🔧 Readd checking code coverage with Coveralls

.coveralls.yml

@@ -0,0 +1 @@
+service_name: github-ci

.github/workflows/coverage.yml

@@ -0,0 +1,28 @@
+name: coverage
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  coverage:
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install BLAS and LAPACK
+        run: sudo apt-get install -y libopenblas-dev liblapacke-dev
+      - name: Set up Ruby 2.7
+        uses: actions/setup-ruby@v1
+        with:
+          ruby-version: '2.7'
+      - name: Build and test with Rake
+        run: |
+          gem install bundler
+          bundle install
+          bundle exec rake
+      - name: Coveralls GitHub Action
+        uses: coverallsapp/github-action@v1.1.2
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}

Gemfile

@@ -13,4 +13,5 @@ gem 'rubocop', '~> 1.0'
 gem 'rubocop-performance', '~> 1.8'
 gem 'rubocop-rake', '~> 0.5'
 gem 'rubocop-rspec', '~> 2.0'
-gem 'simplecov', '~> 0.19'
+gem 'simplecov', '~> 0.21'
+gem 'simplecov-lcov', '~> 0.8'

spec/spec_helper.rb

@@ -1,9 +1,17 @@
 # frozen_string_literal: true
 
-require 'pp'
 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.formatter = SimpleCov::Formatter::MultiFormatter.new([SimpleCov::Formatter::HTMLFormatter])
 SimpleCov.start
 
 require 'bundler/setup'