Simple cov gem missing untested files in Rails

Question

Using simple_cov gem in a Rails app, can we have the files that we are not testing included in the report?

• If yes, how?

• If no,

Answer 1

Eager load the whole Rails app when running tests suite with code coverage. Add Rails.application.eager_load! to spec_helper.rb.

Simplecov slows down tests that's why I use shell environment variable to turn it on. Usually my spec_helper.rb/rails_helper.rb looks something like this:

if ENV['COVERAGE']
  require 'simplecov'
  # some SimpleCov setup, e.g. formatters
  SimpleCov.start 'rails'
end

ENV['RAILS_ENV'] ||= 'test'
require 'spec_helper'
require File.expand_path('../../config/environment', __FILE__)
require 'rspec/rails'

Rails.application.eager_load! if ENV['COVERAGE']