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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /js/src/tests/js1_8_5/regress/regress-591846.js
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'js/src/tests/js1_8_5/regress/regress-591846.js')
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diff --git a/js/src/tests/js1_8_5/regress/regress-591846.js b/js/src/tests/js1_8_5/regress/regress-591846.js
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+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ */
+
+function check(obj, name, value, readonly) {
+ // Start with a non-configurable, writable data property implemented via
+ // js::PropertyOp getter and setter.
+ var pd = Object.getOwnPropertyDescriptor(obj, name);
+
+ assertEq(pd.configurable, false, "non-configurable " + name);
+ assertEq(pd.writable, !readonly, "writable " + name);
+
+ try {
+ // Do not allow a transition from js::PropertyOp to writable js::Value
+ // data property.
+ Object.defineProperty(obj, name, {writable: true});
+ assertEq(0, 1);
+ } catch (e) {
+ assertEq('' + e, "TypeError: can't redefine non-configurable property '" + name + "'");
+ }
+
+ if (!readonly) {
+ try {
+ // Do not allow the property denoted by name to become a true data
+ // property via a descriptor that preserves the native property's
+ // writable attribute.
+ Object.defineProperty(obj, name, {value: value});
+ assertEq(0, 1);
+ } catch (e) {
+ assertEq('' + e, "TypeError: can't redefine non-configurable property '" + name + "'");
+ }
+ }
+
+ try {
+ // Do not allow the property to be frozen at some bogus value.
+ Object.defineProperty(obj, name, {value: "bogus", writable: false});
+ assertEq(0, 1);
+ } catch (e) {
+ assertEq('' + e, "TypeError: can't redefine non-configurable property '" + name + "'");
+ }
+
+ // Now make name non-writable.
+ Object.defineProperty(obj, name, {writable: false})
+
+ // Assert that the right getter result "stuck".
+ assertEq(obj[name], value);
+
+ // Test that it is operationally non-writable now.
+ obj[name] = "eek!";
+ assertEq(obj[name], value);
+}
+
+// Reset RegExp.leftContext to the empty string.
+/x/.test('x');
+
+var d = Object.getOwnPropertyDescriptor(RegExp, "leftContext");
+assertEq(d.set, undefined);
+assertEq(typeof d.get, "function");
+assertEq(d.enumerable, true);
+assertEq(d.configurable, false);
+assertEq(d.get.call(RegExp), "");
+
+reportCompare(0, 0, "ok");