What is the fourfold test for partners wishing to migrate to New Zealand?

The fourfold test is the basis on which an immigration officer will make their decision with regards to establishing whether the partnership qualifies under the New Zealand Partners Category
The immigration officer is required to gather and examine evidence, such as documentation and interviews, until they are satisfied the following 4 elements are satisfied or not:

* Credibility- that both the partner and applicant are credible in the evidence they present
* Living together – barring any special circumstance preventing it, that the partners are living together
* That the partnership is genuine – the reasons for entering into and remaining in the partnership are genuine
* That the partnership is stable – the partnership is exclusive and of a long term nature