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The test demonstrates failure for the following scenario. A single-subscription client calls unsubscribe immediately followed by a subscribe. It will fail when it tries to receive the next pmessage/message because the client will be in false pub_sub_mode. Here is why it is false: First, the 2nd subscribe sets pub_sub_mode to true during send_command. Next, the unsubscribe's return_reply sets pub_sub_mode to false. The 2nd subscribe's return_reply does not re-set pub_sub_mode back to true. So the result is a client with false pub_sub_mode that fails upon receipt of the next message or pmessage.