Use minitest-stub-const for temporary constant stubbing

- Replaces the ad-hoc `with_const` helper in test_factories.rb
  with `Object.stub_const`, keeping the block-scoped restore
  semantics without rolling our own.

Author: mostlyobvious

Gemfile

@@ -10,6 +10,7 @@ gem "rake"
 gem "m"
 gem "minitest"
 gem "minitest-mock"
+gem "minitest-stub-const"
 gem "mutant-minitest"
 gem "concurrent-ruby"
 gem "pg-ephemeral"

Gemfile.lock

@@ -51,6 +51,7 @@ GEM
       drb (~> 2.0)
       prism (~> 1.5)
     minitest-mock (5.27.0)
+    minitest-stub-const (0.6)
     mutant (0.16.3)
       diff-lcs (>= 1.6, < 3)
       irb (~> 1.15)
@@ -126,6 +127,7 @@ DEPENDENCIES
   m
   minitest
   minitest-mock
+  minitest-stub-const
   mutant-minitest
   pg-ephemeral
   rake
@@ -155,6 +157,7 @@ CHECKSUMS
   m (1.7.0) sha256=058f793da8150c51353cc59366ffae7774683e868bede3c78f81d920fb9d633a
   minitest (6.0.6) sha256=153ea36d1d987a62942382b61075745042a2b3123b1cd48f4c3675af9cc7d6f1
   minitest-mock (5.27.0) sha256=7040ed7185417a966920987eaa6eaf1be4ea1fc5b25bb03ff4703f98564a55b0
+  minitest-stub-const (0.6) sha256=b39f34dd6b8e7045fcc36820083aceaa68075318e4c4f365b12f11bd5f34b279
   mutant (0.16.3) sha256=7e10fb09b80a78d82f8e38283fc1e4d562cbb1392451e2a21611ea2bc44b5023
   mutant-minitest (0.16.3) sha256=504d110c1bd503528a7e57a4f062960e571bba4e3939e4a66ddc0f75d2071d90
   mutex_m (0.3.0) sha256=cfcb04ac16b69c4813777022fdceda24e9f798e48092a2b817eb4c0a782b0751

test/test_factories.rb

@@ -21,7 +21,7 @@ def test_for_active_record_round_trips_with_default_model
     end
 
     def test_for_active_record_round_trips_with_custom_model
-      with_const(:DasModel, Class.new(ActiveRecord::Base)) do
+      Object.stub_const(:DasModel, Class.new(ActiveRecord::Base)) do
         assert_round_trip(EventStore.for_active_record(DasModel))
       end
     end
@@ -41,13 +41,6 @@ def test_event_store_does_not_conflict_with_public_schema_tables
 
     private
 
-    def with_const(name, value)
-      Object.const_set(name, value)
-      yield
-    ensure
-      Object.__send__(:remove_const, name)
-    end
-
     def assert_round_trip(event_store)
       event = Event.new(type: "FactoryTested")
 

test/test_helper.rb

@@ -2,6 +2,7 @@
 
 require "minitest/autorun"
 require "minitest/mock"
+require "minitest/stub_const"
 require "mutant/minitest/coverage"
 
 # optional dependencies