Merge pull request #186 from Shopify/set-minitest-seed-expclitly-for-v0.15.6

Set seed via new cattr_accessor 'Minitest#seed' explicitly

Author: casperisfine

.spin/svc.yml

@@ -0,0 +1 @@
+- redis

ruby/lib/minitest/queue/runner.rb

@@ -22,6 +22,9 @@ def self.invoke(argv)
       def initialize(argv)
         @queue_config = CI::Queue::Configuration.from_env(ENV)
         @command, @argv = parse(argv)
+        if Minitest.respond_to?(:seed=)
+          Minitest.seed = @queue_config.seed.to_i
+        end
       end
 
       def run!