[Tutor] Unexpected Behavior in unittest

[Danny Yoo]

> I wish it were that simple.  'test3.py' is the name of the file
> containing the test case class.  I left the invocation out of my output
> excerpt.  It should look like this:

Hi Barry,


Ok.

But still go back and make sure you're running the right file.  The error
message says that:

> Traceback (most recent call last):
>   File "J:\My Documents\Projects\Mongoose\symgen\test3.py", line 25, in
> test_cs

So Python's running a program that has at least 25 lines in it.


But the test3.py file you've shown us at the bottom of:

     http://mail.python.org/pipermail/tutor/2006-February/045423.html

just simply doesn't have that many lines.  Let's look again at the program
you're showing us as 'test3.py':

###########################################
#!/usr/bin/python2.3
from lblgen import *
import unittest

class cs_tryout(unittest.TestCase):

    def test_cs(self):
        lg = lblgen(t = 'Any string here')
        msg = ('Generator cs is incorrect.\nExpected %3.1f; got %3.1f' %
               (1.0, lg.cs))
        self.assertEqual(1.0, lg.cs, msg)
        lbl = lg.generate()
        msg = 'txtlst entry %d is incorrect.\nExpected %3.1f; got %3.1f'
        for ndx, got in enumerate(lbl.txtlst[lbl.chlen::lbl.chlen]):
            self.assertEqual(1.0, got, msg % (ndx, 1.0, got))

        lg.cs = 2.5
        msg = ('Generator cs is incorrect.\nExpected %3.1f; got %3.1f' %
               (2.5, lg.cs))
        self.assertEqual(2.5, lg.cs, msg)
        lbl = lg.generate()
        msg = 'txtlst entry %d is incorrect.\nExpected %3.1f; got %3.1f'
        for ndx, got in enumerate(lbl.txtlst[lbl.chlen::lbl.chlen]):
            self.assertEqual(2.5, got, msg % (ndx, 2.5, got))


if __name__=='__main__':
    unittest.main( )
###########################################


What you're showing us above --- what you think is test3.py --- and what
the error message is saying here:

#########################################################################
Traceback (most recent call last):
  File "J:\My Documents\Projects\Mongoose\symgen\test3.py", line 25, in
test_cs
    self.assertEqual(expect, lg.cs, msg)
  File "C:\PROGRA~1\Python23\lib\unittest.py", line 302, in
failUnlessEqual
    raise self.failureException, \
#########################################################################

presents two inconsistent views of what should be the same exact program.


We can look at this more closely: the error message has a reference to an
'expect' variable name, but this doesn't exist in the program you're
showing us.  Python isn't magical, so I have to assume that some program,
different than the one you've shown us, is being executed.


Does this make sense?