Require readline-ext when testing with Ruby 3.3

In ruby 3.3, requiring readline does not load the real readline library
but falls back to reline by default. This creates odd output when the
terminal is not a real TTY, making the interactive debugging scenario
fail.

See #910 for details. Also, see
ruby/reline#616 for the resulting reline
issue.

As a workaround, add the readline-ext gem which tries to use the real
readline as was the default in Ruby 3.2 and earlier.

Appraisals

@@ -2,8 +2,14 @@
 
 appraise "cucumber_8" do
   gem "cucumber", "~> 8.0"
+
+  # Work-around for https://github.com/ruby/reline/issues/616 in Ruby 3.3
+  gem "readline-ext", "~> 0.2.0", platforms: :mri_33
 end
 
 appraise "cucumber_9" do
   gem "cucumber", ["~> 9.0", ">= 9.0.1"]
+
+  # Work-around for https://github.com/ruby/reline/issues/616 in Ruby 3.3
+  gem "readline-ext", "~> 0.2.0", platforms: :mri_33
 end

Gemfile

@@ -3,6 +3,9 @@ source "https://rubygems.org"
 # Use dependencies from gemspec
 gemspec
 
+# Work-around for https://github.com/ruby/reline/issues/616 in Ruby 3.3
+gem "readline-ext", "~> 0.2.0", platforms: :mri_33
+
 # Load local Gemfile
 if File.file? File.expand_path("Gemfile.local", __dir__)
   load File.expand_path("Gemfile.local", __dir__)

gemfiles/cucumber_8.gemfile

@@ -2,6 +2,7 @@
 
 source "https://rubygems.org"
 
+gem "readline-ext", "~> 0.2.0", platforms: :mri_33
 gem "cucumber", "~> 8.0"
 
 gemspec path: "../"

gemfiles/cucumber_9.gemfile

@@ -2,6 +2,7 @@
 
 source "https://rubygems.org"
 
+gem "readline-ext", "~> 0.2.0", platforms: :mri_33
 gem "cucumber", ["~> 9.0", ">= 9.0.1"]
 
 gemspec path: "../"