From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001 From: "Matt A. Tobin" Date: Fri, 2 Feb 2018 04:16:08 -0500 Subject: Add m-esr52 at 52.6.0 --- .../ecma_6/Function/configurable-length-builtins.js | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) create mode 100644 js/src/tests/ecma_6/Function/configurable-length-builtins.js (limited to 'js/src/tests/ecma_6/Function/configurable-length-builtins.js') diff --git a/js/src/tests/ecma_6/Function/configurable-length-builtins.js b/js/src/tests/ecma_6/Function/configurable-length-builtins.js new file mode 100644 index 000000000..f28eaae15 --- /dev/null +++ b/js/src/tests/ecma_6/Function/configurable-length-builtins.js @@ -0,0 +1,21 @@ +/* Any copyright is dedicated to the Public Domain. + * http://creativecommons.org/licenses/publicdomain/ */ + +// Deleting .length from a variety of builtin functions works as expected. +for (var fun of [Math.sin, Array.prototype.map, eval]) { + assertEq(delete fun.length, true); + assertEq(fun.hasOwnProperty("length"), false); + assertEq("length" in fun, true); // still inheriting Function.prototype.length + assertEq(fun.length, 0); + + // The inherited property is nonwritable, so assigning still fails + // (silently, in sloppy mode). + fun.length = Math.hypot; + assertEq(fun.length, 0); + + // It can be shadowed via defineProperty. + Object.defineProperty(fun, "length", {value: Math.hypot}); + assertEq(fun.length, Math.hypot); +} + +reportCompare(0, 0, 'ok'); -- cgit v1.2.3