Add simplecov for coverage reports

.gitignore

@@ -9,3 +9,6 @@
 
 # rspec failure tracking
 .rspec_status
+
+# Ignore coverage reports
+coverage/

Gemfile

@@ -12,3 +12,5 @@ gem "rspec", "~> 3.0"
 gem "standard", "~> 1.3"
 
 gem "factory_bot", "~> 6.3"
+
+gem "simplecov", "~> 0.22.0", require: false

Gemfile.lock

@@ -23,6 +23,7 @@ GEM
     concurrent-ruby (1.2.2)
     connection_pool (2.4.1)
     diff-lcs (1.5.0)
+    docile (1.4.0)
     drb (2.1.1)
       ruby2_keywords
     factory_bot (6.3.0)
@@ -76,6 +77,12 @@ GEM
       rubocop-ast (>= 0.4.0)
     ruby-progressbar (1.13.0)
     ruby2_keywords (0.0.5)
+    simplecov (0.22.0)
+      docile (~> 1.1)
+      simplecov-html (~> 0.11)
+      simplecov_json_formatter (~> 0.1)
+    simplecov-html (0.12.3)
+    simplecov_json_formatter (0.1.4)
     standard (1.31.2)
       language_server-protocol (~> 3.17.0.2)
       lint_roller (~> 1.0)
@@ -100,6 +107,7 @@ DEPENDENCIES
   rake (~> 13.0)
   rex!
   rspec (~> 3.0)
+  simplecov (~> 0.22.0)
   standard (~> 1.3)
 
 BUNDLED WITH

spec/spec_helper.rb

@@ -1,7 +1,10 @@
 # frozen_string_literal: true
 
+require "simplecov"
+
+SimpleCov.start
 require "rex"
-require 'factory_bot'
+
 Dir[
   File.join(
     File.expand_path("../support", __FILE__),