Exceptions are not handled in assertRaise()

Question

I am having trouble and difficulties with Pilgrim's Dive into python 3 Unit Testing chapter. I've run the exact same code in romantest2.py. Exceptions are not being handled in the code provided on the examples. I have deduced the example on the book into a smaller snippet:

TestCase1.py

import unittest class ToRomanBadInput(unittest.TestCase): def test_too_large(self): '''to_roman should fail with large input''' self.assertRaises(roman2.OutOfRangeError,roman2.to_roman,4000) if __name__ == '__main__': unittest.main()

the file roman2.py

class OutOfRangeError(ValueError): pass def to_roman(n): raise OutOfRangeError("Value n {0} is larger than 3999.".format(n))

I can't seem to move on this part. What happen is that I expect the test case to fail. But it didn't instead it shows:

.. ------------------------------------------------------------ Ran 2 tests in 0.000s OK

I am using and running this code PyDev in Eclipse and the version of python is version 3.3.3

Martijn Pieters · Accepted Answer · 2014-03-15 18:30:42Z

1

You are asserting that the to_roman() function raises an exception. That test succeeds, your function indeed raises the exception.

answered Mar 15, 2014 at 18:30

Martijn Pieters

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1 Comment

nww04 Over a year ago

Thanks I am so stunned. I am such an idiot. Of course it works! I complete misunderstood unit testing. Now I understand it! This could have saved me a lot of trouble before! Thanks a lot.

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