Adding coverage support when COVERAGE is enabled (#385)

Signed-off-by: Pedro Tanaka <[email protected]>

.gitignore

@@ -6,3 +6,4 @@ Gemfile.lock
 pkg/*
 vendor/
 tmp/*
+coverage/*

Gemfile

@@ -12,6 +12,7 @@ gem "rubocop", ">= 1.0"
 gem "rubocop-shopify", require: false
 gem "benchmark-ips"
 gem "dogstatsd-ruby", "~> 5.0", require: false
+gem "simplecov", require: false, group: :test
 platform :mri do
   # only if Ruby is MRI && >= 3.2
   if Gem::Version.new(RUBY_VERSION) >= Gem::Version.new("3.2")

test/test_helper.rb

@@ -6,6 +6,11 @@
 
 ENV["ENV"] = "test"
 
+if ENV["COVERAGE"]
+  require "simplecov"
+  SimpleCov.start
+end
+# Previous content of test helper now starts here
 unless ENV.key?("CI")
   require "minitest/pride"
 end