Add test coverage reporting to Coveralls

Author: epologee

Gemfile

@@ -2,10 +2,13 @@ source "https://rubygems.org"
 
 gemspec
 
+gem "coveralls_reborn", require: false
 gem "factory_bot"
 gem "rake", "~> 13.0"
 gem "rspec", "~> 3.0"
 gem "rubocop"
 gem "rubocop-factory_bot"
 gem "rubocop-rake"
 gem "rubocop-rspec"
+gem "simplecov", require: false
+gem "simplecov-lcov", require: false

README.md

@@ -1,8 +1,9 @@
 # S2 Ruby
 
-[![Tests](https://github.com/stekker/s2-ruby/actions/workflows/ci.yml/badge.svg)](https://github.com/stekker/s2-ruby/actions/workflows/ci.yml)
 [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](LICENSE.txt)
 [![Ruby](https://img.shields.io/badge/Ruby-3.3+-red.svg)](s2-ruby.gemspec)
+[![Tests](https://github.com/stekker/s2-ruby/actions/workflows/ci.yml/badge.svg)](https://github.com/stekker/s2-ruby/actions/workflows/ci.yml)
+[![Coverage Status](https://coveralls.io/repos/github/stekker/s2-ruby/badge.svg?branch=main)](https://coveralls.io/github/stekker/s2-ruby?branch=main)
 
 Ruby implementation of the [S2 standard](https://s2standard.org/) (EN 50491-12-2) for smart grid energy flexibility.
 

spec/spec_helper.rb

@@ -1,3 +1,26 @@
+require "simplecov"
+require "simplecov-lcov"
+
+SimpleCov::Formatter::LcovFormatter.config do |config|
+  config.report_with_single_file = true
+  config.single_report_path = "coverage/lcov.info"
+end
+
+SimpleCov.formatter = SimpleCov::Formatter::MultiFormatter.new(
+  [
+    SimpleCov::Formatter::HTMLFormatter,
+    SimpleCov::Formatter::LcovFormatter,
+  ],
+)
+
+SimpleCov.start do
+  add_filter "/spec/"
+  enable_coverage :branch
+end
+
+require "coveralls"
+Coveralls.wear! if ENV["CI"]
+
 require "rspec"
 require "factory_bot"
 require "s2"