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What github issue is this PR for, if any?
Resolves #453
What does this code do, and why?
added some specs for comments controller
added specs to the admin controller
removed duplicated simplecov config in rails bin
improved simplecov config in spec helper to add coverage groups (models, controllers...)
How is this code tested?
Are any database migrations required by this change?
no
Are there any configuration or environment changes needed?
no
Screenshots please :)