Fix test suite loading and add GitHub Actions CI

The test suite failed to load: ActiveSupport 8.1's
active_support/testing/autorun now calls `Minitest.load :rails`, which
requires railties' minitest/rails_plugin. This gem depends only on
activerecord (not the full Rails), so railties is absent from the bundle
and the require raised LoadError (surfaced by minitest 6 adding
Minitest.load). Use plain minitest/autorun, the conventional choice for a
non-Rails gem, instead of pulling in railties.

Also rename the duplicate `test_polygon_with_hole` (the second definition
silently shadowed the first) to `test_collection` so the geometry
collection case runs as its own test.

Add a CI workflow running the suite against a postgis/postgis service
container on Ruby 3.2-3.4, installing libgeos-dev before bundle install so
rgeo's CAPI extension compiles.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: waratuman

.github/workflows/ci.yml

@@ -0,0 +1,52 @@
+name: CI
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    services:
+      postgres:
+        image: postgis/postgis:16-3.4
+        env:
+          POSTGRES_USER: postgres
+          POSTGRES_PASSWORD: postgres
+          POSTGRES_DB: postgis_adapter_test
+        ports:
+          - 5432:5432
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+
+    env:
+      PGHOST: localhost
+      PGPORT: 5432
+      PGUSER: postgres
+      PGPASSWORD: postgres
+
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby: ['3.2', '3.3', '3.4']
+
+    steps:
+      - uses: actions/checkout@v4
+
+      # rgeo's CAPI extension links against GEOS at build time, so libgeos-dev
+      # must be present before `bundle install` compiles the native extension.
+      - name: Install GEOS
+        run: sudo apt-get update && sudo apt-get install -y libgeos-dev
+
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+          bundler-cache: true
+
+      - name: Run tests
+        run: bundle exec rake test

test/cases/adapters/postgis/geometry_test.rb

@@ -27,7 +27,7 @@ def test_polygon_with_hole
     assert_equal "POLYGON ((0 0, 10 0, 10 10, 0 10, 0 0), (1 1, 1 2, 2 2, 2 1, 1 1))", geo.polygon_with_hole.as_text
   end
 
-  def test_polygon_with_hole
+  def test_collection
     geo = Geo.create(collection: 'GEOMETRYCOLLECTION(POINT(2 0),POLYGON((0 0, 1 0, 1 1, 0 1, 0 0)))')
     assert geo.collection.is_a?(RGeo::Geos::CAPIGeometryCollectionImpl)
     assert_equal "GEOMETRYCOLLECTION (POINT (2 0), POLYGON ((0 0, 1 0, 1 1, 0 1, 0 0)))", geo.collection.as_text

test/cases/helper.rb

@@ -3,7 +3,8 @@
 require "postgis_adapter"
 
 require "active_support"
-require "active_support/testing/autorun"
+require "active_support/test_case"
+require "minitest/autorun"
 
 ActiveRecord::Base.logger = ActiveSupport::Logger.new("debug.log", 0, 100 * 1024 * 1024)
 ActiveRecord::Base.configurations = ActiveRecord::DatabaseConfigurations.new({