Class: Evilution::Integration::RSpec::StateGuard::ConfigurationStreams

Inherits:
Object
  • Object
show all
Defined in:
lib/evilution/integration/rspec/state_guard/configuration_streams.rb

Overview

Restores the RSpec.configuration fields that ::RSpec::Core::Runner.run mutates on the shared singleton during an in-process mutation run (EV-dwqw / GH #1343):

- @color_mode    -- the run's args carry "--no-color", flipping it to :off,
                    which makes every SUBSEQUENT host example render its
                    progress dots without color (white instead of green).
- @output_stream -- Runner#setup swaps it to the run's StringIO whenever the
                    host's was $stdout.
- @error_stream  -- likewise pointed at the run's StringIO.

Forked runs never leak these (the mutation happens in a child that dies), but the in-process isolation path mutates the host’s own configuration. Restore by writing the ivars directly: configuration#output_stream= is guarded (it warns and no-ops once a reporter exists), so the public setter cannot put it back.

Constant Summary collapse

IVARS = 
%i[@color_mode @output_stream @error_stream].freeze

Instance Method Summary collapse

Instance Method Details

#release(captured) ⇒ Object

Restore exactly the pre-run state: ivars present at snapshot get their value back; ivars that were absent before but created by the run are removed, so a newly-defined ivar can’t leak into the host either.



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# File 'lib/evilution/integration/rspec/state_guard/configuration_streams.rb', line 33

def release(captured)
  return unless captured

  config = ::RSpec.configuration
  IVARS.each do |ivar|
    if captured.key?(ivar)
      config.instance_variable_set(ivar, captured[ivar])
    elsif config.instance_variable_defined?(ivar)
      config.remove_instance_variable(ivar)
    end
  end
end

#snapshot ⇒ Object 



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# File 'lib/evilution/integration/rspec/state_guard/configuration_streams.rb', line 23

def snapshot
  config = ::RSpec.configuration
  IVARS.each_with_object({}) do |ivar, acc|
    acc[ivar] = config.instance_variable_get(ivar) if config.instance_variable_defined?(ivar)
  end
end