Show/hide entire OpenID form

test/system/user_signup_test.rb

@@ -8,4 +8,16 @@ class UserSignupTest < ApplicationSystemTestCase
 
     assert_content "Confirm Password"
   end
+
+  test "Show OpenID form when OpenID provider button is clicked" do
+    visit login_path
+
+    assert_no_field "OpenID URL"
+    assert_no_button "Continue"
+
+    click_on "Log in with OpenID"
+
+    assert_field "OpenID URL"
+    assert_button "Continue"
+  end
 end