describe 'Ridgepole::Client#diff -> migrate' do
  let(:template_variables) {
    opts = {
      unsigned: {}
    }

    if condition(:mysql_awesome_enabled)
      opts[:unsigned] = {unsigned: true}
    end

    opts
  }

  context 'when database and definition are same (default null / nothing -> null:true)' do
    let(:actual_dsl) {
      erbh(<<-EOS, template_variables)
        create_table "employees", primary_key: "emp_no", <%= {force: :cascade}.unshift(@unsigned).i %> do |t|
          t.date   "birth_date",            null: false
          t.string "first_name", limit: 14, null: false
          t.string "last_name",  limit: 16, null: false
          t.string "gender",     limit: 1,  null: false
          t.date   "hire_date"
        end
      EOS
    }

    let(:expected_dsl) {
      erbh(<<-EOS, template_variables)
        create_table "employees", primary_key: "emp_no", <%= {force: :cascade}.unshift(@unsigned).i %> do |t|
          t.date   "birth_date",            null: false
          t.string "first_name", limit: 14, null: false
          t.string "last_name",  limit: 16, null: false
          t.string "gender",     limit: 1,  null: false
          t.date   "hire_date",             null: true
        end
      EOS
    }

    before { subject.diff(actual_dsl).migrate }
    subject { client }

    it {
      delta = subject.diff(expected_dsl)
      expect(delta.differ?).to be_falsey
      expect(subject.dump).to match_fuzzy actual_dsl
      delta.migrate
      expect(subject.dump).to match_fuzzy expected_dsl.gsub(/\s*,\s*null: true/, '')
    }
  end

  context 'when database and definition are same (default null / null:true -> nothing)' do
    let(:actual_dsl) {
      erbh(<<-EOS, template_variables)
        create_table "employees", primary_key: "emp_no", <%= {force: :cascade}.unshift(@unsigned).i %> do |t|
          t.date   "birth_date",            null: false
          t.string "first_name", limit: 14, null: false
          t.string "last_name",  limit: 16, null: false
          t.string "gender",     limit: 1,  null: false
          t.date   "hire_date",             null: true
        end
      EOS
    }

    let(:expected_dsl) {
      erbh(<<-EOS, template_variables)
        create_table "employees", primary_key: "emp_no", <%= {force: :cascade}.unshift(@unsigned).i %> do |t|
          t.date   "birth_date",            null: false
          t.string "first_name", limit: 14, null: false
          t.string "last_name",  limit: 16, null: false
          t.string "gender",     limit: 1,  null: false
          t.date   "hire_date"
        end
      EOS
    }

    before { subject.diff(actual_dsl).migrate }
    subject { client }

    it {
      delta = subject.diff(expected_dsl)
      expect(delta.differ?).to be_falsey
      expect(subject.dump).to match_fuzzy actual_dsl.gsub(/\s*,\s*null: true/, '')
      delta.migrate
      expect(subject.dump).to match_fuzzy expected_dsl
    }
  end
end