Check missing deps

Rakefile

@@ -56,13 +56,13 @@ namespace :test do
       end
 
       candidates.each do |appraisal_group, _|
-        command = if appraisal_group.empty?
-                    "bundle exec rake #{spec_task}"
-                  else
-                    gemfile = File.join(File.dirname(__FILE__), 'gemfiles', "#{ruby_runtime}-#{appraisal_group}.gemfile".tr('-', '_'))
-                    "env BUNDLE_GEMFILE=#{gemfile} bundle exec rake #{spec_task}"
-                  end
-
+        env = if appraisal_group.empty?
+          {}
+        else
+          gemfile = File.join(File.dirname(__FILE__), 'gemfiles', "#{ruby_runtime}-#{appraisal_group}.gemfile".tr('-', '_'))
+          { 'BUNDLE_GEMFILE' => gemfile }
+        end
+        command = "bundle check || bundle install && bundle exec rake #{spec_task}"
         command += "'[#{spec_arguments}]'" if spec_arguments
 
         total_executors = ENV.key?('CIRCLE_NODE_TOTAL') ? ENV['CIRCLE_NODE_TOTAL'].to_i : nil
@@ -71,9 +71,9 @@ namespace :test do
         if total_executors && current_executor && total_executors > 1
           @execution_count ||= 0
           @execution_count += 1
-          sh(command) if @execution_count % total_executors == current_executor
+          Bundler.with_unbundled_env { sh(env, command) } if @execution_count % total_executors == current_executor
         else
-          sh(command)
+          Bundler.with_unbundled_env { sh(env, command) }
         end
       end
     end