I have a python script called script.py, this need a input A and generate a output B.
A -> script.py -> B
every time I add a new feature, I need to check that the program generate the same output.
how I can automated this tests type ?
what is the name of this tests type ?
exists some python module for this tests type ?
From what I understand,
You want to test if that piece of code (unit) is doing what it's supposed to. That's Unit Testing.
What you can do is make a test that gives script.py it's input (A), and gets the output produced. Then you can just check if the output matches.
class OutputTestCase(unittest.TestCase):
def get_output(self, input):
... # You haven't mentioned how "input" is taken or how output is taken.
def test_script(self):
input = ...
expected = ...
output = self.get_output(input)
self.assertEqual(output, expected)
PS: That's how PLY tests it's code. And I'm fiddling with it!
You can write an except script to automate this.
You can use pytest for your testing. So what you can do is create a testing_suite.py and put your tests in it with name starting as test_ for ex: test_B, test_C etc
# testing_suite.py
import pytest
def test_B:
proc = subprocess.Popen(['python', 'script.py', 'arg1'], stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
output = proc.communicate()[0]
if output == 'B':
print "testB done" # or something else depends on you
def test_C:
....
....
then you can run as:
$> py.test
So this should execute all tests with test_. Please check pytest doc here for test discovery rules.
mv B _B; python script.py A; diff B _B