JavaScriptCore-7601.1.46.3.tar.gz

[apple/javascriptcore.git] / tests / stress / array-find-does-not-lookup-twice.js

diff --git a/tests/stress/array-find-does-not-lookup-twice.js b/tests/stress/array-find-does-not-lookup-twice.js
new file mode 100644 (file)
index 0000000..87f767f
--- /dev/null
+++ b/tests/stress/array-find-does-not-lookup-twice.js
@@ -0,0 +1,47 @@
+function shouldBe(actual, expected) {
+    if (actual !== expected)
+        throw new Error('bad value: ' + actual);
+}
+
+function shouldThrow(func, message) {
+    var error = null;
+    try {
+        func();
+    } catch (e) {
+        error = e;
+    }
+    if (!error)
+        throw new Error("not thrown.");
+    if (String(error) !== message)
+        throw new Error("bad error: " + String(error));
+}
+
+var array = new Array(10);
+
+for (var i = 0; i < 10; ++i) {
+    (function (index) {
+        var seenOnce = false;
+        Object.defineProperty(array, index, {
+            get() {
+                if (seenOnce)
+                    throw new Error('get is called.' + index);
+                seenOnce = true;
+                return index;
+            }
+        });
+    }(i));
+}
+
+shouldBe(array.length, 10);
+
+// Doesn't throw any errors.
+var findValue = array.find(function (value) {
+    return value === 9;
+});
+shouldBe(findValue, 9);
+
+for (var i = 0; i < 10; ++i) {
+    shouldThrow(function () {
+        var value = array[i];
+    }, "Error: get is called." + i);
+}