PathChecker should not attempt to validate invalid routes, closes #1505

lib/devise/path_checker.rb

@@ -12,7 +12,8 @@ module Devise
     end
 
     def signing_out?
-      @current_path == send("destroy_#{@scope}_session_path")
+      route = "destroy_#{@scope}_session_path"
+      respond_to?(route) && @current_path == send(route)
     end
   end
 end

test/path_checker_test.rb

@@ -0,0 +1,21 @@
+require 'test_helper'
+
+class PathCheckerTest < ActiveSupport::TestCase
+  test 'check if sign out path matches' do
+    path_checker = Devise::PathChecker.new({"PATH_INFO" => "/users/sign_out"}, :user)
+    assert path_checker.signing_out?
+
+    path_checker = Devise::PathChecker.new({"PATH_INFO" => "/users/sign_in"}, :user)
+    assert_not path_checker.signing_out?
+  end
+
+  test 'considers script name' do
+    path_checker = Devise::PathChecker.new({"SCRIPT_NAME" => "/users", "PATH_INFO" => "/sign_out"}, :user)
+    assert path_checker.signing_out?
+  end
+
+  test 'ignores invalid routes' do
+    path_checker = Devise::PathChecker.new({"PATH_INFO" => "/users/sign_in"}, :omg)
+    assert_not path_checker.signing_out?
+  end
+end