Use webdrivers gem to keep chromedriver and geckodriver up to date

.travis.yml

@@ -23,6 +23,11 @@ addons:
       - google-chrome-beta
       - awesome
 
+cache:
+  bundler: true
+  directories:
+    - ~/.webdrivers
+
 matrix:
   include:
     - gemfile: gemfiles/Gemfile.rspec-34
@@ -62,14 +67,6 @@ matrix:
     - gemfile: gemfiles/Gemfile.edge-marionette
     - rvm: rbx-3
 before_install:
-  - mkdir -p ~/drivers; export PATH=~/drivers:$PATH;
-  - CHROMEDRIVER_VERSION=$(wget -q -O - http://chromedriver.storage.googleapis.com/LATEST_RELEASE);
-    CHROMEDRIVER_URL="http://chromedriver.storage.googleapis.com/$CHROMEDRIVER_VERSION/chromedriver_linux64.zip";
-    FILE=`mktemp`; wget "$CHROMEDRIVER_URL" -qO $FILE && unzip $FILE chromedriver -d ~/drivers; rm $FILE; chmod 777 ~/drivers/chromedriver;
-    ~/drivers/chromedriver --version;
-  - GECKODRIVER_URL="https://github.com/mozilla/geckodriver/releases/download/v0.19.1/geckodriver-v0.19.1-linux64.tar.gz";
-    FILE=`mktemp`; wget "$GECKODRIVER_URL" -qO $FILE && tar xz -C ~/drivers -f $FILE geckodriver; rm $FILE; chmod 777 ~/drivers/geckodriver;
-    ~/drivers/geckodriver --version;
   - if [[ $BUNDLE_GEMFILE =~ Gemfile.edge-marionette$ ]]; then
       pushd ..;
       git clone --depth 1 https://github.com/SeleniumHQ/selenium.git;

capybara.gemspec

@@ -28,6 +28,7 @@ Gem::Specification.new do |s|
   s.add_runtime_dependency("addressable")
 
   s.add_development_dependency("selenium-webdriver", [">= 3.0", "< 4.0", "!=3.4.1"])
+  s.add_development_dependency("webdrivers") if ENV['TRAVIS']
   s.add_development_dependency("sinatra", [">= 1.4.0"])
   s.add_development_dependency("rspec", [">= 3.4.0"])
   s.add_development_dependency("launchy", [">= 2.0.4"])

spec/spec_helper.rb

@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 require 'rspec/expectations'
 require "capybara/spec/spec_helper"
+require 'webdrivers' if ENV['TRAVIS']
 
 RSpec.configure do |config|
   Capybara::SpecHelper.configure(config)