我最近从 v4.3 升级到 Rails 5.1，现在在运行测试时遇到这个错误:

An error occurred while loading 

./spec/controllers/admin/capacity_charges_controller_spec.rb.
Failure/Error: require File.expand_path('../../config/environment', __FILE__)

RuntimeError:
  can't modify frozen Array

我为每个测试文件都得到了它。触发错误的行来自 rails_helper。我已经检查了 Rails 5.1 示例 repo 协议(protocol)，我们的版本没有什么本质上的不同。

完整的堆栈跟踪是:

RuntimeError:


can't modify frozen Array
# /Users/jeremynagel/.rvm/gems/ruby-2.3.1@Rails4.2_EnergyLink/gems/actionpack-5.1.0/lib/action_dispatch/middleware/stack.rb:74:in `insert'
# /Users/jeremynagel/.rvm/gems/ruby-2.3.1@Rails4.2_EnergyLink/gems/actionpack-5.1.0/lib/action_dispatch/middleware/stack.rb:74:in `insert'
# /Users/jeremynagel/.rvm/gems/ruby-2.3.1@Rails4.2_EnergyLink/gems/actionpack-5.1.0/lib/action_dispatch/middleware/stack.rb:81:in `insert_after'
# /Users/jeremynagel/.rvm/gems/ruby-2.3.1@Rails4.2_EnergyLink/gems/request_store-1.3.2/lib/request_store/railtie.rb:5:in `block in <class:Railtie>'
# /Users/jeremynagel/.rvm/gems/ruby-2.3.1@Rails4.2_EnergyLink/gems/railties-5.1.0/lib/rails/initializable.rb:30:in `instance_exec'
# /Users/jeremynagel/.rvm/gems/ruby-2.3.1@Rails4.2_EnergyLink/gems/railties-5.1.0/lib/rails/initializable.rb:30:in `run'
# /Users/jeremynagel/.rvm/gems/ruby-2.3.1@Rails4.2_EnergyLink/gems/railties-5.1.0/lib/rails/initializable.rb:59:in `block in run_initializers'
# /Users/jeremynagel/.rvm/gems/ruby-2.3.1@Rails4.2_EnergyLink/gems/railties-5.1.0/lib/rails/initializable.rb:58:in `run_initializers'
# /Users/jeremynagel/.rvm/gems/ruby-2.3.1@Rails4.2_EnergyLink/gems/railties-5.1.0/lib/rails/application.rb:353:in `initialize!'
# ./config/environment.rb:5:in `<top (required)>'
# /Users/jeremynagel/.rvm/gems/ruby-2.3.1@Rails4.2_EnergyLink/gems/activesupport-5.1.0/lib/active_support/dependencies.rb:292:in `require'
# /Users/jeremynagel/.rvm/gems/ruby-2.3.1@Rails4.2_EnergyLink/gems/activesupport-5.1.0/lib/active_support/dependencies.rb:292:in `block in require'
# /Users/jeremynagel/.rvm/gems/ruby-2.3.1@Rails4.2_EnergyLink/gems/activesupport-5.1.0/lib/active_support/dependencies.rb:258:in `load_dependency'
# /Users/jeremynagel/.rvm/gems/ruby-2.3.1@Rails4.2_EnergyLink/gems/activesupport-5.1.0/lib/active_support/dependencies.rb:292:in `require'
# ./spec/rails_helper.rb:12:in `<top (required)>'
# /Users/jeremynagel/.rvm/gems/ruby-2.3.1@Rails4.2_EnergyLink/gems/activesupport-5.1.0/lib/active_support/dependencies.rb:292:in `require'
# /Users/jeremynagel/.rvm/gems/ruby-2.3.1@Rails4.2_EnergyLink/gems/activesupport-5.1.0/lib/active_support/dependencies.rb:292:in `block in require'
# /Users/jeremynagel/.rvm/gems/ruby-2.3.1@Rails4.2_EnergyLink/gems/activesupport-5.1.0/lib/active_support/dependencies.rb:258:in `load_dependency'
# /Users/jeremynagel/.rvm/gems/ruby-2.3.1@Rails4.2_EnergyLink/gems/activesupport-5.1.0/lib/active_support/dependencies.rb:292:in `require'
# ./spec/controllers/admin/capacity_charges_controller_spec.rb:3:in `<top (required)>'
# /Users/jeremynagel/.rvm/gems/ruby-2.3.1@Rails4.2_EnergyLink/gems/activesupport-5.1.0/lib/active_support/dependencies.rb:286:in `load'
# /Users/jeremynagel/.rvm/gems/ruby-2.3.1@Rails4.2_EnergyLink/gems/activesupport-5.1.0/lib/active_support/dependencies.rb:286:in `block in load'
# /Users/jeremynagel/.rvm/gems/ruby-2.3.1@Rails4.2_EnergyLink/gems/activesupport-5.1.0/lib/active_support/dependencies.rb:258:in `load_dependency'
# /Users/jeremynagel/.rvm/gems/ruby-2.3.1@Rails4.2_EnergyLink/gems/activesupport-5.1.0/lib/active_support/dependencies.rb:286:in `load'

最佳答案

事实证明，这是由堆栈跟踪中更高层的测试失败引起的。很难看出根本原因是什么，因为控制台中有太多内容。如果您遇到此问题，我建议您使用 --fail-fast，这样您就不会被反复出现的错误消息弄得不知所措。然后检查第一个错误是什么。

关于ruby-on-rails - rails : RuntimeError - can't modify frozen Array when running rspec in rails，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/47320772/