How can I run system tests without a browser in Rails 5.1?

Question

The documentation for Rails 5.1 system tests is a bit rare. I can not get tests without sound that run javascript. I think one approach involves installing and running xvf. But this is a more manual setting than I used to when starting capybara on other versions of rails.

What is the easiest way to achieve this?

Answer 1

In Rails 5.1 tests, the driver used is set by calling driven_byApplicationSystemTestCase (test / application_system_test_case.rb). Assuming you have registered your capybara-webkit driver as "webkit", you should be able to do

driven_by :webkit

Another potential option if you are using Chrome 59+ on linux / mac is to use headless chrome

Capybara.register_driver :headless_chrome do |app|
  Capybara::Selenium::Driver.new(app, :browser => :chrome, :args => ['headless'])
end

and then in your test class

driven_by :headless_chrome

This gives you a headless version of chrome, so none of the problems of capybara-webkit / poltergeist supports current web standards. Unfortunately, chromedriver currently has problems with JS system mods (warning, confirmation, hint - a workaround in the master capybara branch) and freezes if you try to close windows during tests. We hope that these 2 questions will be fixed in the near future.

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