warn when attempting to select a disabled option

lib/capybara/node/element.rb

@@ -114,6 +114,7 @@ module Capybara
       # Select this node if is an option element inside a select tag
       #
       def select_option
+        warn "Attempt to select disabled option: #{value || text}" if disabled?
         synchronize { base.select_option }
       end
 
@@ -148,7 +149,7 @@ module Capybara
       def double_click
         synchronize { base.double_click }
       end
-      
+
       ##
       #
       # Send Keystrokes to the Element
@@ -215,7 +216,7 @@ module Capybara
       # :f10
       # :f11
       # :f12
-      # :meta         
+      # :meta
       # :command      - alias of :meta
       #
       def send_keys(*args)

lib/capybara/rack_test/node.rb

@@ -36,6 +36,7 @@ class Capybara::RackTest::Node < Capybara::Driver::Node
   end
 
   def select_option
+    return if disabled?
     if select_node['multiple'] != 'multiple'
       select_node.find_xpath(".//option[@selected]").each { |node| node.native.remove_attribute("selected") }
     end

lib/capybara/spec/session/select_spec.rb

@@ -108,6 +108,18 @@ Capybara::SpecHelper.spec "#select" do
     end
   end
 
+  context "on a disabled option" do
+    it "should not select" do
+      @session.select('Other', :from => 'form_title')
+      expect(@session.find_field('form_title').value).not_to eq 'Other'
+    end
+
+    it "should warn" do
+      expect_any_instance_of(Capybara::Node::Element).to receive(:warn).once
+      @session.select('Other', :from => 'form_title')
+    end
+  end
+
   context "with multiple select" do
     it "should return an empty value" do
       expect(@session.find_field('Language').value).to eq([])