It looks like you got this from a blog on Python unit testing here
The problem with the test seems to be that the test will pass when in reality it should not
The blog is about Test Driven Development where the test suite is used to ensure the underlying code is doing what it's supposed to do. TDD is more a feature of Ruby and Rails and is becoming more adapted for Python.
The fact that the title was named Threat or Menace is the directed towards the test itself:
when the actual test is supposed to be
which is the method supplied by Python Mock Library for server testing (in this case). However, the misspelling can still cause the test to pass even though there is a typo.
Which is not the best thing to happen
These oddities can happen when monkey patching is involved which seems to be the case.
[NB: I am not a Python person]