I want to apply TDD (test driven development) on my project. I am
working on a class like this (in plan):
# file: myclass.py
import _extmod
class MyClass(object):
def __init__(self):
self.handle = _extmod.open()
def __del__(self):
_extmod.close(self.handle)
def some_stuff(self):
_extmod.foobar(self.handle)
...
As you see, it is an OO wrapper on _extmod, which is a pyrex extension
module. The question is: how to unittest this class? As the _extmod
is hardware-dependent, I want to use a mock class to replace it in unit
test. But how can I let myclass in unittest to import the mock class?
Like the following:
class MyClassTest(unittest.TestCase):
def setUp(self):
import myclass
import mocklib
myclass.change_extmod(mocklib.MockExtMod())
self.testobj = myclass.MyClass() # here MyClass.__init__ will
call the open
# method of MockExtMod class
instead of
# _extmod.open()
...
How to implement the change_extmod? (Or maybe my idea is totally
wrong?)
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