# run an external program from within Python code with
# subprocess.call(["program-name", "arg1", "arg2", ...])
import subprocess
 
# part of a loop
subprocess.call(["C:/Python25/Python.exe", "MyScript.py", "arg1", "arg2"])

import unittest
 
# The class to test
class Rectangle(object):
 
    def __init__(self, w, h):
        self.width = w
        self.height = h
 
    def get_width(self):
        return self._w
 
    def set_width(self, w):
        if w == None:
            raise ValueError
        self._w = w
 
    width = property(get_width, set_width)
 
    def get_height(self):
        return self._h
 
    def set_height(self, h):
        if h == None:
            raise ValueError
        self._h = h
 
    height = property(get_height, set_height)
 
    def area(self):
        return self.height * self.width
 
 
class TestRectangle(unittest.TestCase):  # the magic occurs here
                                                           # by subclassing TestCase
 
    def setUp(self):
        self.test_cases = [(2,3),(0,5),(-2.5,6)]
        self.test_widths = [2,0,-2.5]
        self.test_heights = [3,5,6]
        self.test_areas = [6,0,-15] 
        # the last element could be the subject of debate:
        # Should rectangles be allowed to have signed area and sides?
        # In the interest of physics, I decided Yes' (think flux here), but 
        # here in the test suite is the place that debate amongst the 
        # programming team could occur.
 
        self.error_cases = [(None,3),(5,None),(None,None)]
        self.error_results = [ValueError,ValueError,ValueError]
 
    def testHeight(self):
 
        self.Rects = [Rectangle(*x) for x in self.test_cases]
        self.assertEqual([x.height for x in self.Rects], self.test_heights)
 
    def testWidth(self):
 
        self.Rects = [Rectangle(*x) for x in self.test_cases]
        self.assertEqual([x.width for x in self.Rects], self.test_widths)
 
    def testArea(self):
 
        self.Rects = [Rectangle(*x) for x in self.test_cases]
        self.assertEqual([x.area() for x in self.Rects], self.test_areas)
 
    def testErrors(self):
 
        errors = dict(zip(self.error_cases, self.error_results))
        for x in errors:
            w,h = x
            self.assertRaises(errors[x], Rectangle, w, h)
 
if __name__ == "__main__":
 
    unittest.main()  #automagically creates an instance of my
                           # TestRectangle class, and runs each method.

FFEE
======================================================================
ERROR: testHeight (__main__.TestRectangle)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "C:/Python24/unittest_test.py", line 50, in testHeight
    self.assertEqual([x.height for x in self.Rects], self.test_heights)
  File "C:/Python24/unittest_test.py", line 21, in get_height
    return self._h
AttributeError: 'Rectangle' object has no attribute '_h'
 
======================================================================
ERROR: testWidth (__main__.TestRectangle)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "C:/Python24/unittest_test.py", line 55, in testWidth
    self.assertEqual([x.width for x in self.Rects], self.test_widths)
  File "C:/Python24/unittest_test.py", line 10, in get_width
    return self._w
AttributeError: 'Rectangle' object has no attribute '_w'
 
======================================================================
FAIL: testArea (__main__.TestRectangle)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "C:/Python24/unittest_test.py", line 60, in testArea
    self.assertEqual([x.area() for x in self.Rects], self.test_areas)
AssertionError: [None, None, None] != [6, 0, -15]
 
======================================================================
FAIL: testErrors (__main__.TestRectangle)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "C:/Python24/unittest_test.py", line 67, in testErrors
    self.assertRaises(errors[x], Rectangle, w, h)
AssertionError: ValueError not raised
 
----------------------------------------------------------------------
Ran 4 tests in 0.015s
 
FAILED (failures=2, errors=2)
 
Traceback (most recent call last):
  File "C:/Python24/unittest_test.py", line 71, in -toplevel-
    ut.main()
  File "C:\Python24\lib\unittest.py", line 759, in __init__
    self.runTests()
  File "C:\Python24\lib\unittest.py", line 797, in runTests
    sys.exit(not result.wasSuccessful())
SystemExit: True

....
----------------------------------------------------------------------
Ran 4 tests in 0.015s
 
OK
 
Traceback (most recent call last):
  File "C:/Python24/unittest_test.py", line 68, in -toplevel-
    unittest.main()
  File "C:\Python24\lib\unittest.py", line 759, in __init__
    self.runTests()
  File "C:\Python24\lib\unittest.py", line 797, in runTests
    sys.exit(not result.wasSuccessful())
SystemExit: False