I recently had to write a small capybara helper:
def without_page_refresh
page.execute_script("window._withoutPageRefresh = 'BAM'")
yield
page.evaluate_script("window._withoutPageRefresh").should == "BAM", "Page was navigated away"
end
Use case:
You are building a form that gracefully degrades
when javascript is not enabled. It goes something like this:
# uses rack-test so no javascript
scenario "User can lose money in an accessible way" do
visit "/your_account"
page.should have_content "You have $100"
click_button "Charge me"
page.should have_content "You have $50"
end
Next step is to make that form do the ajax thingy.
You copy test above and switch it to use javascript driver:
# uses selenium for javascript
scenario "User can lose money with style", :js => true do
visit "/your_account"
page.should have_content "You have $100"
click_button "Charge me"
page.should have_content "You have $50"
end
Newly written test is pretty good except that it passes without
writing a single line of javascript. So here’s when that helper
comes into play. Our javascript test becomes:
# uses selenium for javascript
scenario "User can lose money with style", :js => true do
visit "/your_account"
without_page_refresh do
page.should have_content "You have $100"
click_button "Charge me"
page.should have_content "You have $50"
end
end
Now javascript test fails with “Page was navigated away”
since nothing is preventing that form from submiting to another page.
About the Author
Follow on Twitter More Content by Dmitriy Kalinin
