Adds undercover gem to the stack

Gemfile

@@ -173,6 +173,7 @@ group :test do
   gem 'pdf-reader'
   gem 'rails-controller-testing'
   gem 'simplecov', require: false
+  gem 'undercover', require: false
   gem 'vcr', require: false
   gem 'webmock', require: false
   # See spec/spec_helper.rb for instructions

Gemfile.lock

@@ -356,6 +356,8 @@ GEM
     image_processing (1.12.2)
       mini_magick (>= 4.9.5, < 5)
       ruby-vips (>= 2.0.17, < 3)
+    imagen (0.1.8)
+      parser (>= 2.5, != 2.5.1.1)
     immigrant (0.3.6)
       activerecord (>= 3.0)
     invisible_captcha (2.2.0)
@@ -705,6 +707,7 @@ GEM
     rubyzip (2.3.2)
     rufus-scheduler (3.8.2)
       fugit (~> 1.1, >= 1.1.6)
+    rugged (1.7.2)
     sanitize (6.1.0)
       crass (~> 1.0.2)
       nokogiri (>= 1.12.0)
@@ -789,6 +792,11 @@ GEM
       railties (>= 6.0.0)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
+    undercover (0.5.0)
+      bigdecimal
+      imagen (>= 0.1.8)
+      rainbow (>= 2.1, < 4.0)
+      rugged (>= 0.27, < 1.8)
     unicode-display_width (2.5.0)
     uniform_notifier (1.16.0)
     uri (0.13.0)
@@ -976,6 +984,7 @@ DEPENDENCIES
   stripe
   timecop
   turbo-rails
+  undercover
   valid_email2
   validates_lengths_from_database
   vcr