TreeManager classes deep-copy their statements.

1 files changed, 11 insertions, 0 deletions

diff --git a/spec/arel/select_manager_spec.rb b/spec/arel/select_manager_spec.rb
index 01d1b35004..3984bec3fd 100644
--- a/spec/arel/select_manager_spec.rb
+++ b/spec/arel/select_manager_spec.rb
@@ -166,5 +166,16 @@ module Arel
         manager.to_sql.should be_like 'SELECT "users"."id" FROM "users"'
       end
     end
+
+    describe "TreeManager" do
+      subject do
+        table   = Table.new :users
+        Arel::SelectManager.new(Table.engine).tap do |manager|
+          manager.from(table).project(table['id'])
+        end
+      end
+
+      it_should_behave_like "TreeManager"
+    end
   end
 end