Even simpler and even more correct.

Simon MacMullen · Simon MacMullen · commit 41a9ddd7a4d6 · 2011-05-26T14:19:20.000+01:00
diff --git a/test/src/com/rabbitmq/client/test/functional/TransactionsBase.java b/test/src/com/rabbitmq/client/test/functional/TransactionsBase.java
@@ -233,8 +233,7 @@ public void testUnknownTagAck()
         // "On a transacted channel, this check MUST be done immediately and
         // not delayed until a Tx.Commit."
         expectError(AMQP.PRECONDITION_FAILED);
-        connection = null;
-        openConnection();
+        openChannel();
     }
 
     /*

Original file line number	Diff line number	Diff line change
`@@ -233,8 +233,7 @@ public void testUnknownTagAck()`
`233`	`233`	`// "On a transacted channel, this check MUST be done immediately and`
`234`	`234`	`// not delayed until a Tx.Commit."`
`235`	`235`	`expectError(AMQP.PRECONDITION_FAILED);`
`236`		`- connection = null;`
`237`		`- openConnection();`
	`236`	`+ openChannel();`
`238`	`237`	`}`
`239`	`238`
`240`	`239`	`/*`