The done callbacks are an outdated mechanism to signal Jasmine that a
unit test is done, mostly in cases where a unit test needed to wait for
an asynchronous operation to complete before doing its assertions.
Nowadays a much better mechanism is in place for that, namely simply
passing an asynchronous function to Jasmine, so we don't need callbacks
anymore (which require more code and may be more difficult to reason
about).
In these particular cases though the done callbacks never had any real
use since nothing asynchronous happens in these places. Synchronous
functions don't need to use done callbacks since Jasmine simply knows
it's done when the function reaches its normal end, so we can safely get
rid of these callbacks. The telltale sign is if the done callback is
used unconditionally at the end of the function.
This is all done in an effort to over time get rid of all callbacks in
the unit test code.
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