This allows clients of a Command to inject logic by means of an anonymous
function.
This provides the flexibility to use custom logic in a command without
subclassing a command, while still allowing the use of the command library.
eg: $command = new Closure(function() {echo "hello world";});
$command->execute();//echoes 'hello world'
public function testClosureCommandMultipleArguments()
{
//multiple arguments for closure
$output;
$input = 5;
$closure = function (&$output, $input) {
$output = $input;
};
$command = new Closure($closure, array(&$output, $input));
$this->assertNull($output);
$command->execute();
$this->assertEquals(5, $output);
}
