diff --git a/.gitignore b/.gitignore
index 804eafeb..f69b35b0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,4 @@ Gemfile.lock
 pkg/*
 vendor/
 tmp/*
+coverage/*
diff --git a/Gemfile b/Gemfile
index 76d76e3c..9b57bf18 100644
--- a/Gemfile
+++ b/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")
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 904b98ad..86872905 100644
--- a/test/test_helper.rb
+++ b/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