[PR] Tests for last-seen state calculation and comparison

[kopf-archiver]

A pull request by nolar at 2019-06-01 13:17:22+00:00
Original URL: zalando-incubator/kopf#91
Merged by nolar at 2019-06-13 09:19:57+00:00

Issue : #13

Add tests for last-seen state (calculation and comparison).

The last seen state is used to detect the causes when something was changed (and what specifically), or to detect of the object is completely new (no previous seen state).

Partially, this is tested in the causation tests (indirectly). But there, it tests for how the states & diffs are used, without testing the details on the field level, and not all functions are fully tested.

The diff calculation (between old & new states) is left aside, as there are separate tests for it in /tests/diffs/.