added support for minitest run in parallel

Gemfile

@@ -16,7 +16,8 @@ gem "certificate_authority", git: "https://github.com/cchandler/certificate_auth
                              branch: "master",
                              require: false
 
-gem "simplecov", ">= 0.9"
+gem "simplecov"
 
-gem "minitest"
-gem "rubocop"
+gem "minitest", require: false
+gem "minitest-proveit", require: false
+gem "rubocop", require: false

test/test_helper.rb

@@ -3,6 +3,13 @@
 gem "minitest"
 require "minitest/autorun"
 
+if ENV.key?("PARALLEL")
+  require "minitest/hell"
+  class Minitest::Test
+    parallelize_me!
+  end
+end
+
 $HTTPX_DEBUG = !!ENV["HTTPX_DEBUG"]
 
 require "httpx"