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#!/usr/bin/env python

"""

This module tests that the scripts are all callable.

"""

import errno

import subprocess

import sys

import unittest

from abc import ABCMeta, abstractmethod

from .config import *

class CanScriptTest(unittest.TestCase, metaclass=ABCMeta):

@classmethod

def setUpClass(cls):

# clean up the argument list so the call to the main() functions

# in test_does_not_crash() succeeds

sys.argv = sys.argv[:1]

def test_do_commands_exist(self):

"""This test calls each scripts once and verifies that the help

can be read without any other errors, like the script not being

found.

"""

for command in self._commands():

try:

subprocess.check_output(

command.split(),

stderr=subprocess.STDOUT,

encoding="utf-8",

shell=IS_WINDOWS,

)

except subprocess.CalledProcessError as e:

return_code = e.returncode

output = e.output

else:

return_code = 0

output = "-- NO OUTPUT --"

allowed = [0, errno.EINVAL]

self.assertIn(

return_code,

allowed,

'Calling "{}" failed (exit code was {} and not SUCCESS/0 or EINVAL/22):\n{}'.format(

command, return_code, output

),

)

def test_does_not_crash(self):

# test import

module = self._import()

# test main method

with self.assertRaises(SystemExit) as cm:

module.main()

self.assertEqual(cm.exception.code, errno.EINVAL)

@abstractmethod

def _commands(self):

"""Returns an Iterable of commands that should "succeed", meaning they exit

normally (exit code 0) or with the exit code for invalid arguments: EINVAL/22.

"""

pass

@abstractmethod

def _import(self):

"""Returns the modue of the script that has a main() function."""

pass

class TestLoggerScript(CanScriptTest):

def _commands(self):

commands = [

"python -m can.logger --help",

"can_logger --help",

]

return commands

def _import(self):

import can.logger as module

return module

class TestPlayerScript(CanScriptTest):

def _commands(self):

commands = [

"python -m can.player --help",

"can_player --help",

]

return commands

def _import(self):

import can.player as module

return module

class TestLogconvertScript(CanScriptTest):

def _commands(self):

commands = [

"python -m can.logconvert --help",

"can_logconvert --help",

]

return commands

def _import(self):

import can.logconvert as module

return module

# TODO add #390

# this excludes the base class from being executed as a test case itself

del CanScriptTest

if __name__ == "__main__":

unittest.main()