Python Unit Test Automation

Listing 3-19.  test_module13.py
import unittest
class TestClass14(unittest.TestCase):
    def test_case01(self):
        raise Exception
The output of Listing 3-19 is as follows:
test_case01 (test_module13.TestClass14) ... ERROR
======================================================================
ERROR: test_case01 (test_module13.TestClass14)
----------------------------------------------------------------------
Traceback (most recent call last):
   File "/home/pi/book/code/chapter03/test/test_module13.py", line 6, in 
test_case01
    raise Exception
Exception
----------------------------------------------------------------------
Ran 1 test in 0.004s
FAILED (errors=1)
The failure message shown when the test fails due to an exception is different from 
when the test fails due to an assertion.

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Chapter 3 
■
 Unittest
60
assertRaises()
You learned that the assert methods are used to check the test conditions. The 
assertRaises() method is used to check if the code block raises the exception 
mentioned in assertRaises(). If the code raises the exception then the test 
passes; otherwise, it fails. The code shown in Listing 
3-20
 demonstrates the usage of 
assertRaises() in detail.