如何将固定装置隔离到特定的 Rails 测试

How to isolate fixtures to specific Rails tests

如何将固定装置的使用隔离到特定测试?

在我的设置中,我的一些测试依赖于夹具数据,而另一些则不依赖,因此使用 fixtures :all 在 test_helper.rb 中加载我的所有夹具的默认设置会破坏我的测试。

需要空行为主义者的示例集成测试table:

require 'test_helper'

class WelcomeFlowTest < ActionDispatch::IntegrationTest
  test "when no user is found start welcome flow" do
    get "/"
    follow_redirect!
    assert_response :success

    post "/setup", {
      behaviorist: { name: "Andy", email: "andy.bettisworth@accreu.com" },
      habit: { name: "Interval running", on_monday: false, on_tuesday: true, \
               on_wednesday: false, on_thursday: true, on_friday: false, \
               on_saturday: true, on_sunday: false }
    }
    assert_response :success
    assert_equal 1, Behaviorist.count
    assert_equal 1, Habit.count
  end
end

我的单元测试需要行为主义装置:

require 'test_helper'

class BehavioristTest < ActiveSupport::TestCase
  test "validates uniqueness of :name" do
    andy = Behaviorist.new(name: "Andy", remote_ip: "127.0.0.1")
    assert_not run.valid?
    assert_match /has already been taken/, andy.errors[:name].join
  end
end

通过深入了解 Rails 如何实现固定装置,我发现固定装置一旦加载,就会通过事务与每个 TestCase 中的更改隔离开来。我的工作解决方案是删除在 test_helper.rb 中加载 fixtures :all。然后对于每个需要固定装置的测试,我覆盖使用事务固定装置的默认值,加载特定固定装置,然后在拆卸时删除它们。

单个测试用例的隔离夹具示例:

require 'test_helper'

class BehavioristTest < ActiveSupport::TestCase
  self.use_transactional_fixtures = false
  fixtures :behaviorists
  teardown :delete_behaviorists

  test "validates uniqueness of :name" do
    andy = Behaviorist.new(name: "Andy", remote_ip: "127.0.0.1")
    assert_not run.valid?
    assert_match /has already been taken/, run.errors[:name].join
  end

  private

  def delete_behaviorists
    Behaviorist.delete_all
  end
end