Switch code coverage tool

Using SimpleCov directly and telling Coveralls after the fact, rather
than using COveralls directly.

.github/workflows/ci.yml

@@ -21,3 +21,20 @@ jobs:
           bundler-cache: true # runs 'bundle install' and caches installed gems automatically
       - name: Run Tests
         run: bundle exec rake spec
+      - name: Push code coverage to Coveralls
+        uses: coverallsapp/github-action@master
+        with:
+          github-token: ${{ secrets.github_token }}
+          path-to-lcov: "./coverage/lcov/lcov.info"
+          parallel: true
+          flag-name: run-${{ matrix.os }}-${{ matrix.ruby-version }}
+
+  test_finish:
+    needs: test
+    runs-on: ubuntu-latest
+    steps:
+      - name: Coveralls Finished
+        uses: coverallsapp/github-action@master
+        with:
+          github-token: ${{ secrets.github_token }}
+          parallel-finished: true

.simplecov

@@ -0,0 +1,15 @@
+require 'simplecov-lcov'
+
+
+SimpleCov::Formatter::LcovFormatter.config do |config|
+  config.report_with_single_file = true
+  config.lcov_file_name = 'lcov.info'
+end
+
+SimpleCov.formatter = SimpleCov::Formatter::MultiFormatter.new([SimpleCov::Formatter::HTMLFormatter,
+                                                                SimpleCov::Formatter::LcovFormatter])
+
+SimpleCov.start do
+  root __dir__
+  merge_timeout 300
+end

childprocess.gemspec

@@ -22,5 +22,6 @@ Gem::Specification.new do |s|
 
   s.add_development_dependency "rspec", "~> 3.0"
   s.add_development_dependency "yard", "~> 0.0"
-  s.add_development_dependency 'coveralls', '< 1.0'
+  s.add_development_dependency 'simplecov', '< 1.0'
+  s.add_development_dependency 'simplecov-lcov', '< 1.0'
 end

spec/spec_helper.rb

@@ -1,10 +1,7 @@
 $LOAD_PATH.unshift(File.dirname(__FILE__))
 $LOAD_PATH.unshift(File.join(File.dirname(__FILE__), '..', 'lib'))
 
-unless defined?(JRUBY_VERSION)
-  require 'coveralls'
-  Coveralls.wear!
-end
+require 'simplecov'
 
 require 'childprocess'
 require 'rspec'