Update dotenv.

dotenv-2.2.1 no longer loads .env.local in the test environment. Load it
manually for backwards compatibility.

Gemfile.lock

@@ -116,10 +116,10 @@ GEM
     docile (1.1.5)
     domain_name (0.5.20170404)
       unf (>= 0.0.5, < 1.0.0)
-    dotenv (2.1.2)
-    dotenv-rails (2.1.2)
-      dotenv (= 2.1.2)
-      railties (>= 3.2, < 5.1)
+    dotenv (2.2.1)
+    dotenv-rails (2.2.1)
+      dotenv (= 2.2.1)
+      railties (>= 3.2, < 5.2)
     equalizer (0.0.11)
     erubis (2.7.0)
     execjs (2.7.0)

test/test_helper.rb

@@ -16,6 +16,8 @@ require 'webmock/minitest'
 Dir[File.expand_path(File.dirname(__FILE__) + "/factories/*.rb")].each {|file| require file}
 Dir[File.expand_path(File.dirname(__FILE__) + "/test_helpers/*.rb")].each {|file| require file}
 
+Dotenv.load(Rails.root + ".env.local")
+
 Shoulda::Matchers.configure do |config|
   config.integrate do |with|
     with.library :rails