All RSpec matchers should either work on a stopped or a running command

[maxmeyer]

Summary

Currently there's a mix of RSpec matchers in Aruba which either work on stopped or started commands:

• Expect command to be stopped upfront:
  • Make "have_output_size" accept a process, not a string #499
• Expect command to be running:
  • Make "have_output_size" accept a process, not a string #499
  • https://github.com/cucumber/aruba/blob/master/lib/aruba/matchers/command/have_output.rb#L22
  • https://github.com/cucumber/aruba/blob/master/lib/aruba/matchers/command/have_exit_status.rb#L23

Expected Behavior

We shall make sure all matchers follow some kind of an understandable guideline.

Current Behavior

Currently there's a mix of RSpec matchers in Aruba which either work on stopped or started commands.

Context & Motivation

We should avoid irritation on the users side.

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