1 files changed, 19 insertions, 0 deletions
diff --git a/js/src/tests/non262/Function/method-has-duplicated.js b/js/src/tests/non262/Function/method-has-duplicated.js
new file mode 100644
index 0000000000..dc0a9dfb42
--- /dev/null
+++ b/js/src/tests/non262/Function/method-has-duplicated.js
@@ -0,0 +1,19 @@
+// Make sure duplicated name is allowed in non-strict.
+function f0(a) {
+}
+
+// SyntaxError should be thrown if method definition has duplicated name.
+assertThrowsInstanceOf(() => eval(`
+({
+  m1(a, a) {
+  }
+});
+`), SyntaxError);
+assertThrowsInstanceOf(() => eval(`
+({
+  m2(a, ...a) {
+  }
+});
+`), SyntaxError);
+
+reportCompare(0, 0, 'ok');