ladybird/Userland/Libraries/LibJS/Tests/builtins/Symbol/Symbol.js

test("basic functionality", () => {
    const s1 = Symbol("foo");
    const s2 = Symbol("foo");

    expect(s1).not.toBe(s2);
    expect(s1.description).toBe("foo");
    expect(s2.description).toBe("foo");

    s1.description = "bar";
    expect(s1.description).toBe("foo");

    expect(typeof s1).toBe("symbol");
});

test("constructing symbol from symbol is an error", () => {
    expect(() => {
        Symbol(Symbol("foo"));
    }).toThrowWithMessage(TypeError, "Cannot convert symbol to string");
});

test("setting new properties on a symbol is an error in strict mode", () => {
    "use strict";
    var symbol = Symbol("foo");
    expect(() => {
        symbol.bar = 42;
    }).toThrowWithMessage(TypeError, "Cannot set property 'bar' of symbol 'Symbol(foo)'");
});