Accept dialog by default if user didn't provide callback

Author: route

bin/console

@@ -1,5 +1,8 @@
 #!/usr/bin/env ruby
 
+lib = File.expand_path("../lib", __dir__)
+$:.unshift(lib) unless $:.include?(lib)
+
 require "irb"
 require "irb/completion"
 require "ferrum"

lib/ferrum/page.rb

@@ -218,6 +218,14 @@ def subscribe
           Thread.main.raise JavaScriptError.new(params.dig("exceptionDetails", "exception"))
         end
       end
+
+      on(:dialog) do |dialog, index, total|
+        if total == 1
+          warn "Dialog was shown but you didn't provide `on(:dialog)` callback, accepting it by default. " \
+               "Please take a look at https://github.com/rubycdp/ferrum#dialog"
+          dialog.accept
+        end
+      end
     end
 
     def prepare_page