Add Travis CI tests

.gitignore

@@ -0,0 +1,2 @@
+.bundle
+Gemfile.lock

.travis.yml

@@ -0,0 +1,19 @@
+language: ruby
+
+sudo: false
+
+before_install:
+  - gem install bundler
+
+rvm:
+  - 2.0.0
+  - 2.1.10
+  - 2.2.7
+  - 2.3.4
+  - 2.4.1
+  - ruby-head
+
+matrix:
+  allow_failures:
+    - rvm: ruby-head
+  fast_finish: true

Gemfile

@@ -0,0 +1,3 @@
+source "https://rubygems.org"
+
+gemspec

ejs.gemspec

@@ -7,6 +7,8 @@ Gem::Specification.new do |s|
   s.files = Dir["README.md", "LICENSE", "lib/**/*.rb"]
 
   s.add_development_dependency "execjs", "~> 0.4"
+  s.add_development_dependency "rake", "~> 12.0.0"
+  s.add_development_dependency "test-unit", "~> 3.2.3"
 
   s.authors = ["Sam Stephenson"]
   s.email = ["sstephenson@gmail.com"]