I have a situation where I am developing a Railtie Engine and have two 
dummy apps for testing, and therefore two distinct 'rails_helper.rb' 
helpers to load one or the other app per specific spec file.

# rails_helper_1.rb
...
require File.expand_path("dummy_1/config/environment", File.dirname(__FILE__
))
...


# rails_helper_2.rb
...
require File.expand_path("dummy_2/config/environment", File.dirname(__FILE__
))
...



Then specs like:


# spec/controllers/dummy_1/some_controller_spec.rb
require 'rails_helper_1.rb'
...


# spec/controllers/dummy_2/some_controller_spec.rb
require 'rails_helper_2.rb'
...



The problem is that, once the environment from dummy_1 is loaded and RSpec 
tries to load the environment from dummy_1, it throws the error: 
*'initialize!': 
Application has been already initialized. (RuntimeError)*

I cannot find the way to "unload" or "uninitialize" a currently loaded app 
env from RSpec, any ideas?

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