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-rw-r--r--test/server_helper.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/test/server_helper.rb b/test/server_helper.rb
index 2f9266a..d4b8f98 100644
--- a/test/server_helper.rb
+++ b/test/server_helper.rb
@@ -16,6 +16,7 @@ module ServerHelper
   end
 
   def poke_until_dead(pid)
+    assert_operator pid, :>, 0
     Timeout.timeout(10) do
       begin
         Process.kill(0, pid)