Add minitest test suite and CI workflow

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby: ['3.2', '3.3', '3.4']
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+          bundler-cache: true
+
+      - name: Run tests
+        run: bundle exec rake test

.gitignore

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+/coverage/
+/.bundle/
+/vendor/bundle/
+*.gem
+.rspec_status

Rakefile

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+# frozen_string_literal: true
+
+require 'bundler/gem_tasks'
+require 'rake/testtask'
+
+Rake::TestTask.new(:test) do |t|
+  t.libs << 'test'
+  t.libs << 'lib'
+  t.test_files = FileList['test/**/test_*.rb'].exclude('test/test_helper.rb')
+  t.verbose = true
+end
+
+task default: :test

test/faker/test_version.rb

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+# frozen_string_literal: true
+
+require_relative '../test_helper'
+
+class TestFakerVersion < Test::Unit::TestCase
+  def test_version_is_defined
+    assert defined?(Faker::VERSION)
+  end
+
+  def test_version_is_a_string
+    assert_instance_of String, Faker::VERSION
+  end
+
+  def test_version_matches_semver_format
+    assert_match(/\A\d+\.\d+\.\d+\z/, Faker::VERSION)
+  end
+
+  def test_version_matches_gemspec
+    gemspec_path = File.expand_path('../../faker.gemspec', __dir__)
+    spec = Gem::Specification.load(gemspec_path)
+    assert_equal spec.version.to_s, Faker::VERSION
+  end
+end

test/test_helper.rb

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+# frozen_string_literal: true
+
+require 'simplecov'
+
+SimpleCov.start do
+  add_filter ['.bundle', 'lib/extensions', 'test']
+end
+
+require 'minitest/autorun'
+require 'test/unit'
+require 'rubygems'
+
+require File.expand_path("#{File.dirname(__FILE__)}/../lib/faker/version")