E000 calls from SIM-less mobiles has been a thing here for a while. In relation to testing 000/112 services, there is a test procedure which service providers follow (it basically involves calling the actual 000 number and repeating a specific "test message" to the operator).
If the volume of test calls is expected to be high, there is a specific person/department within Telstra who you will need approval from prior to conducting those tests on a larger scale. They will advise the appropriate time for the test to occur and notify the various emergency call centres ahead of time.
Also to keep in mind, when you call 000/112 in Australia, you are connected to a Telstra operator first, not an emergency service. Then depending on the state, suburb and service requested, they will divert you to the appropriate agency to handle the call. That can be anyone from state Police, Fire Brigade or Ambulance to volunteer organisations such as the Rural Fire Service, Volunteer Rescue Association etc...
If there is no verbal response from the caller, it is forwarded to the Police as what is known as a "Five five call". The reason for the raised dimple on the "5" key on almost every phone with actual buttons is that you can press that twice (or if requested by the operator, respond to questions using only that key) and you don't need to see or look at the keypad to do it. Examples for this might be someone who partially incapacitated, cannot speak (either due to the nature of emergency, a medical condition or if they are under duress), visually impaired or some other reason which prevents someone from answering questions verbally but still requires an emergency response. Your location is determined by the subscriber details and/or for mobile phones, this is done via "Push MoLI" or even using the GPS in your handset in some cases.
SIM-less emergency calls are more important than ever these days since a large majority of the population is using VoIP services as their landlines (and this number is only increasing with the adoption of NBN connections). VoIP services aren't guaranteed to connect you to emergency services as even a mis-configuration would prevent you from doing so. Back in the day of POTS services, even if you had no dial-tone (due to a suspended service), you could still call 000.