Setting the size of Browser Window + Selenium and Capybara

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window = Capybara.current_session.driver.browser.manage.window
 window.resize_to(1200, 800)

You can add this inside setup block. 
class CapybaraIntegrationTest < ActionDispatch::IntegrationTest
  # Make the Capybara DSL available in all integration tests
  include Capybara::DSL

  setup do
    window = Capybara.current_session.driver.browser.manage.window
    window.resize_to(1250, 800)
  end
end

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