// 36: Symbol.keyFor - retrieves a shared symbol key from the global symbol registry
// To do: make all tests pass, leave the assert lines unchanged!
// Follow the hints of the failure messages!

describe('`Symbol.keyFor()` gets the symbol key for a given symbol', function() {
  it('pass the symbol to `keyFor()` and you get its key', function() {
    const key = Symbol.keyFor(Symbol.for('foo'));
    assert.equal(key, 'foo');
  });
  it('local symbols are not in the runtime-wide registry', function() {
    // Hint: `Symbol()` creates a local symbol!
    const localSymbol = Symbol('foo');
    const key = Symbol.keyFor(localSymbol);
    assert.equal(key, void 0);
  });
  it('predefined symbols are not in the runtime-wide registry either', function() {
    const key = Symbol.keyFor(Symbol.iterator);
    assert.equal(key, void 0);
  });
  it('for non-Symbols throws an error', function() {
    function fn() {
      Symbol.keyFor(Symbol.for(sym));
    }
    assert.throws(fn);
  });
});