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-rw-r--r--js/src/tests/non262/lexical-environment/unscopables-proxy.js46
1 files changed, 46 insertions, 0 deletions
diff --git a/js/src/tests/non262/lexical-environment/unscopables-proxy.js b/js/src/tests/non262/lexical-environment/unscopables-proxy.js
new file mode 100644
index 0000000000..fcf241ee46
--- /dev/null
+++ b/js/src/tests/non262/lexical-environment/unscopables-proxy.js
@@ -0,0 +1,46 @@
+// Object operations are performed in the right order, as observed by proxies.
+
+let log = [];
+function LoggingProxyHandlerWrapper(name, handler={}) {
+ return new Proxy(handler, {
+ get(t, id) {
+ let method = handler[id];
+ return function (...args) {
+ log.push([name + "." + id, ...args.filter(v => typeof v !== "object")]);
+ if (method === undefined)
+ return Reflect[id].apply(null, args);
+ return method.apply(this, args);
+ };
+ }
+ });
+}
+
+function LoggingProxy(name, target) {
+ return new Proxy(target, new LoggingProxyHandlerWrapper(name));
+}
+
+let proto = {x: 44};
+let proto_proxy = new LoggingProxy("proto", proto);
+let unscopables = {x: true};
+let unscopables_proxy = new LoggingProxy("unscopables", {x: true});
+let env = Object.create(proto_proxy, {
+ [Symbol.unscopables]: { value: unscopables_proxy }
+});
+let env_proxy = new LoggingProxy("env", env);
+
+let x = 11;
+function f() {
+ with (env_proxy)
+ return x;
+}
+
+assertEq(f(), 11);
+
+assertDeepEq(log, [
+ ["env.has", "x"],
+ ["proto.has", "x"],
+ ["env.get", Symbol.unscopables],
+ ["unscopables.get", "x"]
+]);
+
+reportCompare(0, 0);