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-rw-r--r--js/src/tests/ecma_6/Object/defineProperty-proxy.js54
1 files changed, 54 insertions, 0 deletions
diff --git a/js/src/tests/ecma_6/Object/defineProperty-proxy.js b/js/src/tests/ecma_6/Object/defineProperty-proxy.js
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+++ b/js/src/tests/ecma_6/Object/defineProperty-proxy.js
@@ -0,0 +1,54 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/ */
+
+// Test details of the implementation of ToPropertyDescriptor exposed to scripts
+// thanks to scriptable proxies.
+
+// A LoggingProxy object logs certain operations performed on it.
+var log = [];
+function LoggingProxy(target) {
+ return new Proxy(target, {
+ has: function (t, id) {
+ log.push("has " + id);
+ return id in t;
+ },
+ get: function (t, id) {
+ log.push("get " + id);
+ return t[id];
+ }
+ });
+}
+
+// Tragically, we use separate code to implement Object.defineProperty on
+// arrays and on proxies. So run the test three times.
+var testSubjects = [
+ {},
+ [],
+ new Proxy({}, {})
+];
+
+for (var obj of testSubjects) {
+ log = [];
+
+ // Object.defineProperty is one public method that performs a
+ // ToPropertyDescriptor call.
+ Object.defineProperty(obj, "x", new LoggingProxy({
+ enumerable: true,
+ configurable: true,
+ value: 3,
+ writable: true
+ }));
+
+ // It should have performed exactly these operations on the proxy, in this
+ // order. See ES6 rev 24 (2014 April 27) 6.2.4.5 ToPropertyDescriptor.
+ assertDeepEq(log, [
+ "has enumerable", "get enumerable",
+ "has configurable", "get configurable",
+ "has value", "get value",
+ "has writable", "get writable",
+ "has get",
+ "has set"
+ ]);
+}
+
+reportCompare(0, 0);