Python Unit Test Automation

Listing 4-8.  test_module06.py
from nose.tools import ok_, eq_
def test_case01():
    ok_(2+2 == 4, msg="Test Case Failure...")
def test_case02():
    eq_(2+2, 4, msg="Test Case Failure...")
def test_case03():
    ok_(2+2 == 5, msg="Test Case Failure...")
def test_case04():
    eq_(2+2, 5, msg="Test Case Failure...")
The following shows the output of the code in Listing 
4-8
.
In setUpPackage()...
test.test_module06.test_case01 ... ok
test.test_module06.test_case02 ... ok
test.test_module06.test_case03 ... FAIL
test.test_module06.test_case04 ... FAIL
In tearDownPackage()...

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Chapter 4 
■
 nose and nose2
78
======================================================================
FAIL: test.test_module06.test_case03
----------------------------------------------------------------------
Traceback (most recent call last):
   File "/usr/local/lib/python3.4/dist-packages/nose/case.py", line 198,  
in runTest
    self.test(*self.arg)
   File "/home/pi/book/code/chapter04/test/test_module06.py", line 13,  
in test_case03
    ok_(2+2 == 5, msg="Test Case Failure...")
AssertionError: Test Case Failure...
======================================================================
FAIL: test.test_module06.test_case04
----------------------------------------------------------------------
Traceback (most recent call last):
   File "/usr/local/lib/python3.4/dist-packages/nose/case.py", line 198,  
in runTest
    self.test(*self.arg)
   File "/home/pi/book/code/chapter04/test/test_module06.py", line 17,  
in test_case04
    eq_(2+2, 5, msg="Test Case Failure...")
AssertionError: Test Case Failure...
----------------------------------------------------------------------
Ran 4 tests in 0.015s
FAILED (failures=2)
The @raises() Decorator
When you use raises decorator before the test, it must raise one of the exceptions 
mentioned in the list of exceptions associated with the @raises() decorator. Listing 
4-9
 
demonstrates this idea.