wait for child proces to die before re-acquiring resource

Author: Charlie Somerville

test/resource_test.rb

@@ -117,10 +117,9 @@ def test_acquire_releases_on_kill
       end
 
       Process.kill("KILL", pid)
+      Process.waitpid(pid)
       resource.acquire { acquired = true }
       assert acquired
-
-      Process.wait
     ensure
       FileUtils.rm_f(path) if path
     end