Merge pull request #16 from ryancyq/simplecov

refactor: coverage rake task

.simplecov

@@ -1,10 +1,14 @@
 # frozen_string_literal: true
 
-SimpleCov.start do
+SimpleCov.configure do
   enable_coverage :branch
   command_name "ruby-#{RUBY_VERSION}"
   coverage_dir File.join(ENV.fetch("COV_DIR", "coverage"), command_name)
 
+  at_fork do |pid|
+    command_name "#{command_name} (subprocess: #{pid})"
+  end
+
   if ENV["CI"]
     require "simplecov-cobertura"
     formatter SimpleCov::Formatter::CoberturaFormatter

.simplecov_spawn.rb

@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+
+require "simplecov"
+
+SimpleCov.at_fork.call(Process.pid)
+SimpleCov.start

tasks/coverage.rake

@@ -3,22 +3,29 @@
 namespace :coverage do
   desc "Run coverage with spec"
   task :run do
+    require "simplecov"
+    require "rake/clean"
+    # clean up previously generated report
+    Rake::Cleaner.cleanup_files([SimpleCov.coverage_dir])
+
     Rake::Task[:spec].invoke(coverage: true)
   end
 
   desc "Collates coverage results generated by different test runners"
   task :report do
-    coverage_dir = File.join(ENV.fetch("COV_DIR", "coverage"), "ruby-*")
+    require "simplecov"
+    coverage_dir = File.join(File.dirname(SimpleCov.coverage_dir), "ruby-*")
     coverage_reports = Dir[File.join(coverage_dir, ".resultset.json")]
 
     raise <<~MSG if coverage_reports.empty?
       Coverage reports not found, searched in:
-      #{Dir[coverage_dir].map { |dir| "  - #{dir}\n" }.join}
+      #{Dir[coverage_dir].map { |dir| "  - #{dir}" }.join("\n")}
     MSG
 
-    require "simplecov"
     SimpleCov.collate(coverage_reports) do
       coverage_dir "coverage"
     end
   end
 end
+
+task coverage: ["coverage:run", "coverage:report"]

tasks/rspec.rake

@@ -3,8 +3,6 @@
 require "rspec/core/rake_task"
 
 RSpec::Core::RakeTask.new(:spec, [:coverage]) do |config, args|
-  opts = []
-  opts << "--format documentation"
-  opts << "--require 'simplecov'" if args[:coverage]
-  config.rspec_opts = opts.join(" ")
+  config.ruby_opts = "-r./.simplecov_spawn" if args[:coverage]
+  config.rspec_opts = "--format documentation"
 end