2 files changed, 6 insertions, 0 deletions
diff --git a/Gemfile b/Gemfile
index 71fac47..51ff10a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,3 +5,5 @@ source 'https://rubygems.org'
 gemspec :name => 'json'
 gemspec :name => 'json_pure'
 gemspec :name => 'json-java'
+
+gem 'simplecov'
diff --git a/tests/test_helper.rb b/tests/test_helper.rb
index 752f5f5..9d3665d 100644
--- a/tests/test_helper.rb
+++ b/tests/test_helper.rb
@@ -17,3 +17,7 @@ begin
   require 'byebug'
 rescue LoadError
 end
+if ENV['START_SIMPLECOV'].to_i == 1
+  require 'simplecov'
+  SimpleCov.start
+end