Disable coverage collection in ruby/ruby repository

Skip SimpleCov setup when running inside the ruby/ruby repository to
avoid interference. Detection uses GEM_COMMAND env var for rubygems
and bundler.gemspec presence for bundler.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: hsbt

Rakefile

@@ -68,8 +68,10 @@ Rake::TestTask.new do |t|
   t.ruby_opts = %w[-w]
   t.ruby_opts << "-rdevkit" if RbConfig::CONFIG["host_os"].include?("mingw")
 
-  coverage_setup = File.expand_path("test/rubygems/coverage_setup.rb", __dir__)
-  t.ruby_opts.unshift("--disable-gems", "-r#{coverage_setup}")
+  unless ENV["GEM_COMMAND"]
+    coverage_setup = File.expand_path("test/rubygems/coverage_setup.rb", __dir__)
+    t.ruby_opts.unshift("--disable-gems", "-r#{coverage_setup}")
+  end
 
   t.libs << "test"
   t.test_files = FileList["test/**/test_*.rb"]

bundler/spec/spec_helper.rb

@@ -41,6 +41,8 @@
 require_relative "support/windows_tag_group"
 
 begin
+  raise LoadError if File.exist?(File.expand_path("../../../lib/bundler/bundler.gemspec", __dir__))
+
   gem "simplecov_json_formatter"
   require "simplecov"
 

test/rubygems/helper.rb

@@ -10,6 +10,8 @@
 require "test/unit"
 
 begin
+  raise LoadError if ENV["GEM_COMMAND"]
+
   gem "simplecov_json_formatter"
   require "simplecov"