1 files changed, 40 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/statements/async-generator/params-trailing-comma-multiple.js b/js/src/tests/test262/language/statements/async-generator/params-trailing-comma-multiple.js
new file mode 100644
index 0000000000..6bd7572487
--- /dev/null
+++ b/js/src/tests/test262/language/statements/async-generator/params-trailing-comma-multiple.js
@@ -0,0 +1,40 @@
+// |reftest| async
+// This file was procedurally generated from the following sources:
+// - src/function-forms/params-trailing-comma-multiple.case
+// - src/function-forms/default/async-gen-func-decl.template
+/*---
+description: A trailing comma should not increase the respective length, using multiple parameters (async generator function declaration)
+esid: sec-asyncgenerator-definitions-instantiatefunctionobject
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    AsyncGeneratorDeclaration : async [no LineTerminator here] function * BindingIdentifier
+        ( FormalParameters ) { AsyncGeneratorBody }
+
+        [...]
+        3. Let F be ! AsyncGeneratorFunctionCreate(Normal, FormalParameters, AsyncGeneratorBody,
+            scope, strict).
+        [...]
+
+
+    Trailing comma in the parameters list
+
+    14.1 Function Definitions
+
+    FormalParameters[Yield, Await] : FormalParameterList[?Yield, ?Await] ,
+---*/
+
+
+var callCount = 0;
+// Stores a reference `ref` for case evaluation
+async function* ref(a, b,) {
+  assert.sameValue(a, 42);
+  assert.sameValue(b, 39);
+  callCount = callCount + 1;
+}
+
+ref(42, 39, 1).next().then(() => {
+    assert.sameValue(callCount, 1, 'generator function invoked exactly once');
+}).then($DONE, $DONE);
+
+assert.sameValue(ref.length, 2, 'length is properly set');