How to use HTTP status code symbols in RSpec?

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The response object responds to several of the symbol types as messages. So you can simply do:

expect(response).to be_success
expect(response).to be_error
expect(response).to be_missing
expect(response).to be_redirect

For the other types, such as :created, you can create a simple custom matcher for this which wraps assert_response:

RSpec::Matchers.define :have_status do |type, message = nil|
  match do |_response|
    assert_response type, message
  end
end

expect(response).to have_status(:created)
expect(response).to have_status(404)

This should work fine for controller specs which have the proper state setup. It will not work for feature specs. I haven’t tried with request specs, so your milage may vary there.

The reason this works is it leverages the fact that RSpec controller specs have similar state setup behind the scenes. So when assert_response accesses @response it is available.

This matcher can probably be improved by simply copying the code used by assert_response into the matcher:

RSpec::Matchers.define :have_status do |type, message = nil|
  match do |response|
    if Symbol === type
      if [:success, :missing, :redirect, :error].include?(type)
        response.send("#{type}?")
      else
        code = Rack::Utils::SYMBOL_TO_STATUS_CODE[type]
        response.response_code == code
      end
    else
      response.response_code == type
    end
  end

  failure_message do |response|
    message or
      "Expected response to be a <#{type}>, but was <#{response.response_code}>"
  end
end

UPDATE: 2014-07-02

This is now available out of the box with RSpec Rails 3: https://www.relishapp.com/rspec/rspec-rails/v/3-0/docs/matchers/have-http-status-matcher

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