python unittest在源代码中相对导入失败

Question

I have my python source code and unittest code structure in the following hierarchy:

bin/
    module1.py
    module2.py
    module3.py
test/
    module1_test.py

The code in the modules are as follows: module1.py

from module2 import testMethod1, testMethod2
def testMethodY():
    ...
    ...
    ...

module2.py

from module3 import testMethod4

module3.py

def testMethod4():

module1_test.py

import unittest
import sys, os
path = os.path.dirname(__file__)
path = os.path.join(path, 'bin')
sys.path.append("/bin")
from module1 import testMethodY

...(Some code for unit test)

when I run python module1_test.py it fails with import error:

ImportError: cannot import name testMethod4

Not sure what is wrong. If I run the source code then all the imports are working fine. But with python unittest these relative imports are failing. Can anyone tell me what mistake i'm doing.

Answer 1

Create an __init__.py module in your tests folder and add the following to it:

import sys, os
path = os.path.dirname(__file__)
path = os.path.join(path, 'bin')
if path not in sys.path:
    sys.path.append(path)

Answer 2

I think your path append statement is incorrect. You are appending /bin which would look for bin in the disk root.

sys.path.append("/usr/lib/bin")

Answer 3

The issue was because of another module with the same name coming from python libs. I renamed it and that solved the issue. Another approach that helped is setting the module to PYTHONPATH.