mpyw\Co\Internal\CoOption::setDefault PHP Method

    public static function setDefault(array $options)
    {
        self::$defaults = self::validateOptions($options) + self::$defaults;
    }

 public function testStaticDefaults()
 {
     $def = ['throw' => false, 'pipeline' => true, 'multiplex' => false, 'interval' => 0.3, 'concurrency' => 1];
     CoOption::setDefault($def);
     $options = CoOption::getDefault();
     foreach ($def as $key => $value) {
         $this->assertEquals($value, $options[$key]);
     }
 }