Only require connection_pool running connection_pool appraisal

Appraisals

@@ -32,3 +32,8 @@ end
 appraise 'dalli2' do
   gem 'dalli', '~> 2.0'
 end
+
+appraise "connection_pool_dalli" do
+  gem "connection_pool", "~> 2.2"
+  gem "dalli", "~> 2.7"
+end

gemfiles/connection_pool_dalli.gemfile

@@ -0,0 +1,8 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "connection_pool", "~> 2.2"
+gem "dalli", "~> 2.7"
+
+gemspec path: "../"

rack-attack.gemspec

@@ -48,6 +48,5 @@ Gem::Specification.new do |s|
   # which rack-attack uses only for testing compatibility in test suite.
   s.add_development_dependency 'actionpack', '>= 3.0.0'
   s.add_development_dependency 'activesupport', '>= 3.0.0'
-  s.add_development_dependency 'connection_pool'
   s.add_development_dependency 'redis-activesupport'
 end

spec/acceptance/stores/active_support_redis_cache_store_pooled_spec.rb

@@ -1,6 +1,7 @@
 require_relative "../../spec_helper"
-require_relative "../../support/cache_store_helper"
 
+if defined?(::ConnectionPool)
+  require_relative "../../support/cache_store_helper"
   require "timecop"
 
   if ActiveSupport.version >= Gem::Version.new("5.2.0")
@@ -38,3 +39,4 @@ if ActiveSupport.version >= Gem::Version.new("5.2.0")
       end
     end
   end
+end

spec/acceptance/stores/connection_pool_dalli_client_spec.rb

@@ -1,6 +1,6 @@
 require_relative "../../spec_helper"
 
-if defined?(::Dalli)
+if defined?(::Dalli) && defined?(::ConnectionPool)
   require_relative "../../support/cache_store_helper"
   require "connection_pool"
   require "dalli"

spec/spec_helper.rb

@@ -18,6 +18,11 @@ begin
 rescue LoadError
 end
 
+begin
+  require "connection_pool"
+rescue LoadError
+end
+
 class MiniTest::Spec
   include Rack::Test::Methods