Fix test for the edge generator

railties/test/generators/app_generator_test.rb

@@ -606,7 +606,7 @@ def test_dev_option
 
   def test_edge_option
     assert_generates_with_bundler edge: true
-    assert_file "Gemfile", %r{^gem\s+["']rails["'],\s+github:\s+["']#{Regexp.escape("rails/rails")}["'],\s+branch:\s+["']#{Regexp.escape("5-0-stable")}["']$}
+    assert_file "Gemfile", %r{^gem\s+["']rails["'],\s+github:\s+["']#{Regexp.escape("rails/rails")}["']$}
   end
 
   def test_spring