Rails and MiniTest: add additional folder

Question

I use Ruby 2 and Rails 4. I have a folder test/lib, where a few tests are located. But running rake test does not use them. Only the other tests (models, controllers, ...) are running.

Where do I have to add the lib folder?

I already tried MiniTest::Rails::Testing.default_tasks << 'lib', but I get NameError Exception: uninitialized constant MiniTest::Rails. I did not add the minitest gem to my Gemfile, because Ruby 2 uses it by default.

you can override the task `rake test` in `Rakefile` by creating a new task with executing `ruby -Ilib:test "test/lib/*" — Rajarshi Das, Sep 19 '13 at 12:33
The simplest solution for me is to use `rake test:all` instead of `rake test` — Bjoernsen, Sep 20 '13 at 07:27
For Rails 4.2 `rake test:all` is deprecated and will be removed in Rails 5. But `rake test` now works exactly the same. — Bjoernsen, Mar 26 '15 at 12:14

blowmage · Answer 1 · 2014-05-29T15:26:08.870

To use MiniTest::Rails::Testing.default_tasks << 'lib' you need to add the minitest-rails gem to your Gemfile. It is separate from Minitest and adds enables many Minitest features missing that are not enabled in Rails by default. And minitest-rails adds other features, such as creating rake tasks for all the directories that have tests. So without any changes to your Rakefile you can run things like this:

$ rake minitest:lib

Alternatively, to do this the old fashioned way, you can add the following to your Rakefile:

namespace :test do

  desc "Test lib source"
  Rake::TestTask.new(:lib) do |t|    
    t.libs << "test"
    t.pattern = 'test/lib/**/*_test.rb'
    t.verbose = true    
  end

end

Rake::Task[:test].enhance { Rake::Task["test:lib"].invoke }

This assumes you want to run your lib tests without using any database fixtures. If you want the fixtures and database transactions, then you should create the rake task with a dependency on "test:prepare".

namespace :test do

  desc "Test lib source"
  Rake::TestTask.new(:lib => "test:prepare") do |t|    
    t.libs << "test"
    t.pattern = 'test/lib/**/*_test.rb'
    t.verbose = true    
  end

end

Rake::Task[:test].enhance { Rake::Task["test:lib"].invoke }

Thanks for this! I think you mean "add the following to your Rakefile", not Gemfile though. — notruthless, Jan 30 '14 at 23:15
on rails 4 this adds 3 seconds to boot, just for an empty test/lib dir — Krut, Apr 21 '14 at 17:45
Is this supposed to be Rake::TestTask or Rails::TestTask? First one seems to produce many errors before actually running the tests. — Tashows, Dec 18 '16 at 14:04

Rails and MiniTest: add additional folder

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