Explicitly add autotest to Gemfile

Gemfile

@@ -61,6 +61,7 @@ end
 
 group :test do
   gem 'rails-controller-testing'
+  gem 'autotest' # required by autotest-rails
   gem 'autotest-rails'
   gem 'capybara'
   gem 'selenium-webdriver'

Gemfile.lock

@@ -59,6 +59,8 @@ GEM
     amq-protocol (2.3.0)
     arel (9.0.0)
     ast (2.4.0)
+    autotest (5.0.0)
+      minitest-autotest (~> 1.0)
     autotest-rails (4.2.1)
       ZenTest (~> 4.5)
     bcrypt (3.1.13)
@@ -187,6 +189,11 @@ GEM
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
     minitest (5.12.2)
+    minitest-autotest (1.1.1)
+      minitest-server (~> 1.0)
+      path_expander (~> 1.0)
+    minitest-server (1.0.5)
+      minitest (~> 5.0)
     mnemosyne-ruby (1.7.1)
       activesupport (>= 4)
       bunny
@@ -216,6 +223,7 @@ GEM
     parallel (1.18.0)
     parser (2.6.5.0)
       ast (~> 2.4.0)
+    path_expander (1.1.0)
     pg (1.1.4)
     polyamorous (2.3.0)
       activerecord (>= 5.0)
@@ -406,6 +414,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
+  autotest
   autotest-rails
   bcrypt
   better_errors