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, that files should count to the coverage percentage, right ?

If you run the whole spec folder, then the report show every controller, helper, model coverage. For any specific test it only shows that test coverage. — Emu, Feb 27 '14 at 17:23
Using minitest and is not doing that, even when running the whole test folder. — Gustavo Semião-Lobo, Feb 28 '14 at 11:35

score 55 · Accepted Answer · answered Mar 26 '14 at 09:36

55

Try to edit your config/environments/test.rb and set this line:

config.eager_load = false

to true in this way the whole app is loaded and simplecov reads it.

answered Mar 26 '14 at 09:36

alex88

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this is the preferred solution and imho fixes the issue – Chris Hough Nov 27 '14 at 22:34
This fixed it for me. – Tomas Romero Jun 17 '15 at 20:03
I'm having the same problem as @koen. Does anyone know what the workaround is after that? I'm running with Minitest for what it's worth. – JWitter Sep 29 '17 at 18:23
It jumped my coverage from 73.xx% to 85.xx%, simply eager_loading. This is kind of funny. But gist is simplecov was considering all the code ran during eager_load phase also as covered. So no files in our project had 0% coverage anymore. Not a desired behavior i think. – Zia Ul Rehman Mughal Dec 01 '18 at 05:26

score 16 · Answer 2 · answered Jul 31 '15 at 10:01

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']

Actually better than the accepted answer as this doesn't affect the performance while testing without coverage. — secador de pelo, Jun 21 '16 at 12:04

score 5 · Answer 3 · answered Sep 19 '19 at 14:25

Since version 0.11.0 the files that should be tracked can be explicit set (Pull Request).

For a Rails app that would be:

require 'simplecov'
SimpleCov.start do
  track_files '{app,lib}/**/*.rb'
end

Or simple use:

require 'simplecov'
SimpleCov.start 'rails'

And the files to be tracked will be set by default (current related code).

Simple cov gem missing untested files in Rails

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