add coveralls

Gemfile

@@ -5,3 +5,7 @@ source 'https://rubygems.org'
 git_source(:github) { |repo_name| "https://github.com/#{repo_name}" }
 
 gemspec
+
+group :test do
+  gem 'coveralls', require: false
+end

Gemfile.lock

@@ -9,7 +9,15 @@ GEM
     ast (2.4.1)
     byebug (11.1.3)
     coderay (1.1.3)
+    coveralls (0.8.23)
+      json (>= 1.8, < 3)
+      simplecov (~> 0.16.1)
+      term-ansicolor (~> 1.3)
+      thor (>= 0.19.4, < 2.0)
+      tins (~> 1.6)
     diff-lcs (1.4.2)
+    docile (1.3.2)
+    json (2.3.1)
     method_source (1.0.0)
     parallel (1.19.2)
     parser (2.7.1.4)
@@ -51,13 +59,25 @@ GEM
     rubocop-rspec (1.40.0)
       rubocop (>= 0.68.1)
     ruby-progressbar (1.10.1)
+    simplecov (0.16.1)
+      docile (~> 1.1)
+      json (>= 1.8, < 3)
+      simplecov-html (~> 0.10.0)
+    simplecov-html (0.10.2)
+    sync (0.5.0)
+    term-ansicolor (1.7.1)
+      tins (~> 1.0)
+    thor (1.0.1)
+    tins (1.25.0)
+      sync
     unicode-display_width (1.7.0)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
   bundler (~> 1.17)
+  coveralls
   i18n_def_scanner!
   pry-byebug (~> 3.9.0)
   rake (~> 10.0)

spec/spec_helper.rb

@@ -3,6 +3,9 @@
 require 'bundler/setup'
 require 'i18n_def_scanner'
 
+require 'coveralls'
+Coveralls.wear!
+
 RSpec.configure do |config|
   config.example_status_persistence_file_path = '.rspec_status'
   config.disable_monkey_patching!