Method toString

test/parallel/test-util-format.js:194–194

()

// String format specifier including `toString` properties on the prototype.
{
  class Foo { toString() { return 'Bar'; } }
  assert.strictEqual(util.format('%s', new Foo()), 'Bar');
  assert.strictEqual(
    util.format('%s', Object.setPrototypeOf(new Foo(), null)),