Introduce appraisals to allow easy testing with supported Rails versions

Author: mvz

.gitignore

@@ -1,5 +1,6 @@
 .bundle/
 Gemfile.lock
+gemfiles/*.lock
 coverage/
 log/*.log
 pkg/

Appraisals

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+# HACK: This uses odd syntax to make appraisal customization work on newer Rubies.
+# See https://github.com/thoughtbot/appraisal/pull/214. Once that one has been
+# released, we should use customize_gemfiles instead.
+Customize.new heading: <<~HEADING.chomp
+  frozen_string_literal: true
+
+  This file was generated by Appraisal
+HEADING
+
+appraise "rails_61" do
+  gem "rails", "~> 6.1.0"
+end
+
+appraise "rails_70" do
+  gem "rails", "~> 7.0.0"
+end
+
+appraise "rails_71" do
+  gem "rails", "~> 7.1.0"
+end

gemfiles/rails_61.gemfile

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "publify_core", git: "https://github.com/publify/publify_core.git"
+gem "rails", "~> 6.1.0"
+
+gemspec path: "../"

gemfiles/rails_70.gemfile

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "publify_core", git: "https://github.com/publify/publify_core.git"
+gem "rails", "~> 7.0.0"
+
+gemspec path: "../"

gemfiles/rails_71.gemfile

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "publify_core", git: "https://github.com/publify/publify_core.git"
+gem "rails", "~> 7.1.0"
+
+gemspec path: "../"

publify_textfilter_code.gemspec

@@ -22,7 +22,8 @@ Gem::Specification.new do |s|
   s.add_dependency "htmlentities", "~> 4.3"
   s.add_dependency "publify_core", "~> 10.0.0"
 
-  s.add_development_dependency "rspec-rails", "~> 7.1"
+  s.add_development_dependency "appraisal", "~> 2.3"
+  s.add_development_dependency "rspec-rails", "~> 6.0"
   s.add_development_dependency "rubocop", "~> 1.77.0"
   s.add_development_dependency "rubocop-performance", "~> 1.23.1"
   s.add_development_dependency "rubocop-rails", "~> 2.32.0"