This chapter was about setting the basics on mocking.
It starts talking about interaction testing, and how when we are using mocks we want to make sure that certain interactions have occurred, and not necessarily the result ( that would be state based testing).
Then we move on to the definition of a mock object, in other words it means that we define if the test has passed or failed based on the mock object.
In general it was a really short chapter, maybe it could have been merged with chapter 3.
We discussed this chapter the 5th of October.