How to confirm a javascript popup with capybara?

@herminia_bruen 

To confirm a JavaScript popup with Capybara, you can use the accept_alert method provided by Capybara. Here is an example of how you can use it in your test:

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# Click on a button that triggers a JavaScript popup
click_button 'Confirm'

# Use accept_alert to confirm the popup
accept_alert

# Continue with your test
expect(page).to have_content 'Popup confirmed!'

This code snippet assumes that clicking a button triggers a JavaScript popup, and the accept_alert method is used to confirm the popup. You can then continue with your test assertions after confirming the popup.