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rspec - How do I change the default "www.example.com" domain for testing in rails?

I have a rails application which acts differently depending on what domain it's accessed at (for example www.myapp.com will invoke differently to user.myapp.com). In production use this all works fine but my test code always sees a hostname of "www.example.com".

Is there a clean way of having a test specify the hostname it's pretending to access?

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I think all answers are incomplete here... To enumerate all possible cases:

  • Integration Specs (inheriting from ActionDispatch::IntegrationTest):

    host! "my.awesome.host"
    

    See the docs, section 5.1 Helpers Available for Integration Tests.

  • Controller Specs (inheriting from ActionController::TestCase)

    @request.host = 'my.awesome.host'
    

    See the docs, section 4.4 Instance Variables Available.

  • Feature Specs (through Capybara)

    Capybara.default_host = "http://my.awesome.host"
    # Or to configure domain for route helpers:
    default_url_options[:host] = "my.awesome.host"
    

    From @AminAriana's answer

  • View Specs (inheriting from ActionView::TestCase)

    @request.host = 'my.awesome.host'
    

    ...or through RSpec:

    controller.request.host = "my.awesome.host"
    

    See the rspec-rails view spec docs.


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