CurrencyValidator example

    protected function tearDown(): void
    {
        parent::tearDown();

        \Locale::setDefault($this->defaultLocale);
    }

    protected function createValidator(): CurrencyValidator
    {
        return new CurrencyValidator();
    }

    public function testNullIsValid()
    {
        $this->validator->validate(null, new Currency());

        $this->assertNoViolation();
    }

    public function testEmptyStringIsValid()
    {