1 files changed, 47 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/wasm/async-instantiate.js b/js/src/jit-test/tests/wasm/async-instantiate.js
new file mode 100644
index 0000000000..f10d0a47c1
--- /dev/null
+++ b/js/src/jit-test/tests/wasm/async-instantiate.js
@@ -0,0 +1,47 @@
+const { Module, Instance, Global, instantiate, instantiateStreaming } = WebAssembly;
+
+const g = new Global({value: "i32", mutable:true}, 0);
+
+const code = wasmTextToBinary(`(module
+    (global $g (import "" "g") (mut i32))
+    (func $start (set_global $g (i32.add (get_global $g) (i32.const 1))))
+    (start $start)
+)`);
+const module = new Module(code);
+
+const importObj = { '': { get g() { g.value++; return g } } };
+
+g.value = 0;
+new Instance(module, importObj);
+assertEq(g.value, 2);
+
+g.value = 0;
+instantiate(module, importObj).then(i => {
+  assertEq(i instanceof Instance, true);
+  assertEq(g.value, 2);
+  g.value++;
+});
+assertEq(g.value, 1);
+drainJobQueue();
+assertEq(g.value, 3);
+
+g.value = 0;
+instantiate(code, importObj).then(({module,instance}) => {
+    assertEq(module instanceof Module, true);
+    assertEq(instance instanceof Instance, true);
+    assertEq(g.value, 2); g.value++; }
+);
+drainJobQueue();
+assertEq(g.value, 3);
+
+if (wasmStreamingEnabled()) {
+  g.value = 0;
+  instantiateStreaming(code, importObj).then(({module,instance}) => {
+      assertEq(module instanceof Module, true);
+      assertEq(instance instanceof Instance, true);
+      assertEq(g.value, 2);
+      g.value++;
+  });
+  drainJobQueue();
+  assertEq(g.value, 3);
+}