first_rake_test.rb

require 'minitest'
require "minitest/autorun"
require "minitest/focus"
require 'rake'
require 'sequel'
require 'mocha/mini_test'
require 'padrino-core'
require 'pry'


class SequelWrapper
  def initialize(sequel, sequel_migrator, sequel_model)
    @sequel = sequel
    @sequel_migrator = sequel_migrator
    @sequel_model = sequel_model
  end

  def up
    @sequel.extension :migration
    @sequel_migrator.run @sequel_model.db, 'db/migrate'
    puts '<= sq:migrate:up executed'
  end
end

describe "SequelWrapper" do
  it "call the up method" do
    Sequel.extension :migration, :core_extensions

    sequel_mock = MiniTest::Mock.new
    sequel_mock.expect(:extension, nil, [:migration])

    sequel_model_mock = MiniTest::Mock.new
    expected_db_mock = mock('Sequel::Model.db')
    sequel_model_mock.expect(:db, expected_db_mock)

    sequel_migrator_mock = MiniTest::Mock.new
    sequel_migrator_mock.expect(:run, nil, [expected_db_mock, 'db/migrate'])

    sequel_wrapper = SequelWrapper.new(sequel_mock, sequel_migrator_mock, sequel_model_mock)

    assert_output(/<= sq:migrate:up executed/) { sequel_wrapper.up }
    assert sequel_mock.verify
    assert sequel_migrator_mock.verify
    assert sequel_model_mock.verify
  end

end

namespace :sq do
  namespace :migrate do
    task :up => :skeleton do
      SequelWrapper.new(Sequel, Sequel::Migrator, Sequel::Model.db)
    end
  end
end


# and testing the rake task

describe "sql" do
  describe "migrate" do
    it "#up" do
      db = Sequel::Database.new()
      Rake::Task["sq:migrate:up"].invoke
      db.disconnect
    end
  end
end

# Now I go the following sometimes the following error

sq::migrate#test_0001_#up:
NameError: uninitialized constant Sequel::Migrator
Did you mean?  Sequel::Migrator
               Sequel::Migration
    test_sequel.rb:45:in `block (3 levels) in <main>'
    /home/wm/.rvm/gems/ruby-2.4.1/gems/rake-12.0.0/lib/rake/task.rb:250:in `block in execute'
    /home/wm/.rvm/gems/ruby-2.4.1/gems/rake-12.0.0/lib/rake/task.rb:250:in `each'
    /home/wm/.rvm/gems/ruby-2.4.1/gems/rake-12.0.0/lib/rake/task.rb:250:in `execute'
    /home/wm/.rvm/gems/ruby-2.4.1/gems/rake-12.0.0/lib/rake/task.rb:194:in `block in invoke_with_call_chain'
    /home/wm/.rvm/rubies/ruby-2.4.1/lib/ruby/2.4.0/monitor.rb:214:in `mon_synchronize'
    /home/wm/.rvm/gems/ruby-2.4.1/gems/rake-12.0.0/lib/rake/task.rb:187:in `invoke_with_call_chain'
    /home/wm/.rvm/gems/ruby-2.4.1/gems/rake-12.0.0/lib/rake/task.rb:180:in `invoke'
    test_sequel.rb:86:in `block (3 levels) in <main>'

2 runs, 5 assertions, 0 failures, 1 errors, 0 skips