How do you perform javascript tests with Minitest, Capybara, Selenium?

Question

There are a lot of examples on how to perform javascript tests with Capybara/Selenium/Rspec in which you can write a test like so:

it "does something", :js => true do
  ...
end

However with minitest you can't pass a second parameter to instruct selenium to perform the test.

Does anyone have any ideas on how this can be done?

Answer 1

What :js flag is doing is very simple. It switches the current driver from default (rack-test) to another one that supports javascript execution (selenium, webkit). You can do the same thing in minitest:

require "minitest/autorun"

class WebsiteTest < MiniTest::Unit::TestCase
  def teardown
    super
    Capybara.use_default_driver
  end

  def test_with_javascript
    Capybara.current_driver = :selenium
    visit "/"
    click_link "Hide"
    assert has_no_link?("Hide")
  end

  def test_without_javascript
    visit "/"
    click_link "Hide"
    assert has_link?("Hide")
  end
end

Of course you can abstract this into a module for convenience:

require "minitest/autorun"

module PossibleJSDriver
  def require_js
    Capybara.current_driver = :selenium
  end

  def teardown
    super
    Capybara.use_default_driver
  end
end

class MiniTest::Unit::TestCase
  include PossibleJSDriver
end

class WebsiteTest < MiniTest::Unit::TestCase
  def test_with_javascript
    require_js
    visit "/"
    click_link "Hide"
    assert has_no_link?("Hide")
  end

  def test_without_javascript
    visit "/"
    click_link "Hide"
    assert has_link?("Hide")
  end
end