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["localStorage", "sessionStorage"].forEach(function(name) {
test(function() {
var storage = window[name];
storage.clear();
assert_equals(storage.length, 0, "storage.length");
var builtins = ["key", "getItem", "setItem", "removeItem", "clear"];
var origBuiltins = builtins.map(function(b) { return Storage.prototype[b]; });
assert_array_equals(builtins.map(function(b) { return storage[b]; }), origBuiltins, "a");
builtins.forEach(function(b) { storage[b] = b; });
assert_array_equals(builtins.map(function(b) { return storage[b]; }), origBuiltins, "b");
assert_array_equals(builtins.map(function(b) { return storage.getItem(b); }), builtins, "c");
assert_equals(storage.length, builtins.length, "storage.length");
}, "Builtins in " + name);
});
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