In software development, testing is usually required before release to the general public. In-house developers often test the software in what is known as 'Beta' testing which is often performed under a debugger or with hardware-assisted debugging to catch bugs quickly.
It can then be handed over to testing staff for additional inspection in an environment similar to how it was intended to be used. This technique is known as black box testing. This is often known as the second stage of Beta testing.