Run tests with latest liquid/c gem

.travis.yml

@@ -14,7 +14,7 @@ matrix:
   allow_failures:
     - rvm: jruby-head
 
-script: "rake"
+script: "bundle exec rake"
 
 notifications:
   disable: true

Gemfile

@@ -7,4 +7,8 @@ group :test do
   gem 'spy', '0.4.1'
   gem 'benchmark-ips'
   gem 'rubocop'
+
+  platform :ruby, :mswin, :mingw do
+    gem 'liquid-c', github: 'Shopify/liquid-c', ref: '35e9aee48d639ae1d3ac9ba77616aca9800eab7d'
+  end
 end

Rakefile

@@ -27,9 +27,22 @@ desc 'runs test suite with both strict and lax parsers'
 task :test do
   ENV['LIQUID_PARSER_MODE'] = 'lax'
   Rake::Task['base_test'].invoke
+
   ENV['LIQUID_PARSER_MODE'] = 'strict'
   Rake::Task['base_test'].reenable
   Rake::Task['base_test'].invoke
+
+  if RUBY_ENGINE == 'ruby'
+    ENV['LIQUID-C'] = '1'
+
+    ENV['LIQUID_PARSER_MODE'] = 'lax'
+    Rake::Task['base_test'].reenable
+    Rake::Task['base_test'].invoke
+
+    ENV['LIQUID_PARSER_MODE'] = 'strict'
+    Rake::Task['base_test'].reenable
+    Rake::Task['base_test'].invoke
+  end
 end
 
 task gem: :build

test/test_helper.rb

@@ -15,6 +15,11 @@ if env_mode = ENV['LIQUID_PARSER_MODE']
 end
 Liquid::Template.error_mode = mode
 
+if ENV['LIQUID-C'] == '1'
+  puts "-- LIQUID C"
+  require 'liquid/c'
+end
+
 if Minitest.const_defined?('Test')
   # We're on Minitest 5+. Nothing to do here.
 else