diff --git a/Gemfile.lock b/Gemfile.lock
index c15d1394c..0f18eb138 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -64,6 +64,8 @@ PLATFORMS
 
 DEPENDENCIES
   bundler (~> 1.12)
+  minitest (~> 5.0)
+  rake (~> 12.0)
   webpacker!
 
 BUNDLED WITH
diff --git a/Rakefile b/Rakefile
index 29955274e..a1255fed6 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1 +1,10 @@
 require "bundler/gem_tasks"
+
+require 'rake/testtask'
+Rake::TestTask.new do |t|
+  t.libs << 'test'
+  t.libs << 'lib'
+  t.test_files = FileList['test/**/*_test.rb']
+end
+
+task default: :test
diff --git a/lib/webpacker/version.rb b/lib/webpacker/version.rb
new file mode 100644
index 000000000..5a8845a1c
--- /dev/null
+++ b/lib/webpacker/version.rb
@@ -0,0 +1,3 @@
+module Webpacker
+  VERSION = '0.1'
+end
diff --git a/test/test_helper.rb b/test/test_helper.rb
new file mode 100644
index 000000000..2bf393371
--- /dev/null
+++ b/test/test_helper.rb
@@ -0,0 +1,4 @@
+$LOAD_PATH.unshift File.expand_path('../../lib', __FILE__)
+require 'webpacker'
+
+require 'minitest/autorun'
diff --git a/test/webpacker_test.rb b/test/webpacker_test.rb
new file mode 100644
index 000000000..416242cb4
--- /dev/null
+++ b/test/webpacker_test.rb
@@ -0,0 +1,7 @@
+require 'test_helper'
+
+class WebpackerTest < MiniTest::Test
+  def test_version
+    refute_nil Webpacker::VERSION
+  end
+end
diff --git a/webpacker.gemspec b/webpacker.gemspec
index 6747db982..132d8beea 100644
--- a/webpacker.gemspec
+++ b/webpacker.gemspec
@@ -1,6 +1,10 @@
+lib = File.expand_path('../lib', __FILE__)
+$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
+require 'webpacker/version'
+
 Gem::Specification.new do |s|
   s.name     = 'webpacker'
-  s.version  = '0.1'
+  s.version  = Webpacker::VERSION
   s.authors  = 'David Heinemeier Hansson'
   s.email    = 'david@basecamp.com'
   s.summary  = 'Use Webpack to manage app-like JavaScript modules in Rails'
@@ -14,6 +18,8 @@ Gem::Specification.new do |s|
   s.add_dependency 'railties',      '~> 5'
 
   s.add_development_dependency 'bundler', '~> 1.12'
+  s.add_development_dependency 'minitest', '~> 5.0'
+  s.add_development_dependency 'rake', '~> 12.0'
 
   s.files         = `git ls-files`.split("\n")
   s.test_files    = `git ls-files -- test/*`.split("\n")