1 files changed, 34 insertions, 0 deletions
diff --git a/js/src/tests/non262/misc/explicit-undefined-optional-argument.js b/js/src/tests/non262/misc/explicit-undefined-optional-argument.js
new file mode 100644
index 0000000000..f861ccfdb1
--- /dev/null
+++ b/js/src/tests/non262/misc/explicit-undefined-optional-argument.js
@@ -0,0 +1,34 @@
+// Any copyright is dedicated to the Public Domain.
+// http://creativecommons.org/licenses/publicdomain/
+
+var BUGNUMBER = 373118;
+var summary =
+  'Properly handle explicitly-undefined optional arguments to a bunch of ' +
+  'functions';
+
+print(BUGNUMBER + ": " + summary);
+
+//-----------------------------------------------------------------------------
+
+var a;
+
+a = "abc".slice(0, undefined);
+assertEq(a, "abc");
+
+a = "abc".substr(0, undefined);
+assertEq(a, "abc");
+
+a = "abc".substring(0, undefined);
+assertEq(a, "abc");
+
+a = [1, 2, 3].slice(0, undefined);
+assertEq(a.join(), '1,2,3');
+
+a = [1, 2, 3].sort(undefined);
+assertEq(a.join(), '1,2,3');
+
+assertEq((20).toString(undefined), '20');
+
+//-----------------------------------------------------------------------------
+
+reportCompare(true, true);