Run newman run on ubuntu from puppet agent

edit

Folks, I have following in my PE master in suite.pp file, final goal is to run newman, but I am just trying command 'ls' currently but it fails

exec { 'newman run':              
    # (namevar) The command to execute  
    command  => 'ls',                
    path    => '/home/user/Downloads/f5-postman-workflows-develop/framework',
}

when I run on puupet agent it gives me error

root@ubuntu-agent:~# sudo puppet  agent -t
Info: Using configured environment 'production'                   
Info: Retrieving pluginfacts                
Info: Retrieving plugin              
Info: Loading facts                
Info: Caching catalog for ubuntu-desktop
Info: Applying configuration version '1486141942'            
Error: Could not find command 'ls'              
Error: /Stage[main]/Main/Node[ubuntu-agent]/Exec[newman run]/returns: change from notrun to 0 failed: Could not find command 'ls'
Notice: Applied catalog in 1.29 seconds 
root@ubuntu-agent:~#