1 files changed, 102 insertions, 0 deletions
diff --git a/testing/web-platform/tests/webstorage/set.window.js b/testing/web-platform/tests/webstorage/set.window.js
new file mode 100644
index 0000000000..8e671d2ded
--- /dev/null
+++ b/testing/web-platform/tests/webstorage/set.window.js
@@ -0,0 +1,102 @@
+["localStorage", "sessionStorage"].forEach(function(name) {
+    [9, "x"].forEach(function(key) {
+        test(function() {
+            var expected = "value for " + this.name;
+            var value = expected;
+
+            var storage = window[name];
+            storage.clear();
+
+            assert_equals(storage[key], undefined);
+            assert_equals(storage.getItem(key), null);
+            assert_equals(storage[key] = value, value);
+            assert_equals(storage[key], expected);
+            assert_equals(storage.getItem(key), expected);
+        }, "Setting property for key " + key + " on " + name);
+
+        test(function() {
+            var expected = "value for " + this.name;
+            var value = {
+                toString: function() { return expected; }
+            };
+
+            var storage = window[name];
+            storage.clear();
+
+            assert_equals(storage[key], undefined);
+            assert_equals(storage.getItem(key), null);
+            assert_equals(storage[key] = value, value);
+            assert_equals(storage[key], expected);
+            assert_equals(storage.getItem(key), expected);
+        }, "Setting property with toString for key " + key + " on " + name);
+
+        test(function() {
+            var proto = "proto for " + this.name;
+            Storage.prototype[key] = proto;
+            this.add_cleanup(function() { delete Storage.prototype[key]; });
+
+            var value = "value for " + this.name;
+
+            var storage = window[name];
+            storage.clear();
+
+            assert_equals(storage[key], proto);
+            assert_equals(storage.getItem(key), null);
+            assert_equals(storage[key] = value, value);
+            // Hidden because no [LegacyOverrideBuiltIns].
+            assert_equals(storage[key], proto);
+            assert_equals(Object.getOwnPropertyDescriptor(storage, key), undefined);
+            assert_equals(storage.getItem(key), value);
+        }, "Setting property for key " + key + " on " + name + " with data property on prototype");
+
+        test(function() {
+            var proto = "proto for " + this.name;
+            Storage.prototype[key] = proto;
+            this.add_cleanup(function() { delete Storage.prototype[key]; });
+
+            var value = "value for " + this.name;
+            var existing = "existing for " + this.name;
+
+            var storage = window[name];
+            storage.clear();
+
+            storage.setItem(key, existing);
+
+            // Hidden because no [LegacyOverrideBuiltIns].
+            assert_equals(storage[key], proto);
+            assert_equals(Object.getOwnPropertyDescriptor(storage, key), undefined);
+            assert_equals(storage.getItem(key), existing);
+            assert_equals(storage[key] = value, value);
+            assert_equals(storage[key], proto);
+            assert_equals(Object.getOwnPropertyDescriptor(storage, key), undefined);
+            assert_equals(storage.getItem(key), value);
+        }, "Setting property for key " + key + " on " + name + " with data property on prototype and existing item");
+
+        test(function() {
+            var storage = window[name];
+            storage.clear();
+
+            var proto = "proto getter for " + this.name;
+            Object.defineProperty(Storage.prototype, key, {
+                "get": function() { return proto; },
+                "set": this.unreached_func("Should not call [[Set]] on prototype"),
+                "configurable": true,
+            });
+            this.add_cleanup(function() {
+                delete Storage.prototype[key];
+                delete storage[key];
+                assert_false(key in storage);
+            });
+
+            var value = "value for " + this.name;
+
+            assert_equals(storage[key], proto);
+            assert_equals(storage.getItem(key), null);
+            assert_equals(storage[key] = value, value);
+            // Property is hidden because no [LegacyOverrideBuiltIns].
+            assert_equals(storage[key], proto);
+            assert_equals(Object.getOwnPropertyDescriptor(storage, key), undefined);
+            assert_equals(storage.getItem(key), value);
+        }, "Setting property for key " + key + " on " + name + " with accessor property on prototype");
+    });
+});