formaction support

lib/capybara/rack_test/form.rb

@@ -71,7 +71,8 @@ class Capybara::RackTest::Form < Capybara::RackTest::Node
   end
 
   def submit(button)
-    driver.submit(method, native['action'].to_s, params(button))
+    action = (button && button['formaction']) || native['action']
+    driver.submit(method, action.to_s, params(button))
   end
 
   def multipart?

lib/capybara/spec/session/click_button_spec.rb

@@ -346,6 +346,15 @@ Capybara::SpecHelper.spec '#click_button' do
     end
   end
 
+  context "with formaction attribute on button" do
+    it "should submit to the formaction attribute" do
+      @session.click_button('Formaction button')
+      @session.current_path.should == '/form'
+      @results = extract_results(@session)
+      @results['which_form'].should == 'formaction form'
+    end
+  end
+
   it "should serialize and send valueless buttons that were clicked" do
     @session.click_button('No Value!')
     @results = extract_results(@session)

lib/capybara/spec/views/form.erb

@@ -429,6 +429,13 @@ New line after and before textarea tag
   </p>
 </form>
 
+<form action="/other_form" method="post">
+  <p>
+    <input type="text" name="form[which_form]" value="formaction form"/>
+  </p>
+  <input type="submit" name="form[button]" formaction="/form" value="Formaction button"/>
+</form>
+
 <form action="relative" method="post">
   <p>
     <input type="submit" name="form[relative]" value="Relative Action" />