Add coverage tools

test/coverage_setup.rb

@@ -0,0 +1,12 @@
+require 'simplecov'
+require 'coveralls'
+
+SimpleCov.formatter = SimpleCov::Formatter::MultiFormatter[
+  SimpleCov::Formatter::HTMLFormatter,
+  Coveralls::SimpleCov::Formatter
+]
+
+SimpleCov.start do
+  add_group "lib", "lib"
+  add_group "test", "test"
+end

test/test_helper.rb

@@ -1,4 +1,5 @@
 require 'bundler/setup'
+require 'coverage_setup'
 require 'test/unit'
 require 'active_model_serializers'
 require 'fixtures/poro'