JavaScriptCore-7601.1.46.3.tar.gz

[apple/javascriptcore.git] / tests / stress / iterators-shape.js

diff --git a/tests/stress/iterators-shape.js b/tests/stress/iterators-shape.js
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+++ b/tests/stress/iterators-shape.js
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+// This test checks the shape of builtin iterators.
+
+function iteratorShape(iter) {
+    if (iter.hasOwnProperty('next'))
+        throw "Error: iterator should not have next method.";
+    if (!iter.__proto__.hasOwnProperty('next'))
+        throw "Error: iterator prototype should have next method.";
+    if (typeof iter.__proto__.next !== "function")
+        throw "Error: iterator prototype should have next method.";
+}
+
+function sameNextMethods(iterators) {
+    var iterator = iterators[0];
+    for (var i = 1; i < iterators.length; ++i) {
+        if (iterator.next !== iterators[i].next)
+            throw "Error: next method is not the same.";
+    }
+}
+
+var array = ['Cocoa', 'Cappuccino', 'The des Alizes', 'Matcha', 'Kilimanjaro'];
+var iterator = array[Symbol.iterator]();
+iteratorShape(iterator);
+
+var keyIterator = array.keys();
+iteratorShape(keyIterator);
+
+var keyValueIterator = array.entries();
+iteratorShape(keyValueIterator);
+
+sameNextMethods([array[Symbol.iterator](), array.keys(), array.entries()]);
+
+var set = new Set(['Cocoa', 'Cappuccino', 'The des Alizes', 'Matcha', 'Kilimanjaro']);
+var iterator = set[Symbol.iterator]();
+iteratorShape(iterator);
+
+var keyIterator = set.keys();
+iteratorShape(keyIterator);
+
+var keyValueIterator = set.entries();
+iteratorShape(keyValueIterator);
+
+sameNextMethods([set[Symbol.iterator](), set.keys(), set.entries()]);
+
+var map = new Map();
+[
+    [ 'Cocoa', 2, ],
+    [ 'Cappuccino', 0 ],
+    [ 'The des Alizes', 3 ],
+    [ 'Matcha', 2 ],
+    [ 'Kilimanjaro', 1]
+].forEach(function ([ key, value ]) {
+    map.set(key, value);
+});
+var iterator = map[Symbol.iterator]();
+iteratorShape(iterator);
+
+var keyIterator = map.keys();
+iteratorShape(keyIterator);
+
+var keyValueIterator = map.entries();
+iteratorShape(keyValueIterator);
+
+sameNextMethods([map[Symbol.iterator](), map.keys(), map.entries()]);