RE: [Junit-devel] How do I check for output from a method sent to the console via System.out.println?

[Keith H. <kh...@ax...>]

You could capture standard output (using System.setOut(...)) into your
own OutputStream - e.g. to a file or ByteArrayOutputStream, then check
the content of that stream. Just make sure you hold the original
System.out somewhere and reset it in a finally block.
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Hope this helps
Keith
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	-----Original Message-----
	From: jun...@li...
[mailto:jun...@li...] On Behalf Of Janette
Wong
	Sent: 03 April 2006 21:20
	To: jun...@li...
	Subject: [Junit-devel] How do I check for output from a method
sent to the console via System.out.println?
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	Hi, my apologies if this question appears twice... I sent it
once to the mailing list and found out I have to subscribe to the list
first.   So I subscribed and here's my question again.=20
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	My question is on testing a couple of Strings sent to the
console.   e.g. I have this method:=20
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	        public static void usage() {=20
	                System.out.println("Usage: BookStoreServer
employeeID [seed]");=20
	                System.out.println("where employeeID is from
E0000 to E9999");=20
	        }=20
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	The usage() method is called under some circumstances.=20
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	I wrote a JUnit test (see snippet below).   When
StartServer.main() is called with 3 arguments, it should cause the
usage() method above to be invoked and output messages to the console.
Question is, I don't know how to use assertEquals() or other means to=20
	check that those message have indeed been sent to the console.=20
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	        public void
testStartServerNumOfArgsMoreThanUpperBound(){=20
	                String[] argsArray =3D {"E0001", "1234",
"invalid3rdArgument"};                =20
	                StartServer.main(argsArray);=20
	                //assertEquals("Usage: BookStoreServer
employeeID [seed]");   // Have to figure out how to assert the output
from usage()=20
	        }=20
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	Appreciate any guidance, thanks.=20
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	Janette Wong=20
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