ci: upload coverage to Codecov

Author: nficano

.github/workflows/test.yml

@@ -61,6 +61,18 @@ jobs:
       - name: RSpec
         run: bundle exec rake spec
 
+      # SimpleCov emits coverage/lcov.info for Codecov. Upload from the latest
+      # Ruby matrix entry only; coverage should not differ by patch runtime.
+      - name: Upload coverage to Codecov
+        if: matrix.ruby == '3.5'
+        # codecov/codecov-action v6.0.1
+        uses: codecov/codecov-action@e79a6962e0d4c0c17b229090214935d2e33f8354 # v6.0.1
+        with:
+          fail_ci_if_error: false
+          flags: unittests
+          files: ./coverage/lcov.info
+          token: ${{ secrets.CODECOV_TOKEN }}
+
       - name: Upload test artifacts
         if: failure()
         # actions/upload-artifact v4.4.3

Gemfile

@@ -16,6 +16,7 @@ group :development, :test do
   gem 'rubocop-rake', require: false
   gem 'rubocop-rspec', require: false
   gem 'simplecov', '~> 0.22', require: false
+  gem 'simplecov-lcov', '~> 0.8', require: false
   gem 'steep', '~> 2.0', require: false
   gem 'yard', '~> 0.9', require: false
 end

Gemfile.lock

@@ -167,6 +167,7 @@ GEM
       simplecov-html (~> 0.11)
       simplecov_json_formatter (~> 0.1)
     simplecov-html (0.13.2)
+    simplecov-lcov (0.9.0)
     simplecov_json_formatter (0.1.4)
     sqlite3 (2.9.4)
       mini_portile2 (~> 2.8.0)
@@ -234,6 +235,7 @@ DEPENDENCIES
   rubocop-rake
   rubocop-rspec
   simplecov (~> 0.22)
+  simplecov-lcov (~> 0.8)
   steep (~> 2.0)
   yard (~> 0.9)
 

README.md

@@ -5,6 +5,7 @@
 <p align="center">
   <a href="https://rubygems.org/gems/arcp"><img alt="gem" src="https://img.shields.io/gem/v/arcp.svg"></a>
   <a href="https://github.com/agentruntimecontrolprotocol/ruby-sdk/actions/workflows/test.yml"><img alt="CI" src="https://github.com/agentruntimecontrolprotocol/ruby-sdk/actions/workflows/test.yml/badge.svg"></a>
+  <a href="https://codecov.io/gh/agentruntimecontrolprotocol/ruby-sdk"><img alt="codecov" src="https://codecov.io/gh/agentruntimecontrolprotocol/ruby-sdk/graph/badge.svg"></a>
   <a href="https://github.com/agentruntimecontrolprotocol/spec/blob/main/docs/draft-arcp-1.1.md"><img alt="ARCP" src="https://img.shields.io/badge/ARCP-v1.1%20draft-blue"></a>
   <a href="LICENSE"><img alt="License" src="https://img.shields.io/badge/license-Apache--2.0-lightgrey"></a>
   <a href="https://coderabbit.ai"><img alt="CodeRabbit" src="https://img.shields.io/coderabbit/prs/github/agentruntimecontrolprotocol/ruby-sdk?utm_source=oss&utm_medium=github&utm_campaign=agentruntimecontrolprotocol/ruby-sdk&labelColor=171717&color=FF570A&label=CodeRabbit+Reviews"></a>

spec/spec_helper.rb

@@ -1,6 +1,15 @@
 # frozen_string_literal: true
 
 require 'simplecov'
+require 'simplecov-lcov'
+
+SimpleCov::Formatter::LcovFormatter.config.report_with_single_file = true
+SimpleCov::Formatter::LcovFormatter.config.single_report_path = 'coverage/lcov.info'
+SimpleCov.formatters = [
+  SimpleCov::Formatter::HTMLFormatter,
+  SimpleCov::Formatter::LcovFormatter
+]
+
 SimpleCov.start do
   enable_coverage :branch
   add_filter '/spec/'