Question

I want to have a little script, that will find, run and report about all the tests in the folder, like this one:

#!/bin/bash 
coverage run -m unittest discover 
coverage report -m

But, when I run it, I get some errors, which I do not get on Windows (like using of super() without an argument). As I've understood, it's connected with the fact, that build-in and default version of Python on Linux is 2.x, whereas I am using 3.6. How should I change the script, so it would use Python 3.6 interpreter?

EDIT: So here's one of the files with tests that I run:

#!/usr/bin/env python3
import unittest
import random
import math
import sort_functions as s
from comparison_functions import less, greater


class BaseTestCases:
    class BaseTest(unittest.TestCase):
        sort_func = None

        def setUp(self):
            self.array_one = [101, -12, 99, 3, 2, 1]
            self.array_two = [random.random() for _ in range(100)]
            self.array_three = [random.random() for _ in range(500)]
            self.result_one = sorted(self.array_one)
            self.result_two = sorted(self.array_two)
            self.result_three = sorted(self.array_three)

        def tearDown(self):
            less.calls = 0
            greater.calls = 0

        def test_sort(self):
            result_one = self.sort_func(self.array_one)
            result_two = self.sort_func(self.array_two)
            result_three = self.sort_func(self.array_three)
            self.assertEqual(self.result_one, result_one)
            self.assertEqual(self.result_two, result_two)
            self.assertEqual(self.result_three, result_three)

    # and some more tests here       


class TestBubble(BaseTestCases.BaseTest):
    def setUp(self):
    self.sort_func = s.bubble_sort
    super().setUp()

# and some more classes looking like this

And the error:

ERROR: test_key (test_sort_func.TestBubble)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/lelik/Desktop/Sorters/test_sort_func.py", line 67, in setUp
super().setUp()
TypeError: super() takes at least 1 argument (0 given)

Answer 1

First, install it for your python3 (if you have it and pip installed) sudo python3 -m pip install coverage

Then, in order to run coverage for python3, run python3 -m coverage report -m

So your final script should look like this:

#!/bin/bash 
python3 -m coverage run -m unittest discover 
python3 -m coverage report -m

Also you can replace python3 with path to your pythons bin. For example /usr/bin/python3. So You can call it this way as well:

#!/bin/bash 
/usr/bin/python3 -m coverage run -m unittest discover 
/usr/bin/python3 -m coverage report -m

Answer 2

The problem is that the coverage command on your Linux host has been installed for Python 2. That is, somewhere there exists a coverage script that starts with:

#!/usr/bin/python

And on your system, /usr/bin/python is python 2.

The best solution here is probably to set up a Python 3 virtual environment for running your tests (and then installing coverage into that virtualenv). You may also want to investigate tox, which will handle this for you automatically.

How to use Python 3.6 interpreter inside a bash script?

2 个答案: