[Pyunit-interest] PyUnit hangs when I do the following absurdly complicated thing

[Pat M. <jp...@cs...>]

When I call a PyUnit program from a Java program on Windows XP, and the=20=

PyUnit program trips an assertion, the Python program hangs. I don't=20
know what to try next. Anyone have any suggestions for how I could=20
learn more?

I wrote a short Java program (attachment 1) that uses Runtime to run a=20=

Python program. The specific call is:
Process child =3D Runtime.getRuntime().exec ("python TripAssert.py",=20
null, workDir);

The Python program (attachment 2) imports unittest and then creates a=20
test case. The test case has a single line, which is an assert.

When I run the Python program from the command line, it always works,=20
whether the assert is true or false. In either case, I get what I=20
expect.

When I run the Java program that runs the Python program, it will run=20
correctly if the assert is true (sample output 1). But, when the assert=20=

is false, the program hangs (sample output 2). Sample output 3 shows=20
the output when the assert is false and the Python program is run=20
directly.

I thought it might be running out of memory. I=92ve got 256 Mb. But, the=20=

Task Manager says there=92s over 100 Mb available.

I=92m pretty new to Windows programming (I=92m an old Unix programmer), =
and=20
I don=92t know how to figure out what=92s happening. What tools might I =
use=20
to try to find this? How can I find out what a process is waiting on?=20
Anyone seen anything like this?
Versions:
=95Python 2.3
=95PyUnit 1.4.1
=95Java j2sdk1.4.2_04
=95Windows XP Pro Version 5.1, Service Pack 1
--- Attachment 1: Java program -------
import java.io.File;
import java.io.InputStream;

public class TestCallPython {

	public static void main(String[] args) throws Exception {
		System.out.println ("TestCallPython\n");
		File workDir =3D new File ("\\Documents and =
settings\\a0868072\\my=20
documents\\work\\workspace\\TestCallPython");
		Process child =3D Runtime.getRuntime().exec ("python =
TripAssert.py",=20
null, workDir);

		displayOuts (child);
}
=09
	public static void displayOuts (Process child) throws Exception =
{
		System.out.println ("stdout");
       		InputStream in =3D child.getInputStream();
     		int c;
         		while ((c =3D in.read()) !=3D -1) {
             		System.out.print((char)c);
        		 }
         		in.close();
		System.out.println ("\nstderr");
	=09
         		InputStream er =3D child.getErrorStream();
         		while ((c =3D er.read()) !=3D -1) {
             		System.out.print((char)c);
        		 }
        		er.close();
		System.out.println ("end");
	}
}
--- Attachment 2: Python program -------
import unittest

class LoggingTestCase (unittest.TestCase):
     def	test1Assert1 (self):
         #self.assertEqual (1, 2)
         self.assertEqual (1, 1)


suite =3D unittest.makeSuite(LoggingTestCase,'test')

if __name__ =3D=3D "__main__":
     unittest.main()

--- Sample output 1: when assertEqual (1, 1) compiled in -------
C:\Documents and Settings\a0868072\My=20
Documents\work\workspace\TestCallPython>java TestCallPython
TestCallPython

stdout

stderr
.
----------------------------------------------------------------------
Ran 1 test in 0.000s

OK
end

C:\Documents and Settings\a0868072\My=20
Documents\work\workspace\TestCallPython>

--- Sample output 2: when assertEqual (1, 2) compiled in, from Java=20
-------
C:\Documents and Settings\a0868072\My=20
Documents\work\workspace\TestCallPython>java TestCallPython
TestCallPython

stdout

{Note: I waited about 10 seconds, then hit ^C here.}
C:\Documents and Settings\a0868072\My=20
Documents\work\workspace\TestCallPython>

--- Sample output 3: when assertEqual (1, 2) compiled in, from Python=20
-------
C:\Documents and Settings\a0868072\My=20
Documents\work\workspace\TestCallPython>python TripAssert.py
F
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
FAIL: test1Assert1 (__main__.LoggingTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
   File "TripAssert.py", line 5, in test1Assert1
     self.assertEqual (1, 2)
   File "c:\python23\lib\unittest.py", line 302, in failUnlessEqual
     raise self.failureException, \
AssertionError: 1 !=3D 2

----------------------------------------------------------------------
Ran 1 test in 0.000s

FAILED (failures=3D1)

C:\Documents and Settings\a0868072\My=20
Documents\work\workspace\TestCallPython>

---
Pat McGee
Ph.D. Student, Computer Sciences Department, Florida Institute of=20
Technology
Treasurer, Association for Software Testing, Inc.=20
(http://AssociationForSoftwareTesting.org)
Editor, CS Department Tech Report Library (http://cs.fit.edu/~tr)

jpm...@cs...
http://blackbox.cs.fit.edu/blog/pat