There comes a time when we might need to write some unit tests for a module. To do this, we can just extend some class and test the methods on that class. Here is an example using Rspec’s subject class; extending it with SomeProject::MyHelpers to unit test a method called :helpfulness.
require 'spec_helper'
describe SomeProject::MyHelpers do
# add the module methods as instance methods to Rspec's subject
subject do
self.extend(described_class)
end
describe 'The helpfulness of my helper' do
it 'helps a lot' do
expect(subject.helpfulness).to eq "a lot"
end
end
end