Test fix

Author: igor_bolotin

src/test/java/com/rabbitmq/client/test/functional/FrameMax.java

@@ -121,20 +121,23 @@ public FrameMax() {
 
         Map<String, Object> headers = new HashMap<String, Object>();
         String headerName = "x-huge-header";
-        headers.put(headerName, "");
+        headers.put(headerName, LongStringHelper.asLongString(new byte[0]));
 
         AMQP.BasicProperties properties = new AMQP.BasicProperties.Builder().headers(headers).build();
 
         ByteArrayOutputStream baos = new ByteArrayOutputStream();
-        properties.writePropertiesTo(new ContentHeaderPropertyWriter(new DataOutputStream(baos)));
-        int overhead = baos.size();
+        DataOutputStream dos = new DataOutputStream(baos);
+        properties.writePropertiesTo(new ContentHeaderPropertyWriter(dos));
+        dos.flush();
+        int overhead = baos.size() + 12;
 
         headers.put(headerName, LongStringHelper.asLongString(new byte[REAL_FRAME_MAX - overhead]));
+        properties = new AMQP.BasicProperties.Builder().headers(headers).build();
 
         basicPublishVolatile(new byte[100], "x", "foobar", properties);
         assertDelivered(queueName, 1);
 
-        headers.put(headerName, LongStringHelper.asLongString(new byte[REAL_FRAME_MAX - overhead - 1]));
+        headers.put(headerName, LongStringHelper.asLongString(new byte[REAL_FRAME_MAX - overhead + 1]));
         properties = new AMQP.BasicProperties.Builder().headers(headers).build();
 
         try {