Add support for <button> tag in Session#click_button

lib/capybara/session.rb

@@ -142,8 +142,9 @@ module Capybara
     end
 
     def find_button(locator)
-      button = find("//input[@type='submit' or @type='image'][@id='#{locator}' or @value='#{locator}']").first || find("//button[@id='#{locator}' or @value='#{locator}' or contains(.,'#{locator}')]").first
-      raise Capybara::ElementNotFound, "no button with value or id '#{locator}' found" unless button
+      button = find("//input[@type='submit' or @type='image'][@id='#{locator}' or @value='#{locator}']").first \
+               || find("//button[@id='#{locator}' or @value='#{locator}' or contains(.,'#{locator}')]").first
+      raise Capybara::ElementNotFound, "no button with value or id or text '#{locator}' found" unless button
       button
     end
 

spec/session_spec.rb

@@ -145,6 +145,38 @@ shared_examples_for "session" do
       end
     end
 
+    context "when the button is defined by a <button> tag" do
+
+      before do
+        @session.visit('/buttons')
+      end
+
+      context "with text given" do
+        it "should locate the button" do
+          running do
+            @session.click_button('Click me')
+          end.should_not raise_error(Capybara::ElementNotFound)
+        end
+      end
+
+      context "with id given" do
+        it "should locate the button" do
+          running do
+            @session.click_button('click_me_123')
+          end.should_not raise_error(Capybara::ElementNotFound)
+        end
+      end
+
+      context "with value given" do
+        it "should locate the button" do
+          running do
+            @session.click_button('click_me')
+          end.should_not raise_error(Capybara::ElementNotFound)
+        end
+      end
+
+    end
+
     context "with a locator that doesn't exist" do
       it "should raise an error" do
         running do

spec/views/buttons.erb

@@ -0,0 +1,4 @@
+<h1>Buttons</h1>
+<button>Click me!</button>
+<button id="click_me_123">Click me by id!</button>
+<button value="click_me">Click me by value!</button>