如何在每次测试之前让Rails测试数据库重建？

Question

我目前正在开始从灯具迁移到工厂并遇到一些测试数据库挑战.

当我运行整个测试套件时,数据库将被清除,并重新加载新的工厂生成的数据.但是,当我运行单个单元测试时,数据库不会清除旧值.

我可以在每个单独的测试之前运行rake db:test:prepare,但这会减慢我的开发速度.

这是我的测试设置:

  self.use_transactional_fixtures = false
  self.use_instantiated_fixtures  = true

例如:

require File.dirname(__FILE__) + '/../test_helper'
class LocationTest < ActiveSupport::TestCase
  test "should require name to save" do
    location = Factory.create(:location)
  end
end

将成功运行一次但在后续运行测试文件时失败.之前从未发生这种情况,因为测试夹具会在每次运行时加载.

我添加了工厂排序,但在每次运行期间只有序列属性:

  Factory.define :location do |l|
    l.sequence(:name) {|n| "place#{n}"}
    l.street  '123 N Pitt Street'
    l.state_id 4
    l.city 'San Francisco'
    l.location_type_id LocationType::COMMON
    l.shipper_id 1
    l.zip 23658
  end

结果是:

trunk>ruby test\unit\location_test.rb
Loaded suite test/unit/location_test
Started
.
Finished in 0.162 seconds.

1 tests, 0 assertions, 0 failures, 0 errors

>ruby test\unit\location_test.rb
Loaded suite test/unit/location_test
Started
E
Finished in 0.134 seconds.

  1) Error:
test_should_require_name_to_save(LocationTest):
ActiveRecord::RecordInvalid: Validation failed: Name has already been taken
    c:/ruby/lib/ruby/gems/1.8/gems/thoughtbot-factory_girl-1.2.1/lib/factory_girl/proxy/create.rb:5:in `result'
    c:/ruby/lib/ruby/gems/1.8/gems/thoughtbot-factory_girl-1.2.1/lib/factory_girl/factory.rb:293:in `run'
    c:/ruby/lib/ruby/gems/1.8/gems/thoughtbot-factory_girl-1.2.1/lib/factory_girl/factory.rb:237:in `create'
    test/unit/location_test.rb:18:in `test_should_require_name_to_save'

1 tests, 0 assertions, 0 failures, 1 errors

Answer 1

首先检查您的测试设置，以确保它们是您想要的，尽管我怀疑您可能有理由不允许在事务中运行测试的标准做法（退出时回滚）。

其他选项是（1）手动使用事务进行测试，如上面的测试（如果还没有事务），加上（2）添加一种teardown方法来手动清除相关表。