ruby-on-rails - rails : How do I ensure that the db reverts to its original state after tests?

Question

我正在尝试编写一个涉及创建新用户的测试。但是，除了第一次之外，测试都失败了，因为用户在初始运行后永久保留在数据库中。

require 'test_helper'
require 'minitest/autorun'

describe UserMailer < ActionMailer::TestCase do
  it 'will send an email when a new user is created' do
    original_mail_count = ActionMailer::Base.deliveries.count
    User.create(email: "new_user@test.com", password: "password").save
    ActionMailer::Base.deliveries.count.must_equal original_mail_count + 1
  end
end

如何确保数据库在测试运行后恢复到测试前的状态？

Answer 1

使用database_cleaner gem

示例用法:

# spec_helper.rb
RSpec.configure do |config|
    config.before(:each) do
        DatabaseCleaner.strategy = :transaction
        DatabaseCleaner.start
    end
    config.after(:each) do
        DatabaseCleaner.clean
    end
end