Support Ruby 3.2 (#330)

Author: moskvin

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby-version: ['2.6', '2.7', '3.0', '3.1']
+        ruby-version: ['2.6', '2.7', '3.0', '3.1', '3.2']
 
     steps:
     - uses: actions/checkout@v2

.rspec

@@ -1,2 +1,3 @@
 --color
 --format progress
+--require spec_helper

puffing-billy.gemspec

@@ -16,7 +16,7 @@ Gem::Specification.new do |gem|
   gem.license       = 'MIT'
 
   gem.add_development_dependency 'rspec'
-  gem.add_development_dependency 'thin'
+  gem.add_development_dependency 'thin', '~> 1.8.1'
   gem.add_development_dependency 'faraday', '>= 0.9.0'
   gem.add_development_dependency 'apparition'
   gem.add_development_dependency 'capybara'

spec/lib/proxy_spec.rb

@@ -1,4 +1,3 @@
-require 'spec_helper'
 require 'resolv'
 
 shared_examples_for 'a proxy server' do
@@ -255,7 +254,7 @@
 
         it 'should raise error when disabled' do
           # TODO: Suppress stderr output: https://gist.github.com/adamstegman/926858
-          expect { http.get('/foo') }.to raise_error(Faraday::ConnectionFailed, 'end of file reached')
+          expect { http.get('http://non-whitelisted.test') }.to raise_error(Faraday::ConnectionFailed, 'end of file reached')
         end
       end