Add logger as development dependency.

Author: fnando

browser.gemspec

@@ -31,6 +31,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency "rack-test"
   s.add_development_dependency "rails"
   s.add_development_dependency "rake"
+  s.add_development_dependency "logger"
   s.add_development_dependency "rubocop"
   s.add_development_dependency "rubocop-fnando"
   s.add_development_dependency "simplecov"

test/test_helper.rb

@@ -7,6 +7,7 @@
 
 ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../Gemfile", __dir__)
 require "bundler/setup"
+require "logger"
 require "minitest/autorun"
 require "minitest/utils"
 require "browser"