diff --git a/gemfiles/common.gemfile b/gemfiles/common.gemfile
index a3459c465..7941b1b15 100644
--- a/gemfiles/common.gemfile
+++ b/gemfiles/common.gemfile
@@ -6,6 +6,7 @@ gemspec path: File.dirname(__dir__)
 
 group :development do
   gem "htmlbeautifier"
+  gem "puma"
   gem "rubocop-performance", require: false
   gem "rubocop-rails", require: false
   gem "webpacker"
@@ -18,6 +19,11 @@ group :test do
   gem "sqlite3"
 end
 
+group :development, :test do
+  gem "debug"
+  gem "pry-byebug"
+end
+
 group :ci do
   gem "danger"
 end
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 8cbd3c2f9..3cec62630 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -71,7 +71,7 @@ def assert_equivalent_xml(expected, actual)
       Diffy::Diff.new(
         sort_attributes(expected_xml.root).to_xml(indent: 2),
         sort_attributes(actual_xml.root).to_xml(indent: 2)
-      ).to_s(:color)
+      ).to_fs(:color)
     }
   end