In order to make the spec fail if the controller was not thread safe, it
uses breakpoints. One of those breakpoints was set for a method that has
now been removed.
I changed the method that is used for the breakpoint and changed `allow`
to `expect` so that this spec will fail if we remove that method as
well. Future version of Rspec will check if a mocked method actually
exists but our version just mocks it anyway. This is one way how specs
can become invalid after refactoring.
