gistfile1.rb

  describe '.created' do
    let! (:activity) { create :activity, task: 'created' }

    it { expect(Activity.created).to eq([activity]) }
  end

  describe '.deleted' do
    let! (:activity) { create :activity, task: 'deleted' }

    it { expect(Activity.deleted).to eq([activity]) }
  end

  describe '.updated' do
    let! (:activity) { create :activity, task: 'updated' }

    it { expect(Activity.updated).to eq([activity]) }
  end

gistfile2.rb

  def self.created
    where(task: 'created')
  end

  def self.updated
    where(task: 'updated')
  end

  def self.deleted
    where(task: 'deleted')
  end