raise if `anchor` is passed to `scope`

The `anchor` parameter [is overridden](https://github.com/rails/rails/blob/b4b4a611d0eb9aa1c640c5f521c6a43bf2a65bab/actionpack/lib/action_dispatch/routing/mapper.rb#L1528) unless it
is directly passed to `match`, so setting it in a scope must be a
mistake.

1 files changed, 9 insertions, 0 deletions

diff --git a/actionpack/test/dispatch/mapper_test.rb b/actionpack/test/dispatch/mapper_test.rb
index 6ce0e34ec3..8734380008 100644
--- a/actionpack/test/dispatch/mapper_test.rb
+++ b/actionpack/test/dispatch/mapper_test.rb
@@ -44,6 +44,15 @@ module ActionDispatch
         Mapper.new FakeSet.new
       end
 
+      def test_scope_raises_on_anchor
+        fakeset = FakeSet.new
+        mapper = Mapper.new fakeset
+        assert_raises(ArgumentError) do
+          mapper.scope(anchor: false) do
+          end
+        end
+      end
+
       def test_blows_up_without_via
         fakeset = FakeSet.new
         mapper = Mapper.new fakeset