Webmozart\Console\Api\Config\OptionCommandConfig::setPreferShortName PHP Method

    public function setPreferShortName()
    {
        if (null === $this->shortName) {
            throw new LogicException('No short name is set.');
        }
        $this->longNamePreferred = false;
        return $this;
    }

 public function testSetShortNameToNullSetsLongNameToBePreferred()
 {
     $this->config->setShortName('d');
     $this->config->setPreferShortName();
     $this->config->setShortName(null);
     $this->assertTrue($this->config->isLongNamePreferred());
     $this->assertFalse($this->config->isShortNamePreferred());
 }