Exit 0 when queue is exhausted after lazy-load boot

ruby/Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    ci-queue (0.85.0)
+    ci-queue (0.86.0)
       logger
 
 GEM

ruby/lib/ci/queue/version.rb

@@ -2,7 +2,7 @@
 
 module CI
   module Queue
-    VERSION = '0.85.0'
+    VERSION = '0.86.0'
     DEV_SCRIPTS_ROOT = ::File.expand_path('../../../../../redis', __FILE__)
     RELEASE_SCRIPTS_ROOT = ::File.expand_path('../redis', __FILE__)
   end

ruby/lib/minitest/queue/runner.rb

@@ -118,6 +118,15 @@ def run_command
           # minitest/autorun's at_exit hook, which may not be registered since
           # test files haven't been loaded yet. exit! prevents double-execution
           # if minitest/autorun was loaded by the leader during streaming.
+          #
+          # Re-check exhausted? after booting: slow workers may arrive after the queue
+          # has been fully drained by faster workers. In that case exit cleanly (0)
+          # rather than letting Minitest return false for a 0-test run.
+          if queue.rescue_connection_errors { queue.exhausted? }
+            puts green('All tests were ran already')
+            verify_reporters!(reporters)
+            exit!(0)
+          end
           passed = Minitest.run []
           verify_reporters!(reporters)
           exit!(passed ? 0 : 1)