I am having little trouble using the python setUpClass.
For example consider the following case
class MyTest(unittest.case.TestCase):
@classmethod
def setUpClass(cls):
print "Test setup"
try:
1/0
except:
raise
@classmethod
def tearDownClass(cls):
print "Test teardown"
A couple of questions
Is the above code the right way to handle test setUpClass exceptions (by raising it so that the python unittest can take care of it), there are fail(), skip() methods, but those can only be used by test instances and not the test classes.
When there is a setUpClass exception, how can we ensure that tearDownClass runs (unittest doesn't run it, should we manualy call it).
There are two ways you can use assertRaises: using keyword arguments. Just pass the exception, the callable function and the parameters of the callable function as keyword arguments that will elicit the exception. Make a function call that should raise the exception with a context.
An exception object is created when a Python script raises an exception. If the script explicitly doesn't handle the exception, the program will be forced to terminate abruptly.
PyUnit is an easy way to create unit testing programs and UnitTests with Python. (Note that docs.python.org uses the name "unittest", which is also the module name.)
Internally, unittest. main() is using a few tricks to figure out the name of the module (source file) that contains the call to main() . It then imports this modules, examines it, gets a list of all classes and functions which could be tests (according the configuration) and then creates a test case for each of them.
You can call tearDownClass
on an exception as Jeff points it out, but you may also implements the __del__(cls)
method :
import unittest
class MyTest(unittest.case.TestCase):
@classmethod
def setUpClass(cls):
print "Test setup"
try:
1/0
except:
raise
@classmethod
def __del__(cls):
print "Test teardown"
def test_hello(cls):
print "Hello"
if __name__ == '__main__':
unittest.main()
Will have the following output :
Test setup
E
======================================================================
ERROR: setUpClass (__main__.MyTest)
----------------------------------------------------------------------
Traceback (most recent call last):
File "my_test.py", line 8, in setUpClass
1/0
ZeroDivisionError: integer division or modulo by zero
----------------------------------------------------------------------
Ran 0 tests in 0.000s
FAILED (errors=1)
Test teardown
Note : you should be aware that the __del__
method will be called at the end of the program execution, which is maybe not what you want if you have a more than one test class.
Hope it helps
The best option would be is to add handler for the except which calls tearDownClass and re-raise exception.
@classmethod
def setUpClass(cls):
try:
super(MyTest, cls).setUpClass()
# setup routine...
except Exception: # pylint: disable = W0703
super(MyTest, cls).tearDownClass()
raise
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