal(globalThis.test_import, true)
+    assert_equal(globalThis.app_window.test_import, true)
   }),
 
   test('bug parser pragma external', () => {

test/utils.js

@@ -11,12 +11,17 @@ Object.assign(globalThis,
     // for convenince, to type just `log` instead of `console.log`
     log: console.log,
 
-    // For test env, set globalThis.app_window to just globalThis
-    app_window: globalThis,
   }
 )
 
 export const patch_builtin = new Function(`
+if(globalThis.process != null ) {
+  globalThis.app_window = globalThis
+} else {
+  const iframe = globalThis.document.createElement('iframe')
+  globalThis.document.body.appendChild(iframe)
+  globalThis.app_window = iframe.contentWindow
+}
   let originals = globalThis.app_window.__builtins_originals
   let patched = globalThis.app_window.__builtins_patched
   if(originals == null) {
@@ -170,9 +175,9 @@ export const test_deferred_calls_state = code => {
 
 export const stringify = val => 
   JSON.stringify(val, (key, value) => {
-    if(value instanceof Set){
+    if(value?.[Symbol.toStringTag] == 'Set'){
       return [...value]
-    } else if (value instanceof Map) {
+    } else if(value?.[Symbol.toStringTag] == 'Map'){
       return Object.fromEntries([...value.entries()])
     } else if(value instanceof Error) {
       return {message: value.message}