Question

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How do you test that a Python function throws an exception?

I have to do white-box and black-box testing so i`m wondering how it is possible to test a function that trows an exceptions, like this one

class validator_client():

    def validate_client(self,client):
        erori=[]
        if client.get_identitate()=="":
            erori.append("Nu exista ID!")
        if client.get_nume()=="":
            erori.append("Nu exista nume!")
        if (client.get_filme_inchiriate()!="da" ) and (client.get_filme_inchiriate()!="nu") :
            erori.append("Campul 'Filme inchiriate' completat gresit!")
        if len(erori)>0:
            raise ValidatorException(erori)

I`ve read something about assertRises() but i can not import the module with this method, found this on stackowerflow:

from testcase import TestCase

import mymod

class MyTestCase(TestCase):
    def test1(self):
        self.assertRaisesWithMessage(SomeCoolException,
                                     'expected message',
                                      mymod.myfunc)

but I`m not able to make it work.

Answer 1

This is a working example that is a simplified version of what you will find in the python docs. It checks that random.shuffle raises a TypeError exception.

import random, unittest

class TestSequenceFunctions(unittest.TestCase):
    def test_shuffle(self):
        self.assertRaises(TypeError, random.shuffle, (1,2,3))

unittest.main()