run_in_isolation(&blk) public

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# File activesupport/lib/active_support/testing/isolation.rb, line 102
        def run_in_isolation(&blk)
          read, write = IO.pipe

          pid = fork do
            read.close
            proxy = ProxyTestResult.new
            retval = yield proxy
            write.puts [Marshal.dump([retval, proxy])].pack("m")
            exit!
          end

          write.close
          result = read.read
          Process.wait2(pid)
          return result.unpack("m")[0]
        end
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