[test] Introduce ability to test with different Rack versions to the default/bundled Rack

.github/workflows/maven.yml

@@ -10,16 +10,18 @@ env:
   # Default versions for canonical release build
   DEFAULT_JAVA_VERSION: '8'
   DEFAULT_JRUBY_VERSION: '9.4.13.0' # Should match pom.xml <jruby.version> property (AND a version inside the test matrix)
+  DEFAULT_RACK_VERSION: '~> 2.2' # Should match Gemfile (AND a version inside the test matrix)
 
 jobs:
   build:
-    name: JRuby ${{ matrix.jruby_version }} / Java ${{ matrix.java_version }}
+    name: Rack ${{ matrix.rack_version }} on JRuby ${{ matrix.jruby_version }} / Java ${{ matrix.java_version }}
     runs-on: ubuntu-latest
 
     strategy:
       matrix:
         jruby_version: [ '9.4.13.0', '10.0.2.0' ]
         java_version: [ '8', '11', '17', '21' ]
+        rack_version: [ '~> 2.2' ]
         exclude:
           - jruby_version: '10.0.2.0'
             java_version: '8'  # JRuby 10 requires Java 21
@@ -41,31 +43,42 @@ jobs:
 
     - name: Build with Maven
       run: ./mvnw -B install -Djruby.version=${{ matrix.jruby_version }}
+      env:
+        RACK_VERSION: ${{ matrix.rack_version }}
 
     # Uploads the full dependency graph to GitHub to improve the quality of Dependabot alerts this repository can receive
     - name: Update dependency graph
       uses: advanced-security/maven-dependency-submission-action@b275d12641ac2d2108b2cbb7598b154ad2f2cee8 # v5.0.0
-      if: github.ref == 'refs/heads/master' && matrix.java_version == env.DEFAULT_JAVA_VERSION && matrix.jruby_version == env.DEFAULT_JRUBY_VERSION
+      if: github.ref == 'refs/heads/master' && matrix.java_version == env.DEFAULT_JAVA_VERSION && matrix.jruby_version == env.DEFAULT_JRUBY_VERSION && matrix.rack_version == env.DEFAULT_RACK_VERSION
 
   appraisals:
     needs: build
-    name: ${{ matrix.appraisal }} appraisal on ${{ matrix.jruby_version }} / Java ${{ matrix.java_version }}
+    name: ${{ matrix.appraisal }} on ${{ matrix.jruby_version }} / Java ${{ matrix.java_version }}
     runs-on: ubuntu-latest
 
     strategy:
       matrix:
+        appraisal: [
+          'rails50_rack22',
+          'rails52_rack22',
+          'rails60_rack22',
+          'rails61_rack22',
+          'rails70_rack22',
+          'rails71_rack22',
+          'rails72_rack22',
+          'rails80_rack22',
+        ]
         jruby_version: [ '9.4.13.0', '10.0.2.0' ]
         java_version: [ '8', '11', '17', '21' ]
-        appraisal: [ 'rails50', 'rails52', 'rails60', 'rails61', 'rails70', 'rails71', 'rails72', 'rails80' ]
         exclude:
-          - jruby_version: '9.4.13.0'
-            appraisal: 'rails80' # Requires Ruby 3.4 compatibility, which JRuby 9.4 does not support
           - jruby_version: '10.0.2.0'
             java_version: '8'  # JRuby 10 requires Java 21
           - jruby_version: '10.0.2.0'
             java_version: '11' # JRuby 10 requires Java 21
           - jruby_version: '10.0.2.0'
             java_version: '17' # JRuby 10 requires Java 21
+          - appraisal: 'rails80_rack22'
+            jruby_version: '9.4.13.0' # Rails 8 requires Ruby 3.4 compatibility, which JRuby 9.4 does not support
       fail-fast: false
 
     env:

.gitignore

@@ -12,3 +12,4 @@ examples/*/nbproject
 nbproject
 .idea/
 .rvmrc
+gemfiles/*.lock

Appraisals

@@ -1,31 +1,24 @@
-appraise "rails50" do
-  gem "rails", "~> 5.0.0"
-end
-
-appraise "rails52" do
-  gem "rails", "~> 5.2.0"
-end
+version_spec = ->(prefix, desc) { "~> #{desc.split(prefix).last.insert(1, ".")}.0" }
 
-appraise "rails60" do
-  gem "rails", "~> 6.0.0"
-end
-
-appraise "rails61" do
-  gem "rails", "~> 6.1.0"
-end
+# Rails version -> rack versions in format
+# rails#{MAJOR}#{MINOR} => %w[ rack#{MAJOR}#{MINOR} ]
+{
+    "rails50" => %w[rack22],
+    "rails52" => %w[rack22],
+    "rails60" => %w[rack22],
+    "rails61" => %w[rack22],
+    "rails70" => %w[rack22],
+    "rails71" => %w[rack22],
+    "rails72" => %w[rack22],
+    "rails80" => %w[rack22]
+}.each do |rails_desc, rack_descs|
+  rack_descs.each do |rack_desc|
 
-appraise "rails70" do
-  gem "rails", "~> 7.0.0"
+    appraise "#{rails_desc}_#{rack_desc}" do
+      group :default do
+        gem "rack", version_spec.call("rack", rack_desc)
+        gem "rails", version_spec.call("rails", rails_desc)
+      end
+    end
+  end
 end
-
-appraise "rails71" do
-  gem "rails", "~> 7.1.0"
-end
-
-appraise "rails72" do
-  gem "rails", "~> 7.2.0"
-end
-
-appraise "rails80" do
-  gem "rails", "~> 8.0.0"
-end

gemfiles/rails50.gemfile → gemfiles/rails50_rack22.gemfile

@@ -4,10 +4,10 @@ source "https://rubygems.org"
 
 gem "rake", "~> 13.3", group: :test, require: nil
 gem "rspec", group: :test
-gem "rails", "~> 5.0.0"
 
 group :default do
-  gem "rack", "~> 2.2"
+  gem "rack", "~> 2.2.0"
+  gem "rails", "~> 5.0.0"
 end
 
 group :development do