ci: test against Ruby 4.0 and ruby-head (#133)

* ci: test against Ruby 3.5 and ruby-head

Extend the CI matrix to cover newer Ruby versions so we catch
incompatibilities early. Adds Ruby 3.5 to the supported matrix and
a non-blocking ruby-head build (continue-on-error) to surface
upcoming breakage without failing the suite.

Also sets fail-fast: false so one version failing doesn't cancel the
rest of the matrix.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* ci: target Ruby 4.0 stable instead of 3.5

Ruby 3.5 never shipped as a stable release; the December 2025 release
was branded Ruby 4.0. Point the matrix at the actual current stable
(4.0) instead of the 3.5 preview line.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* deps: support Ruby 4.0 (ostruct, terminal-table 4.0, loosen linters)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* deps: keep terminal-table ~> 3.0 for Ruby 2.6/2.7 compatibility

terminal-table 4.0 requires unicode-display_width ~> 3.0, which conflicts
with every rubocop that still supports Ruby 2.7 (needs < 3.0). Bundler
silently backtracked rubocop to 0.7.2, which lacks rubocop/rake_task and
broke the suite on 2.6/2.7. terminal-table 3.x works on Ruby 4.0, so the
4.0 bump was unnecessary.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* test: reset Skunk::Config to fix order-dependent formats test

Skunk::Config is a process-global singleton. config_test.rb mutated
Config.formats but only reset in setup, so it leaked [:html, :json] into
other files. Under minitest's randomized order this intermittently failed
argv_test.rb's 'defaults to console format' expectation (seen on the
Ruby 3.2 CI job). Reset Config in config_test teardown and before/after
the argv formats tests so the suite is order-independent.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: etagwerker

.github/workflows/main.yml

@@ -6,10 +6,16 @@ on: [push, pull_request]
 jobs:
   test-ruby:
     runs-on: ${{ matrix.os }}-latest
+    continue-on-error: ${{ matrix.experimental || false }}
     strategy:
+      fail-fast: false
       matrix:
         os: [ubuntu]
-        ruby-version: ["2.6", "2.7", "3.0", "3.1", "3.2", "3.3", "3.4"]
+        ruby-version: ["2.6", "2.7", "3.0", "3.1", "3.2", "3.3", "3.4", "4.0"]
+        include:
+          - os: ubuntu
+            ruby-version: "head"
+            experimental: true
     steps:
       - uses: actions/checkout@v2
       - name: Setup Ruby ${{ matrix.ruby-version }}

Gemfile

@@ -7,5 +7,5 @@ git_source(:github) { |repo_name| "https://github.com/#{repo_name}" }
 # Specify your gem's dependencies in skunk.gemspec
 gemspec
 
-gem "reek", "~> 6.1"
-gem "rubocop", "~> 1.48"
+gem "reek"
+gem "rubocop"

skunk.gemspec

@@ -38,12 +38,12 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
+  spec.add_dependency "ostruct", "~> 0.6"
   spec.add_dependency "path_expander", "< 2.0"
   spec.add_dependency "rubycritic", ">= 4.5.2", "< 5.0"
   spec.add_dependency "terminal-table", "~> 3.0"
 
   spec.add_development_dependency "codecov", "~> 0.1.16"
-  spec.add_development_dependency "debug"
   spec.add_development_dependency "minitest", "< 6"
   spec.add_development_dependency "minitest-around", "~> 0.5.0"
   spec.add_development_dependency "minitest-stub_any_instance", "~> 1.0.2"

test/lib/skunk/cli/options/argv_test.rb

@@ -26,6 +26,10 @@
   end
 
   describe "#formats" do
+    before do
+      Skunk::Config.reset
+    end
+
     after do
       Skunk::Config.reset
     end

test/lib/skunk/config_test.rb

@@ -11,6 +11,12 @@ def setup
       Config.reset
     end
 
+    # Reset again after each test so the global singleton does not leak
+    # mutated formats into tests in other files (minitest randomizes order)
+    def teardown
+      Config.reset
+    end
+
     def test_default_format
       assert_equal [:console], Config.formats
     end