Gemfile in instana-0.8.6 vs Gemfile in instana-0.9.0.pre.slywolf3

@@ -3,10 +3,18 @@
 group :development, :test do
   gem 'rake'
   gem 'minitest'
   gem 'minitest-reporters'
   gem 'minitest-debugger', :require => false
+  gem 'rack-test'
   gem 'webmock'
+
+  gem "puma"
+
+  # Rack v2 dropped support for Ruby 2.2 and higher.
+  if RUBY_VERSION < '2.2'
+    gem 'rack', '< 2.0'
+  end
 end
 
 group :development do
   gem 'ruby-debug',   :platforms => [:mri_18, :jruby]
   gem 'debugger',     :platform  =>  :mri_19