unit-test

We need a page in the docs that tell users that to mock they should use from unittest import mock.

We should note that the mock.patch decorators don't currently work, and that we need to use the context managers instead.

After upgrading from v1.0 to v1.2 I saw that a test suite which ran without issues before, now had a lot of cycle overruns. After some investigation I noticed that there is a parameter to set the maximum number of assertions. For v1.0 this was at 500 and for v1.2 it is at 1000. Even when I set the parameter the same for both versions, v1.0 had no issue with cycle overruns, but v1.2 did. Are assert