For creating active directory test accounts you can make use of the dsadd tool.
Dsadd is a command-line tool that is built into Windows Server 2008. It is available if you have the Active Directory Domain Services (AD DS) server role installed. To use dsadd, you must run the dsadd command from an elevated command prompt. To open an elevated command prompt, click Start, right-click Command Prompt, and then click Run as administrator.

Create an user with UserName 111111 and Password TestPassword40

dsadd user CN=111111,OU=TestUsers,DC=TEST,DC=local -pwd TestPassword40

See

http://technet2.microsoft.com/windowsserver/en/library/8d37ecb0-ac28-4e05-aa05-da82dc36b54b1033.mspx?mfr=true

Dsrm

Deleting users can be done by using the dsrm tool.
Deletes an object of a specific type or any general object from the directory.

Dsrm is a command-line tool that is built into Windows Server 2008. It is available if you have the Active Directory Domain Services (AD DS) or Active Directory Lightweight Directory Services (AD LDS) server role installed. To use dsrm, you must run the dsrm command from an elevated command prompt. To open an elevated command prompt, click Start, right-click Command Prompt, and then click Run as administrator.

Delete an user with UserName 111111

dsrm -noprompt CN=111111,OU=TestUsers,DC=TEST,DC=local