hasArgument() public method

You can either pass the name of the argument or the 0-based position of the argument.
public hasArgument ( string | integer $name, boolean $includeBase = true ) : boolean
$name string | integer The argument name or its 0-based position in the argument list.
$includeBase boolean Whether to include arguments in the base format in the search.
return boolean Returns `true` if the argument with the given name or position could be found and `false` otherwise.
 /**
  * @expectedException \InvalidArgumentException
  */
 public function testHasArgumentFailsIfIncludeBaseNoBoolean()
 {
     $this->builder->hasArgument('argument', 1234);
 }