```ruby
require 'test_helper'

describe PrxAuth::Rails::Configuration do

  after(:each) { PrxAuth::Rails.configuration =  PrxAuth::Rails::Configuration.new }
  subject { PrxAuth::Rails::Configuration.new }

  it 'initializes with a namespace defined by rails app name' do
    assert subject.namespace == :'dummy/application'
  end

  it 'can be reconfigured using the namespace attr' do
    PrxAuth::Rails.configure do |config|
      config.namespace = :new_test
    end

    assert PrxAuth::Rails.configuration.namespace == :new_test
  end

  it 'defaults to enabling the middleware' do
    assert PrxAuth::Rails.configuration.install_middleware
  end

  it 'allows overriding of the middleware automatic installation' do
    PrxAuth::Rails.configure do |config|
      config.install_middleware = false
    end
    assert !PrxAuth::Rails.configuration.install_middleware
  end
end
```

Move from manipulating globals to locals
user
```ruby
require 'test_helper'

describe PrxAuth::Rails::Configuration do

  subject { PrxAuth::Rails::Configuration.new }

  it 'initializes with a namespace defined by rails app name' do
    assert subject.namespace == :'dummy/application'
  end

  it 'can be reconfigured using the namespace attr' do
    subject.namespace = :new_test

    assert subject.namespace == :new_test
  end

  it 'defaults to enabling the middleware' do
    assert subject.install_middleware
  end

  it 'allows overriding of the middleware automatic installation' do
    subject.install_middleware = false
    assert subject.install_middleware == false
  end
end
```
assistant