Add simplecov

Makes it easier to figure out what is covered by specs

Gemfile.lock

@@ -15,6 +15,7 @@ GEM
     ast (2.4.2)
     concurrent-ruby (1.1.8)
     diff-lcs (1.4.4)
+    docile (1.3.5)
     factory_bot (6.1.0)
       activesupport (>= 5.0.0)
     i18n (1.8.9)
@@ -52,6 +53,12 @@ GEM
     rubocop-ast (1.4.1)
       parser (>= 2.7.1.5)
     ruby-progressbar (1.11.0)
+    simplecov (0.21.2)
+      docile (~> 1.1)
+      simplecov-html (~> 0.11)
+      simplecov_json_formatter (~> 0.1)
+    simplecov-html (0.12.3)
+    simplecov_json_formatter (0.1.2)
     tzinfo (2.0.4)
       concurrent-ruby (~> 1.0)
     unicode-display_width (2.0.0)
@@ -66,6 +73,7 @@ DEPENDENCIES
   rake (~> 12.0)
   rspec (~> 3.0)
   rubocop (~> 1.11)
+  simplecov (~> 0.21)
 
 BUNDLED WITH
    2.1.4

planet_express.gemspec

@@ -31,4 +31,5 @@ Gem::Specification.new do |spec|
 
   spec.add_development_dependency('rubocop', '~> 1.11')
   spec.add_development_dependency('factory_bot', '~> 6.1')
+  spec.add_development_dependency('simplecov', '~> 0.21')
 end

spec/spec_helper.rb

@@ -2,6 +2,8 @@
 
 require 'bundler/setup'
 require 'factory_bot'
+require 'simplecov'
+SimpleCov.start
 require 'planet_express'
 
 RSpec.configure do |config|