sidekiq-bulk's push_bulk can either accept arguments directly or run them
through a block.
Setting expectations on the result of evaluating the blocks allows testing
more code (the block itself) and the test is moved closer to the *interface*
of the tested code than its precise implementation.
* Change move handler to carry blocks and mutes over
When user A blocks user B and B moves to a new account C, make A block C
accordingly.
Note that it only works if A's instance is aware of the Move, that is,
if B is on A's instance or has followers there.
* Also notify instances with known people blocking you when moving
* Add automatic account notes when blocking/muting an account that had no note
