CASA will not issue an NVFR to someone with an MECIR and meeting the requirements of a Night Rating without sitting the test with an Authorised Testing Officer or a CASA Delegate - the test is a requirement for the issue of that rating.
You can however fly at night under the VFR category if you have a current CIR/ME and meet the requirements, if you intend to do this please read the CAO and understand what you can and can't do...
http://www.casa.gov.au/download/orders/cao40/400201.pdf
...page 15, it does vary depending on whether you are flying under the charter or aerial work category.
They will however issue a PIFR if you have a current CIR/ME that is valid for two years since your last renewal. The PIFR does not allow you to fly at Night under the VFR category that is a privilege of the CIR and Copilot IR only. It allows you to fly at night under the IFR while opearting an aircraft in the private category (ie aerial work and charter are not allowed).