Why have you created 4 posts like this one? Delete the other 3, use Github Codewars Issue tracker

Fixed.

Test case are run sequentially therefore if the code produced include a global variable, you want to make sure to re-initialize each global variable at the beginning of the solve method.

I hope this clue help you.

What language?

I'm not sure if I'm understanding, but just download cw-2.py and import it in your test?

Make new directory to experiment in and download the test framework.

mkdir codewars-local-py
cd codewars-local-py
wget https://raw.githubusercontent.com/Codewars/python-test-framework/master/cw-2.py

Add solution.py:

def add(a, b):
    return a + b

Add test.py:

test = __import__("cw-2")
from solution import add

@test.describe("add")
def describe_add():
    @test.it("adds two ints")
    def it_adds_two_ints():
        test.assert_equals(add(1, 1), 2)

Run tests:

python test.py

See https://github.com/Codewars/python-test-framework instead. It has few updates and that's where it's maintained now.

How do I install the Python test library

I can not make your tests

These are 2 totally different things. In case you're interested in the latter, custom framework is used here.