[Test a Ruby module] #rspec

NOTES

Related: https://www.rubydoc.info/gems/rubocop-rspec/1.6.0/RuboCop/Cop/RSpec/AnyInstance

some_module.rb

module Some
  module Module
    def module_method
      "I'm a module method!"
    end
    
    class << self
      def class_method
        "I'm a class method!"
      end
    end
  end
end

some_module_spec.rb

include 'spec_helper'
include 'some_module'

describe Some::Module do
  include described_class # Allow module methods to be tested
  
  let(:klass) do
    Class.new do
      include described_class # Allow class methods to be tested
    end 
  end 

  describe '.module_method' do
    it 'prints something' do
      expect(module_method).to eql("I'm a module method!")
    end
  end

  describe '.class_method' do
    it 'prints something' do
      expect(klass.new.class_method).to eql("I'm a class method!")
    end
    
    # This *might* also work
    it 'prints something' do
      expect(described_class.class_method).to eql("I'm a class method!")
    end
  end
end