Fix controller tests and SQLite compatibility for defaults_diff

Test infrastructure:
- Allow www.example.com host in test env (ActionDispatch::HostAuthorization
  was blocking all integration test requests)
- Include Devise::Test::IntegrationHelpers in ActionDispatch::IntegrationTest
  so tests can sign in with sign_in(user)

Controller tests:
- Rewrite UsersControllerTest to match actual routes/actions (no new/create/
  edit/destroy); sign in as admin; test update-self rejection via turbo_stream
- Fix Default::UnitsControllerTest to sign in before requesting the index

SQLite compatibility in Unit#defaults_diff:
- Hoist the inner "units" CTE to the outer WITH RECURSIVE level (fixes nested
  WITH syntax error) — this was the existing TODO in the code
- Use Unit.joins(...) for the recursive part instead of a raw Arel::SelectManager
  so the SQLite visitor does not wrap it in parentheses inside UNION ALL
- Drop the named "units" CTE (conflicts with the table name under WITH RECURSIVE
  in SQLite); apply the user/defaults scope directly on the base case
- Qualify GROUP BY columns to avoid ambiguity when bases_units is joined
- Qualify ORDER BY :multiplier/:symbol to avoid ambiguity (Unit.ordering)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/models/unit.rb

@@ -26,10 +26,8 @@ class Unit < ApplicationRecord
     other_bases_units = arel_table.alias('other_bases_units')
     sub_units = arel_table.alias('sub_units')
 
-    # TODO: move inner 'with' CTE to outer 'with recursive' - it can have multiple
-    # CTEs, even non recursive ones.
     Unit.with_recursive(actionable_units: [
-      Unit.with(units: self.or(Unit.defaults)).left_joins(:base)
+      self.or(Unit.defaults).left_joins(:base)
         .where.not(
           # Exclude Units that are/have default counterpart
           Arel::SelectManager.new.project(1).from(other_units)
@@ -65,8 +63,14 @@ class Unit < ApplicationRecord
         ),
       # Fill base Units to display proper hierarchy. Duplicates will be removed
       # by final group() - can't be deduplicated with UNION due to 'portable' field.
-      arel_table.join(actionable_units).on(actionable_units[:base_id].eq(arel_table[:id]))
-        .project(arel_table[Arel.star], Arel::Nodes.build_quoted(nil).as('portable'))
+      # Use ActiveRecord::Relation (not a raw SelectManager) so the SQLite Arel
+      # visitor does not wrap it in parentheses inside the UNION ALL CTE body.
+      Unit.joins(
+        arel_table.create_join(
+          actionable_units,
+          arel_table.create_on(actionable_units[:base_id].eq(arel_table[:id]))
+        )
+      ).select(arel_table[Arel.star], Arel::Nodes.build_quoted(nil).as('portable'))
     ]).select(units: [:base_id, :symbol])
       .select(
         units[:id].minimum.as('id'), # can be ANY_VALUE()
@@ -74,7 +78,7 @@ class Unit < ApplicationRecord
         Arel::Nodes.build_quoted(1).as('multiplier'), # disregard multiplier when sorting
         units[:portable].minimum.as('portable')
       )
-      .from(units).group(:base_id, :symbol)
+      .from(units).group(units[:base_id], units[:symbol])
   }
   scope :ordered, ->{
     left_outer_joins(:base).order(ordering)
@@ -83,8 +87,8 @@ class Unit < ApplicationRecord
   def self.ordering
     [arel_table.coalesce(Arel::Table.new(:bases_units)[:symbol], arel_table[:symbol]),
      arel_table[:base_id].not_eq(nil),
-     :multiplier,
-     :symbol]
+     arel_table[:multiplier],
+     arel_table[:symbol]]
   end
 
   before_destroy do

config/environments/test.rb

@@ -58,4 +58,7 @@ Rails.application.configure do
   # config.action_view.annotate_rendered_view_with_filenames = true
 
   config.log_level = :info
+
+  # Allow the default integration test host.
+  config.hosts << "www.example.com"
 end

test/controllers/default/units_controller_test.rb

@@ -1,8 +1,12 @@
 require "test_helper"
 
 class Default::UnitsControllerTest < ActionDispatch::IntegrationTest
+  setup do
+    sign_in users(:alice)
+  end
+
   test "should get index" do
-    get units_defaults_index_url
+    get default_units_url
     assert_response :success
   end
 end

test/controllers/users_controller_test.rb

@@ -2,7 +2,9 @@ require "test_helper"
 
 class UsersControllerTest < ActionDispatch::IntegrationTest
   setup do
-    @user = users(:one)
+    @admin = users(:admin)
+    @user = users(:alice)
+    sign_in @admin
   end
 
   test "should get index" do
@@ -10,39 +12,25 @@ class UsersControllerTest < ActionDispatch::IntegrationTest
     assert_response :success
   end
 
-  test "should get new" do
-    get new_user_url
-    assert_response :success
-  end
-
-  test "should create user" do
-    assert_difference("User.count") do
-      post users_url, params: { user: { email: @user.email, status: @user.status } }
-    end
-
-    assert_redirected_to user_url(User.last)
-  end
-
   test "should show user" do
     get user_url(@user)
     assert_response :success
   end
 
-  test "should get edit" do
-    get edit_user_url(@user)
-    assert_response :success
-  end
-
   test "should update user" do
-    patch user_url(@user), params: { user: { email: @user.email, status: @user.status } }
-    assert_redirected_to user_url(@user)
+    patch user_url(@user), params: { user: { status: :restricted } }, as: :turbo_stream
+    assert_equal "restricted", @user.reload.status
   end
 
-  test "should destroy user" do
-    assert_difference("User.count", -1) do
-      delete user_url(@user)
+  test "should not update self" do
+    patch user_url(@admin), params: { user: { status: :active } }, as: :turbo_stream,
+      headers: { "HTTP_REFERER" => users_url }
+    assert_response :redirect
   end
 
-    assert_redirected_to users_url
+  test "should forbid non-admin" do
+    sign_in @user
+    get users_url
+    assert_response :forbidden
   end
 end

test/test_helper.rb

@@ -2,6 +2,10 @@ ENV["RAILS_ENV"] ||= "test"
 require_relative "../config/environment"
 require "rails/test_help"
 
+class ActionDispatch::IntegrationTest
+  include Devise::Test::IntegrationHelpers
+end
+
 class ActiveSupport::TestCase
   # Run tests in parallel with specified workers
   parallelize(workers: :number_of_processors)