Loading rails 2.3 / 3+ in your gem tests

In case you want to test your gem / plugin on multiple rails version:

require 'rails/version'

if Rails::VERSION::MAJOR > 2
  require 'rails'
else
  module Rails
    class FakeConfig
      def after_initialize
      end
    end
    @@configuration = FakeConfig.new
  end
  require 'initializer'
end

ActiveRecord slow_delete_all

Deletes taking to long, just take a break 🙂
(so replication can catch up/things get unblocked)

Only use save sql, there is no escapeing.

  class ActiveRecord::Base
    def self.slow_delete_all(condition)
      count = 0
      loop do
        result = ActiveRecord::Base.connection.send(:delete_sql, "delete from #{table_name} where #{condition} limit 10000")
        count += result
        break if result == 0
        sleep 1
      end
      count
    end
  end

Ruby: Kill all threads

In case you spam a lot of threads and dont know how to get rid of them…

Thread.list.each do |thread|
  thread.exit unless thread == Thread.current
end

assert_change and assert_no_change for Test::Unit + Minitest inspired by RSpec

Usage

@updated_at = lambda{ @model.updated_at.to_i }
assert_change(@updated_at) { @model.touch }
assert_no_change(@updated_at) { @model.reload }

Code

  def assert_change(what)
    old = what.call
    yield
    assert_not_equal old, what.call
  end

  def assert_no_change(what)
    old = what.call
    yield
    assert_equal old, what.call
  end

Testing geolocation with capybara + selenium + firefox

Just built this little snippet in a hacknight, it simulates a geolcation via capybara, so you can test if you geo-magic actually works 🙂

View

<p>Finding your location... <span id="status">checking...</span></p>
<script>
  jQuery(function () {
    var timeout = (document.location.href.indexOf('test_location') >= 0 ? 100 : 0);

    setTimeout(function(){
      navigator.geolocation.getCurrentPosition(function(){
        jQuery('#status').html("found you!");
      });
    }, timeout)
  });
</script>

Capybara test via selenium in rspec

  def simulate_location(lat, lng)
    page.driver.browser.execute_script <<-JS
      window.navigator.geolocation.getCurrentPosition = function(success){
        var position = {"coords" : { "latitude": "#{lat}", "longitude": "#{lng}" }};
        success(position);
      }
    JS
  end

  it "can use location", :js => true do
    visit '/?test_location=true'
    simulate_location 20, 20
    sleep 0.2
    page.should have_content "found you!"
  end

Michael Grosser, the Blog

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Category Archives: Ruby