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Refactor CommandLine.run to allow it to be more cleanly customised

Created by: benhoskings

This refactor makes two changes, both of which are useful from gems like test-queue.

  • It separates spec setup and spec running into their own methods, making them callable separately. This is useful because in test-queue and its ilk, the setup is done once in the master, but the specs are run in each worker.
  • It parameterises the list of specs to be run. This makes customising that list clean (in the test-queue case, passing an iterator that reads example groups from a socket).

(This patch doesn't change any externally called methods.)

What does everyone think -- would this be a reasonable change?

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