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unit testing failure makes no sense

I have some unit testing code in one of my modules that appears to
run without an error, but the unit test fails anyhow. Have a look at
the output below -- the TestResult seems to have no errors and no
failures, yet I get a system exit.

exceptions.Syst emExit Traceback (most
recent call last)

/Users/chris/<ipython console>

/Library/Frameworks/Python.framewor k/Versions/2.4/lib/python2.4/
unittest.py in __init__(self=< unittest.TestPr ogram object at
0x10ee670>, module='__main_ _', defaultTest=Non e, argv=['/usr/local/
bin/ipython'], testRunner=None , testLoader=<uni ttest.TestLoade r
object at 0x606290>)
757 self.progName = os.path.basenam e(argv[0])
758 self.parseArgs( argv)
--759 self.runTests()
self.runTests = <bound method TestProgram.run Tests of
<unittest.TestP rogram object at 0x10ee670>>
761 def usageExit(self, msg=None):

/Library/Frameworks/Python.framewor k/Versions/2.4/lib/python2.4/
unittest.py in runTests(self=< unittest.TestPr ogram object at 0x10ee670>)
795 self.testRunner = TextTestRunner
(verbosity=self .verbosity)
796 result = self.testRunner .run(self.test)
--797 sys.exit(not result.wasSucce ssful())
global sys.exit = <built-in function exit>
result.wasSucce ssful = <bound method
_TextTestResult .wasSuccessful of <unittest._Text TestResult run=3
errors=0 failures=0>>
799 main = TestProgram

SystemExit: False
Type exit or quit to exit IPython (%Exit or %Quit do so
unconditionally ).

Any ideas what is going wrong here? Here is my testing code:

class MCMCTest(unitte st.TestCase):

def testCoalMiningD isasters(self):
"""Run coal mining disasters example sampler"""

print 'Running coal mining disasters test case ...'

# Create an instance of the sampler
self.sampler = DisasterSampler ()

# Specify the nimber of iterations to execute
iterations = 10000
thin = 2
burn = 5000
chains = 2

# Run MCMC simulation
for i in range(chains):

self.failUnless (self.sampler.s ample(iteration s,
burn=burn, thin=thin, plot=True))

# Run convergence diagnostics
self.sampler.co nvergence()

# Plot autocorrelation
self.sampler.au tocorrelation()

# Goodness of fit
x, n = self.sampler.go odness(iteratio ns/10)['overall']
self.failIf(x/n < 0.05 or x/n 0.95)
Christopher Fonnesbeck
+ Atlanta, GA
+ fonnesbeck at mac.com
+ Contact me on AOL IM using email address
Aug 30 '06 #1
1 1813
li*******@mac.c om wrote:
I have some unit testing code in one of my modules that appears to
run without an error, but the unit test fails anyhow. Have a look at
the output below -- the TestResult seems to have no errors and no
failures, yet I get a system exit.
sys.exit(0) is just a normal way to exit a program, and it is implemented as
'raise SystemExit'. You seem to be running your test from within ipython
which probably catches SystemExit exceptions to prevent you from losing
state. Try running your test from the shell and all should be OK.

Aug 30 '06 #2

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