Rspec 测试轨生成 CSV

Question

我有一个简单的 CSV rails 生成器，我不知道如何使用 rspec 对其进行测试。我试图关注这篇文章 https://making.dia.com/testing-csv-files-in-rails-on-the-fly-7a1285cc2aac 和那篇文章 Testing CSV.generate with RSpec 但我只是不明白那里发生了什么，这些例子似乎有所不同。

module AdminLogData
  class CsvAdminLogGenerator
    LOG_HEADERS = ['Date&Time', 'Action', 'New Data'].freeze

    def initialize(start_date:, end_date:)
      @start_date = start_date
      @end_date = end_date
    end

    def call
      AdminPanelLog.dates_between(start_date, end_date).find_each do |admin_log|
        CSV.generate(headers: LOG_HEADERS, col_sep: ';', encoding: 'UTF-8') do |csv|
          csv << admin_log.created_at
          csv << admin_log.action_type
          csv << admin_log.admin_email
          csv << admin_log.new_data
        end
      end
    end
  end
end

谁能解释我如何测试这个类？我应该先创建一些假的 csv 吗？

spec

RSpec.describe AdminLogData::CsvAdminLogGenerator do
  subject(:csv_file) { described_class.new(start_date, end_date).call }

  let(:start_date) { 3.months.ago }
  let(:end_date) { 2.months.ago }

  let(:header) { 'column1, column2, column3' }
  let(:row2) { 'value1, value2, value3' }
  let(:row3) { 'value1, value2, value3' }
  let(:rows) { [header, row2, row3] }

  it 'creates CSV file with proper value' do
    expect(csv).to receive(:<<).with(log.created_at)
  end
end

编辑：

   expected collection contained:  ["2019-06-17 22:13:48 +0200,New,monte@kuphal.biz,\"{\"\"email\"\"=>\"\"jeanna@schinner.io\"\", \"\"ro...=>\"\"2019-09-16T22:13:48.752+02:00\"\", \"\"other_activities\"\"=>\"\"forbidden websites\"\"}\"\n"]
   actual collection contained:    ["2019-06-17 22:13:48 +0200", "New", "monte@kuphal.biz", "{\"email\"=>\"brandon@williamsonsporer.org\... \"last_update\"=>\"2019-09-16T22:13:48.752+02:00\", \"other_activities\"=>\"forbidden websites\"}"]
   the missing elements were:      ["2019-06-17 22:13:48 +0200,New,monte@kuphal.biz,\"{\"\"email\"\"=>\"\"jeanna@schinner.io\"\", \"\"ro...=>\"\"2019-09-16T22:13:48.752+02:00\"\", \"\"other_activities\"\"=>\"\"forbidden websites\"\"}\"\n"]
   the extra elements were:        ["2019-06-17 22:13:48 +0200", "New", "monte@kuphal.biz", "{\"email\"=>\"brandon@williamsonsporer.org\... \"last_update\"=>\"2019-09-16T22:13:48.752+02:00\", \"other_activities\"=>\"forbidden websites\"}"]

Answer 1

第 1 步：为 AdminLogData 创建工厂

将 gem factory_bot 与 faker 结合使用，您将能够为您的测试生成假的 AdminLogData 对象。

第 2 步：编写测试

在您的测试中，您更可能想要测试 CSV 行是否包含正确的数据，而不是类接收“

RSpec.describe AdminLogData::CsvAdminLogGenerator do
  subject(:csv_file) { described_class.new(start_date, end_date).call }

  let(:start_date) { 3.months.ago }
  let(:end_date) { 2.months.ago }

  let(:admin_log_data) { FactoryBot.create(:admin_log_data, created_at: 3.months.ago) }

  before { admin_log_data }

  it 'creates CSV file with proper value' do
    expect(csv_file.to_a[1]).to match_array(CSV.generate_line([
      admin_log_data.created_at
      admin_log_data.action_type
      admin_log_data.admin_email
      admin_log_data.new_data      
    ]))
  end
end