Enable Split By Test Example by default in RSpec

[3v0k4]

Story

https://trello.com/c/xBllV4js/589-enable-sbte-by-default

Description

Enable KNAPSACK_PRO_RSPEC_SPLIT_BY_TEST_EXAMPLES by default.

This should improve the speed of your builds, but you can disable it with KNAPSACK_PRO_RSPEC_SPLIT_BY_TEST_EXAMPLES=false.

Also, this PR adds support for RSpec tags when using RSpec split by examples.

Checklist reminder

• You added the changes to the UNRELEASED section of the CHANGELOG.md, including the needed bump (ie, patch, minor, major)
• You follow the architecture outlined below for RSpec in Queue Mode, which is a work in progress (feel free to propose changes):
  • Pure: lib/knapsack_pro/pure/queue/rspec_pure.rb contains pure functions that are unit tested.
  • Extension: lib/knapsack_pro/extensions/rspec_extension.rb encapsulates calls to RSpec internals and is integration and e2e tested.
  • Runner: lib/knapsack_pro/runners/queue/rspec_runner.rb invokes the pure code and the extension to produce side effects, which are integration and e2e tested.

[3v0k4]

There's an important thing missing: the formatters are removed from the rspec options but not the ones coming from configuration files (eg, .rspec).

I think it would be simpler to allow formatters without manually parsing them out (fragile code). This would make all the formatters w/o --out print to stdout, but we could either:

• Silence stdout but not stderr > /dev/null; we need to ensure we are not silencing anything that is needed for debug (in theory, errors should be printed to stderr, but most people throw everything to stdout)
• Append --out /dev/null (or something like it) to all the existing formatters; we need to test what happens with -f json -o /dev/null -f json -o /path/to/report
• Other ideas?

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Are we also supporting --example and --example-matches with this PR?

[ArturT]

Are we also supporting --example and --example-matches with this PR?

Yes.