allow for blockless modal methods in selenium

lib/capybara/selenium/driver.rb

@@ -205,7 +205,7 @@ class Capybara::Selenium::Driver < Capybara::Driver::Base
   end
 
   def accept_modal(type, options={}, &blk)
-    yield
+    yield if block_given?
     modal = find_modal(options)
     modal.send_keys options[:with] if options[:with]
     message = modal.text
@@ -214,7 +214,7 @@ class Capybara::Selenium::Driver < Capybara::Driver::Base
   end
 
   def dismiss_modal(type, options={}, &blk)
-    yield
+    yield if block_given?
     modal = find_modal(options)
     message = modal.text
     modal.dismiss

spec/selenium_spec.rb

@@ -63,6 +63,16 @@ RSpec.describe Capybara::Session do
         expect($?.exitstatus).to be 0
       end
     end
+    
+    describe "#accept_alert", focus: true do
+      it "supports a blockless mode" do
+        @session.visit('/with_js')
+        @session.click_link('Open alert')
+        expect(@session.driver.browser.switch_to.alert).to be_kind_of Selenium::WebDriver::Alert
+        @session.accept_alert
+        expect{@session.driver.browser.switch_to.alert}.to raise_error("No alert is present")
+      end
+    end
   end
 end
 
@@ -81,4 +91,3 @@ RSpec.describe Capybara::Selenium::Driver do
   end
 end
 
-