GetOptionKit\Option::defaultValue PHP Method

    public function defaultValue($value)
    {
        $this->defaultValue = $value;
        return $this;
    }

 public function testDefaultValue()
 {
     $opt = new Option('z');
     $opt->defaultValue(10);
     $this->assertEquals(10, $opt->getValue());
     $this->assertEquals('-z[=10]', $opt->renderReadableSpec(true));
 }