Webmozart\Console\Adapter\ArgsInput::getArgument PHP Method

    public function getArgument($name)
    {
        return $this->args ? $this->args->getArgument($name) : null;
    }

 public function testSetArgument()
 {
     $inputArgs = new ArgsInput($this->rawArgs, $this->args);
     $inputNoArgs = new ArgsInput($this->rawArgs);
     $inputArgs->setArgument('argument1', 'value1');
     $inputNoArgs->setArgument('argument1', 'value1');
     $this->assertSame('value1', $inputArgs->getArgument('argument1'));
     $this->assertNull($inputNoArgs->getArgument('argument1'));
 }