Add test case for mixed sibling (class and module)

Co-authored-by: kwerle <23320+kwerle@users.noreply.github.com>

Author: Copilot

spec/lib/ruby_language_server/scope_parser_spec.rb

@@ -218,6 +218,41 @@ class Baz
 
         include_examples 'sibling scopes', 'class'
       end
+
+      describe 'mixed (class and module)' do
+        let(:scope_parser) do
+          RubyLanguageServer::ScopeParser.new(<<-RUBY)
+          module Foo
+            class Bar
+            end
+            module Baz
+            end
+          end
+          RUBY
+        end
+
+        it 'should place sibling class and module at the same level' do
+          foo = scope_parser.root_scope.children.first
+          assert_equal('Foo', foo.name)
+
+          # Both Bar (class) and Baz (module) should be children of Foo
+          children = foo.children
+          assert_equal(2, children.size, "Foo should have 2 children, but has #{children.size}")
+
+          bar = children.detect { |c| c.name == 'Bar' }
+          baz = children.detect { |c| c.name == 'Baz' }
+
+          assert_not_nil(bar, "Bar should be a child of Foo")
+          assert_not_nil(baz, "Baz should be a child of Foo")
+
+          # Verify types are different
+          assert_equal(:class, bar.type, "Bar should be a class")
+          assert_equal(:module, baz.type, "Baz should be a module")
+
+          # Verify Baz is not a child of Bar
+          assert_equal(0, bar.children.size, "Bar should have no children, but has #{bar.children.size}")
+        end
+      end
     end
   end
 end