1 files changed, 51 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/arguments-object/cls-decl-private-gen-meth-args-trailing-comma-single-args.js b/js/src/tests/test262/language/arguments-object/cls-decl-private-gen-meth-args-trailing-comma-single-args.js
new file mode 100644
index 0000000000..f14bdf279e
--- /dev/null
+++ b/js/src/tests/test262/language/arguments-object/cls-decl-private-gen-meth-args-trailing-comma-single-args.js
@@ -0,0 +1,51 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-single-args.case
+// - src/arguments/default/cls-decl-private-gen-meth.template
+/*---
+description: A trailing comma should not increase the arguments.length, using a single arg (class declaration private generator method)
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+features: [generators, class, class-methods-private]
+flags: [generated]
+info: |
+    9.4.4 Arguments Exotic Objects
+
+    Most ECMAScript functions make an arguments object available to their code. Depending upon the
+    characteristics of the function definition, its arguments object is either an ordinary object
+    or an arguments exotic object.
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+
+
+var callCount = 0;
+class C {
+  * #method() {
+    assert.sameValue(arguments.length, 1);
+    assert.sameValue(arguments[0], 42);
+    callCount = callCount + 1;
+  }
+
+  get method() {
+    return this.#method;
+  }
+}
+
+new C().method(42,).next();
+
+assert.sameValue(callCount, 1, 'method invoked exactly once');
+
+reportCompare(0, 0);