ci: test against Faraday 1.x and 2.x

Add a gemfile matrix axis so CI proves dual compatibility on both Faraday majors
against the same Elasticsearch versions. The faraday_2 lane pulls faraday-retry
(the :retry middleware that left core) for the retry coverage.

Author: Tonkpils

.github/workflows/main.yml

@@ -12,11 +12,14 @@ jobs:
     strategy:
       matrix:
         ruby-version: ['3.2']
+        gemfile: ['faraday_1', 'faraday_2']
         ES_VERSION: ['8.18.0']
         include:
           - ES_VERSION: '8.18.0'
             ES_DOWNLOAD_URL: >-
               https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-8.18.0-linux-x86_64.tar.gz
+    env:
+      BUNDLE_GEMFILE: ${{ github.workspace }}/gemfiles/${{ matrix.gemfile }}.gemfile
     steps:
       - uses: ruby/setup-ruby@v1
         with:

.gitignore

@@ -6,6 +6,7 @@
 /vendor/cache/*.gem
 /coverage
 Gemfile.lock
+gemfiles/*.lock
 *.gem
 tags
 .byebug_history

gemfiles/faraday_1.gemfile

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+# Tests elastomer-client against Faraday 1.x.
+#
+# faraday-gzip works on both Faraday 1.x and 2.x and provides the :gzip request middleware
+# used for response decompression (replacing the deprecated faraday_middleware).
+source "https://rubygems.org"
+
+gem "faraday", "~> 1.10"
+
+gemspec path: ".."
+
+group :development do
+  gem "activesupport", ">= 7.0"
+  gem "bundler", "~> 2.0"
+  gem "debug", "~> 1.7"
+  gem "minitest", "~> 5.17"
+  gem "minitest-focus", "~> 1.3"
+  gem "rake"
+  gem "rubocop", "~> 1.63.0"
+  gem "rubocop-github", "~> 0.20.0"
+  gem "rubocop-minitest", "~> 0.35.0"
+  gem "rubocop-performance", "~> 1.21.0"
+  gem "rubocop-rake", "~> 0.6.0"
+  gem "simplecov", require: false
+  gem "webmock", "~> 3.5"
+end

gemfiles/faraday_2.gemfile

@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+# Tests elastomer-client against Faraday 2.x.
+#
+# This is the configuration the monolith targets after the Faraday 2 upgrade. faraday-gzip
+# provides the :gzip request middleware (response decompression) on Faraday 2.x.
+source "https://rubygems.org"
+
+gem "faraday", "~> 2.0"
+
+gemspec path: ".."
+
+group :development do
+  gem "activesupport", ">= 7.0"
+  gem "bundler", "~> 2.0"
+  gem "debug", "~> 1.7"
+  # On Faraday 2.x the :retry middleware lives in the faraday-retry gem (it is in core on
+  # 1.x). Consumers opt into retries via a connection block; the suite covers that path.
+  gem "faraday-retry", require: "faraday/retry"
+  gem "minitest", "~> 5.17"
+  gem "minitest-focus", "~> 1.3"
+  gem "rake"
+  gem "rubocop", "~> 1.63.0"
+  gem "rubocop-github", "~> 0.20.0"
+  gem "rubocop-minitest", "~> 0.35.0"
+  gem "rubocop-performance", "~> 1.21.0"
+  gem "rubocop-rake", "~> 0.6.0"
+  gem "simplecov", require: false
+  gem "webmock", "~> 3.5"
+end