1 files changed, 61 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/expressions/async-arrow-function/dflt-params-arg-val-undefined.js b/js/src/tests/test262/language/expressions/async-arrow-function/dflt-params-arg-val-undefined.js
new file mode 100644
index 0000000000..f78735f5b6
--- /dev/null
+++ b/js/src/tests/test262/language/expressions/async-arrow-function/dflt-params-arg-val-undefined.js
@@ -0,0 +1,61 @@
+// |reftest| async
+// This file was procedurally generated from the following sources:
+// - src/function-forms/dflt-params-arg-val-undefined.case
+// - src/function-forms/default/async-arrow-function.template
+/*---
+description: Use of initializer when argument value is `undefined` (async arrow function expression)
+esid: sec-async-arrow-function-definitions
+features: [default-parameters, async-functions]
+flags: [generated, async]
+info: |
+    14.7 Async Arrow Function Definitions
+
+    AsyncArrowFunction :
+      ...
+      CoverCallExpressionAndAsyncArrowHead => AsyncConciseBody
+
+    AsyncConciseBody :
+      { AsyncFunctionBody }
+
+    ...
+
+    Supplemental Syntax
+
+    When processing an instance of the production AsyncArrowFunction :
+    CoverCallExpressionAndAsyncArrowHead => AsyncConciseBody the interpretation of
+    CoverCallExpressionAndAsyncArrowHead is refined using the following grammar:
+
+    AsyncArrowHead :
+      async ArrowFormalParameters
+
+
+    14.1.19 Runtime Semantics: IteratorBindingInitialization
+
+    FormalsList : FormalsList , FormalParameter
+
+    [...]
+    23. Let iteratorRecord be Record {[[Iterator]]:
+        CreateListIterator(argumentsList), [[Done]]: false}.
+    24. If hasDuplicates is true, then
+        [...]
+    25. Else,
+        a. Perform ? IteratorBindingInitialization for formals with
+           iteratorRecord and env as arguments.
+    [...]
+
+---*/
+
+
+var callCount = 0;
+
+// Stores a reference `ref` for case evaluation
+var ref = async (fromLiteral = 23, fromExpr = 45, fromHole = 99) => {
+  assert.sameValue(fromLiteral, 23);
+  assert.sameValue(fromExpr, 45);
+  assert.sameValue(fromHole, 99);
+  callCount = callCount + 1;
+};
+
+ref(undefined, void 0).then(() => {
+  assert.sameValue(callCount, 1, 'async arrow function invoked exactly once')
+}).then($DONE, $DONE);