I just learn how to use cucumber. Can you tell me how to complete this code?
You can implement step definitions for undefined steps with these snippets:
You can use canned steps (pre-defined) to take screenshot.
Then take picture
There is not need for any step definition. Cucumber also comes with many other pre-defined steps. See other canned steps
If you still need to write step definition.
Then /^I take a screenshot$/ do
page.save_screenshot('image_name.png')
end