This replaces the test repo introduced in #610 with one created on the
fly in the test.

I've switched from GPG to SSH signing to minimise the likelihood that
we'll need extra dependencies on CI or other contributors' machines.

I've also removed some of the commit metadata assertions that didn't
feel particularly necessary, and this allowed me to reduce the setup
steps for clarity.

Signed-off-by: Simon Coffey <simon.coffey@futurelearn.com>

This commit aims to make working with the test suite easier in two ways:

  1. make individual tests easier to run
  2. clarify use of fixture repo clones

To do this it takes the following steps:

  * Eliminate complexity due to regular changes of working directory
  * Make individual test files runnable from the command line using
    the new bin/test executable
  * Extract constants to refer to fixture locations
  * Reduce unnecessary cloning of certain fixture repos
  * Begin using helper methods to clarify which tests are using which
    fixture repo

Signed-off-by: Simon Coffey <simon.coffey@futurelearn.com>

* Remove nested arrays from global_opts
* Pass options to #command as keyword args instead of a hash
* Enforce that nested arrays can't be passed to Lib#command in the opts parameter and fix callers to not do this
* Collapse the cmd and opts arguments to Lib#command into one argument and fix callers

Signed-off-by: James Couball <jcouball@yahoo.com>

)

Signed-off-by: James Couball <jcouball@yahoo.com>

Signed-off-by: James Couball <jcouball@yahoo.com>

Signed-off-by: James Couball <jcouball@yahoo.com>

…tion to grep (#624)

* grep: multiple path_limiters and extended_regexp

Signed-off-by: Bryce Lanham <blanham@gmail.com>

* Document Base#grep parameters

Signed-off-by: James Couball <jcouball@yahoo.com>

Signed-off-by: James Couball <jcouball@yahoo.com>