在目录级别运行时，Python 3 单元测试失败

Question

I have two python unit test files in a folder

test/folder1/test_file1.py
test/folder2/test_file2.py

When I run the tests individually they pass, but when I run at the directory level the first test file passes but the second test file fails. Why would this happen? Both test files import some of the same modules. One file uses MagicMock the other doesn't

Pass commands
python3 -m pytest test/folder1/test_file1.py
python3 -m pytest test/folder1/test_file2.py

Fail command
python3 -m pytest test/folder1/

import commands in test_file1

import os
import shutil
import tempfile
import xlrd
from unittest import TestCase

from example.folder1 import module1
from example.folder4 import module4

Import commands in test_file2

import xlrd
from unittest import TestCase
from unittest.mock import MagicMock

from example.folder1 import module1 (same as test_file1)
from example.folder2 import module2
from example.folder3 import module3
import pkg_resources

Answer 1

Found the issue.

We were using a local CACHE variable. The first test was setting up the cache, the second test ended up using the cache from the first test.

Clearing the cache in setupClass() before running the second test solved the issue