Setup test with initial test cases

.travis.yml

@@ -12,10 +12,12 @@ cache:
 
 install:
   - gem install rubocop
+  - gem install rake
   - nvm install node
   - node -v
   - npm i -g yarn
   - yarn
 script:
   - yarn lint
   - rubocop
+  - rake test

Gemfile

@@ -1,3 +1,5 @@
 source "https://rubygems.org"
 
 gemspec
+
+gem "rails"

Gemfile.lock

@@ -9,6 +9,16 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
+    actioncable (5.0.1)
+      actionpack (= 5.0.1)
+      nio4r (~> 1.2)
+      websocket-driver (~> 0.6.1)
+    actionmailer (5.0.1)
+      actionpack (= 5.0.1)
+      actionview (= 5.0.1)
+      activejob (= 5.0.1)
+      mail (~> 2.5, >= 2.5.4)
+      rails-dom-testing (~> 2.0)
     actionpack (5.0.1)
       actionview (= 5.0.1)
       activesupport (= 5.0.1)
@@ -22,26 +32,56 @@ GEM
       erubis (~> 2.7.0)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.0, >= 1.0.2)
+    activejob (5.0.1)
+      activesupport (= 5.0.1)
+      globalid (>= 0.3.6)
+    activemodel (5.0.1)
+      activesupport (= 5.0.1)
+    activerecord (5.0.1)
+      activemodel (= 5.0.1)
+      activesupport (= 5.0.1)
+      arel (~> 7.0)
     activesupport (5.0.1)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (~> 0.7)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
+    arel (7.1.4)
     builder (3.2.3)
     concurrent-ruby (1.0.5)
     erubis (2.7.0)
+    globalid (0.3.7)
+      activesupport (>= 4.1.0)
     i18n (0.8.1)
     loofah (2.0.3)
       nokogiri (>= 1.5.9)
+    mail (2.6.4)
+      mime-types (>= 1.16, < 4)
     method_source (0.8.2)
+    mime-types (3.1)
+      mime-types-data (~> 3.2015)
+    mime-types-data (3.2016.0521)
     mini_portile2 (2.1.0)
     minitest (5.10.1)
     multi_json (1.12.1)
+    nio4r (1.2.1)
     nokogiri (1.7.0.1)
       mini_portile2 (~> 2.1.0)
     rack (2.0.1)
     rack-test (0.6.3)
       rack (>= 1.0)
+    rails (5.0.1)
+      actioncable (= 5.0.1)
+      actionmailer (= 5.0.1)
+      actionpack (= 5.0.1)
+      actionview (= 5.0.1)
+      activejob (= 5.0.1)
+      activemodel (= 5.0.1)
+      activerecord (= 5.0.1)
+      activesupport (= 5.0.1)
+      bundler (>= 1.3.0, < 2.0)
+      railties (= 5.0.1)
+      sprockets-rails (>= 2.0.0)
     rails-dom-testing (2.0.2)
       activesupport (>= 4.2.0, < 6.0)
       nokogiri (~> 1.6)
@@ -54,16 +94,29 @@ GEM
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
     rake (12.0.0)
+    sprockets (3.7.1)
+      concurrent-ruby (~> 1.0)
+      rack (> 1, < 3)
+    sprockets-rails (3.2.0)
+      actionpack (>= 4.0)
+      activesupport (>= 4.0)
+      sprockets (>= 3.0.0)
     thor (0.19.4)
     thread_safe (0.3.6)
     tzinfo (1.2.2)
       thread_safe (~> 0.1)
+    websocket-driver (0.6.5)
+      websocket-extensions (>= 0.1.0)
+    websocket-extensions (0.1.2)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
   bundler (~> 1.12)
+  minitest (~> 5.0)
+  rails
+  rake (~> 12.0)
   webpacker!
 
 BUNDLED WITH

Rakefile

@@ -1 +1,12 @@
+# frozen_string_literal: true
 require "bundler/gem_tasks"
+require "rake/testtask"
+
+Rake::TestTask.new(:test) do |t|
+  t.libs << "test"
+  t.libs << "lib"
+  t.test_files = FileList["test/**/*_test.rb"]
+  t.verbose = true
+end
+
+task default: :test

test/env_test.rb

@@ -0,0 +1,16 @@
+require "webpacker_test"
+
+class EnvTest < Minitest::Test
+  def test_current_env
+    assert Webpacker::Env.current == "production"
+  end
+
+  def test_env_is_development?
+    refute Webpacker::Env.development?
+  end
+
+  def test_file_path
+    correct_path = File.join(File.dirname(__FILE__), "config", "webpack", "paths.yml").to_s
+    assert Webpacker::Env.file_path.to_s == correct_path
+  end
+end

test/webpacker_test.rb

@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+require "minitest/autorun"
+require "rails"
+require "rails/test_help"
+require "webpacker"
+
+module TestApp
+  class Application < ::Rails::Application
+    config.root = File.dirname(__FILE__)
+  end
+end
+
+TestApp::Application.initialize!

webpacker.gemspec

@@ -17,6 +17,8 @@ Gem::Specification.new do |s|
   s.add_dependency "railties",      ">= 4.2"
 
   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")