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Test suite: background snapshot improvements

Originally created by Tails on #6094 (Redmine)

While background snapshots are invaluable for speeding up the test suite and not hammering the Tor authorities excessively with complete bootstraps, they do introduce some ugly code overhead and confusion:

  • There’s the need of the I save the state ... step at the end of the Background, which is pretty hackish.
  • Each "skippable" step needs an next if ... line around the top of the step.
  • In the previous point I say "around" the top, because sometimes input from a step are to be saved in some global variable to be accessible for subsequent steps, and then those assignments should happen before the next if .... It’s pretty confusing.

It’d be great if we could tag steps skippable and skip them when appropriate using something like an AroundStep('skippable’)@ hook, but vanilla cucumber supports neither tagging of steps nor such a hook (cucumber-cpp does, though). OTOH, with all that we’d be unable to save any input from the skipped steps, which probably would require some interesting workarounds (maybe using real $global variables instead of class variables will do?).

So the question is if we really can improve the situation. An AfterBackground('snapshot’)@ hook would at least be nice for killing the I save the state ... step in features tagged @snapshot. Can this be implemented using formatters, e.g. like our custom {After,Before}Feature hooks in features/support/extra_hooks.rb?

Feature Branch: test/6094-improved-snapshots

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Edited by import-from-Redmine
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