Dry-Example

test.rb

# frozen_string_literal: true

require "minitest/mock"

class MyJobTest < ActiveJob::TestCase
  # Helper function to wrap mocking the :mymethod method
  #
  # expectations - Array of Procs/Lambdas that will be checked against the message
  #                argument that is passed to the :mymethod method in the MyModule::myclass
  #                object, all must return true.
  #
  def mymethod_mock(expectations: [])
    mock = Minitest::Mock.new
    mock.expect :call, nil do |id:, message:|
      ticket_id.is_a?(Integer) &&
      message.is_a?(String) &&
      expectations.all? do |func|
        func.call(message)
      end
    end
    MyModule::myclass.any_instance.stub(:mymethod, mock) do
      yield
    end
    mock.verify
  end

  test "check job calls method" do
    assert(mymethod_mock {
      MyJob.perform_now(id: 1234) 
    })
  end
  
  test "check job creates message" do
    assert(mymethod_mock(expectations:[
     ->(message) { message.downcase.include?("hello, world!") }
     ]) {
       MyJob.perform_now(id: 1234)
    })
  end
end