Try valgrind

.github/workflows/build.yml

@@ -9,15 +9,12 @@ jobs:
         include:
           - ruby: 3.3
             os: ubuntu-22.04
-          - ruby: 3.2
-            os: macos-14
-          - ruby: 3.1
-            os: macos-13
     steps:
       - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}
           bundler-cache: true
       - run: bundle exec rake compile
-      - run: bundle exec rake test
+      - run: sudo apt-get update && sudo apt-get install valgrind
+      - run: bundle exec rake test:valgrind

Gemfile

@@ -5,3 +5,4 @@ gemspec
 gem "rake"
 gem "rake-compiler"
 gem "minitest", ">= 5"
+gem "ruby_memcheck"

Rakefile

@@ -1,12 +1,17 @@
 require "bundler/gem_tasks"
 require "rake/testtask"
 require "rake/extensiontask"
+require "ruby_memcheck"
 
 task default: :test
-Rake::TestTask.new do |t|
+test_config = lambda do |t|
   t.libs << "test"
   t.pattern = "test/**/*_test.rb"
 end
+Rake::TestTask.new(:test, &test_config)
+namespace :test do
+  RubyMemcheck::TestTask.new(:valgrind, &test_config)
+end
 
 Rake::ExtensionTask.new("or-tools") do |ext|
   ext.name = "ext"