Faster tests 1 - ability_spec.rb

[jrhoads]

Purpose

Reduces the total clock time for ability_spec.rb from 21 minutes on a local dev environment, down to 10 seconds in a local dev environment. Hopefully this will reduce the amount of time spent on the parallel test suite as well as the overall test runtime.

closes: #1243

Approach

There are three parts to this:

1. Skip elasticsearch setup-teardown where not used
2. Skip prefix allocation setup-teardown where not used
3. Use fixtures with build instead of create where possible to skip db connections and post-creation hooks.

Learning

This is a great blogpost that lead me to several of the insights in this PR.

Types of changes

• Bug fix (non-breaking change which fixes an issue)

• New feature (non-breaking change which adds functionality)

• Breaking change (fix or feature that would cause existing functionality to change)

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• Offer suggestions on how to improve code e.g. simplification or expanding clarity.
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