describe 'Ridgepole::Client#diff -> migrate' do
  context 'when database and definition are same (default null / nothing -> null:true)' do
    let(:actual_dsl) {
      erbh(<<-EOS)
        create_table "employees", primary_key: "emp_no", force: :cascade 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)
        create_table "employees", primary_key: "emp_no", force: :cascade 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_ruby actual_dsl
      delta.migrate
      expect(subject.dump).to match_ruby 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)
        create_table "employees", primary_key: "emp_no", force: :cascade 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)
        create_table "employees", primary_key: "emp_no", force: :cascade 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_ruby actual_dsl.gsub(/\s*,\s*null: true/, '')
      delta.migrate
      expect(subject.dump).to match_ruby expected_dsl
    }
  end
end