CODEWITHSUNDEEP
pythonunit-testingpackage
Sahand
Sahand

Reputation: 8360

Python unittest import problems

I'm having a tough time understanding packages, and specifically how to use unittest with packages. I looked at this question () but the correct answer to that question didn't solve my problem. I have the following structure:

model
|-- __init__.py
|-- boardmodel.py
|
|-- exceptions
|   |
|   |-- __init__.py
|   |-- exceptions.py
|
|-- test
    |-- __init__.py
    |-- test_boardmodel.py

With the following files/imports:

model/__init__.py:

import model.exceptions.exceptions
import model.boardmodel

model/exceptions/__init__.py:

contains nothing

model/test/__init__.py:

contains nothing

imports inside boardmodel.py::

from model.exceptions.exceptions import ZeroError, OverlapError, ArgumentError, ProximityError

imports inside test_boardmodel.py:

import unittest

from model.boardmodel import Board, Ball, Wall
from model.exceptions.exceptions import ProximityError

I place myself in the model-directory and I run python -m unittest test.test_boardmodel.py. I get the following message:

ERROR: test_boardmodel (unittest.loader._FailedTest)
----------------------------------------------------------------------
ImportError: Failed to import test module: test_boardmodel
Traceback (most recent call last):
  File "/usr/local/Cellar/python3/3.6.2/Frameworks/Python.framework/Versions/3.6/lib/python3.6/unittest/loader.py", line 153, in loadTestsFromName
    module = __import__(module_name)
  File "/Users/sahandzarrinkoub/Documents/Programming/pythonfun/BouncingBalls/balls/src/model/test/test_boardmodel.py", line 3, in <module>
    from model.boardmodel import Board, Ball, Wall
ModuleNotFoundError: No module named 'model'

I'm a bit lost with how the imports work and what location the modules/packages are looked for when an import statement is executed. Why isn't model found?

I shall add that if I remove model. from all the imports listed, the tests work, but I can't use the package from "outside" anymore:

src
|-- visual.py
|
|-- model
    |-- __init__.py
    |-- boardmodel.py
    |
    |-- exceptions
    |   |
    |   |-- __init__.py
    |   |-- exceptions.py
    |
    |-- test
        |-- __init__.py
        |-- test_boardmodel.py

inside visual.py:

import model
from model.boardmodel import Board

Upvotes: 13

Views: 19458

Answers (3)

Alan
Alan

Reputation: 9610

I believe the standard package structure is 

  myproject
  ├── myproject
  ├── tests
  └── scripts

If you want to run the test without installing the package, run them from the top myproject folder so that import myproject will succeed in your tests. (Similarly for the scripts.) For this to work, use absolute imports or explicit relative imports in myproject.

Upvotes: 3

JoeMjr2
JoeMjr2

Reputation: 3944

Try adding the following above your import statements:

sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), "..")))

Upvotes: 4

Laura Vieira
Laura Vieira

Reputation: 165

I was facing the same issue, being able to import some modules from several files, but not from a test file, so I saw this solution:

If you have test/my_test.py, tests should be run as: 

python -m test.my_test

After that, I imported what I wanted and got no errors.

Upvotes: 12

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