Rspec testing validator

data_validator_spec.rb

require 'rails_helper'

class Validatable
  include ActiveModel::Validations
  attr_accessor :data
  validates :data, lead_data: true
end

describe DataValidator do
  subject { Validatable.new }
  before { subject.data = data }

  context 'valid data' do
    let(:data) do
      { 'product' => 'Valid Product' }
    end

    it { is_expected.to be_valid }
  end

  context 'contains invalid data' do
    let(:data) do
      { 'product' => 'Invalid Product' }
    end

    it { is_expected.to be_invalid }
  end

  context 'empty data' do
    let(:data) { {} }

    it { is_expected.to be_invalid }
  end
end