require 'pathname'
require Pathname(__FILE__).dirname.expand_path.parent + 'spec_helper'

if HAS_SQLITE3 || HAS_MYSQL || HAS_POSTGRES
  describe 'empty migration runner' do
    it "should return an empty array if no migrations have been defined" do
      migrations.should be_kind_of(Array)
      migrations.should have(0).item
    end
  end
  describe 'migration runnner' do
    # set up some 'global' setup and teardown tasks
    before(:each) do
      migration( 1, :create_people_table) { }
    end

    after(:each) do
      @@migrations = []
    end

    describe '#migration' do

      it 'should create a new migration object, and add it to the list of migrations' do
        @@migrations.should be_kind_of(Array)
        @@migrations.should have(1).item
        @@migrations.first.name.should == "create_people_table"
      end

      it 'should allow multiple migrations to be added' do
        migration( 2, :add_dob_to_people) { }
        migration( 2, :add_favorite_pet_to_people) { }
        migration( 3, :add_something_else_to_people) { }
        @@migrations.should have(4).items
      end

      it 'should raise an error on adding with a duplicated name' do
        lambda { migration( 1, :create_people_table) { } }.should raise_error(RuntimeError, /Migration name conflict/)
      end

    end

    describe '#migrate_up! and #migrate_down!' do
      before(:each) do
        migration( 2, :add_dob_to_people) { }
        migration( 2, :add_favorite_pet_to_people) { }
        migration( 3, :add_something_else_to_people) { }
      end

      it 'calling migrate_up! should migrate up all the migrations' do
        # add our expection that migrate_up should be called
        @@migrations.each do |m|
          m.should_receive(:perform_up)
        end
        migrate_up!
      end

      it 'calling migrate_up! with an arguement should only migrate to that level' do
        @@migrations.each do |m|
          if m.position <= 2
            m.should_receive(:perform_up)
          else
            m.should_not_receive(:perform_up)
          end
        end
        migrate_up!(2)
      end

      it 'calling migrate_down! should migrate down all the migrations' do
        # add our expection that migrate_up should be called
        @@migrations.each do |m|
          m.should_receive(:perform_down)
        end
        migrate_down!
      end

    end
  end
end