JSTests/stress/symbol-tostringtag.js

// This file tests the names of all the classes with builtin Symbol.toStringTags and Object.prototype.toString().

foo = { };
foo[Symbol.toStringTag] = "test the tag";

if (foo != "[object test the tag]")
    throw "failed on custom toStringTag";

function toStr(obj) {
    return Object.prototype.toString.call(obj);
}

function strName(str) { return "[object " + str + "]"; }

if (toStr(Symbol()) !== strName("Symbol"))
    throw "failed on Symbol";

if (toStr(Symbol.prototype) !== strName("Symbol"))
    throw "failed on Symbol.prototype";

objects = ["JSON", "Math"];

for (name of objects) {
    value = eval(name)
    if (toStr(value) !== strName(name))
        throw "failed on " + name;
}

iterators = ['Array', 'Map', 'Set', 'String'];

for (name of iterators) {
    value = eval('new ' + name + '()[Symbol.iterator]()');
    if (toStr(value) !== strName(name + ' Iterator'))
        throw 'failed on Iterator of ' + name;
    if (toStr(Object.getPrototypeOf(value)) !== strName(name + ' Iterator'))
        throw 'failed on Iterator.prototype of ' + name;
}

classes = { "ArrayBuffer": 10, "DataView": new ArrayBuffer(10), "Promise": function() { return 1 }, "Set": undefined, "WeakMap": undefined, "WeakSet": undefined };

for (name in classes) {
    value = eval(name);
    if (toStr(new value(classes[name])) !== strName(name))
        throw "failed on new object of " + name;
    if (toStr(value.prototype) !== strName(name))
        throw "failed on prototype of " + name;
}