When using the Register a Company in a testing environment, you can use the 'name' parameter sent in the body to set the expected outcome of the registration in the following way:

name = 'registered' will result in a Company being successfully registered
name = 'failed' will result in a failed Company registration
any other name will leave the company with the status='in process' indefinitely.

Recall that status updates trigger webhook notifications or can be retrieved by using the Get a Registered Company.