1 files changed, 50 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/proxy/testDirectProxyGet3.js b/js/src/jit-test/tests/proxy/testDirectProxyGet3.js
new file mode 100644
index 000000000..e0acc3b3b
--- /dev/null
+++ b/js/src/jit-test/tests/proxy/testDirectProxyGet3.js
@@ -0,0 +1,50 @@
+load(libdir + "asserts.js");
+
+function testProxy(handlerReturn, prop, shouldThrow) {
+    var handler = { get: function () { return handlerReturn; } };
+    for (let p of [new Proxy(target, handler), Proxy.revocable(target, handler).proxy]) {
+        if (shouldThrow)
+            assertThrowsInstanceOf(function () { return p[prop]; }, TypeError);
+        else
+            assertEq(p[prop], handlerReturn);
+    }
+}
+
+/*
+ * Throw a TypeError if the trap reports a different value for a non-writable,
+ * non-configurable property
+ */
+var target = {};
+Object.defineProperty(target, 'foo', {
+    value: 'bar',
+    writable: false,
+    configurable: false
+});
+testProxy('baz', 'foo', true);
+/*
+ * Don't throw a TypeError if the trap reports the same value for a non-writable,
+ * non-configurable property
+ */
+testProxy('bar', 'foo', false);
+
+/*
+ * Don't throw a TypeError if the trap reports a different value for a writable,
+ * non-configurable property
+ */
+Object.defineProperty(target, 'prop', {
+    value: 'bar',
+    writable: true,
+    configurable: false
+});
+testProxy('baz', 'prop', false);
+
+/*
+ * Don't throw a TypeError if the trap reports a different value for a non-writable,
+ * configurable property
+ */
+Object.defineProperty(target, 'prop2', {
+    value: 'bar',
+    writable: false,
+    configurable: true
+});
+testProxy('baz', 'prop2', false);