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I am struggeling getting a python import right. What I want to achieve is to have a module with several source files and a test folder with unit tests.
No matter what I do, I can't get py.test-3 to execute my tests. My directory layout looks like this:
.
├── module
│ ├── __init__.py
│ └── testclass.py
└── tests
└── test_testclass.py
The __init__.py file looks like this:
__all__ = ['testclass']
The testclass.py file looks like this:
class TestClass(object):
def __init__(self):
self.id = 1
And my unit test like this:
import pytest
from module import TestClass
def test_test_class():
tc = TestClass()
assert(tc.id==1)
No matter how I call py.test-3 I will end up with a:
E ImportError: No module named 'module'
781
This is caused by the fact that the version of Python you're running your script with is not configured to search for modules where you've installed them. This happens when you use the wrong installation of pip to install packages.
The __init__.py files are required to make Python treat directories containing the file as packages. This prevents directories with a common name, such as string , unintentionally hiding valid modules that occur later on the module search path.
append() Function. This is the easiest way to import a Python module by adding the module path to the path variable. The path variable contains the directories Python interpreter looks in for finding modules that were imported in the source files.
First, unless you change the tests/test_testclass.py, you need to change module/__init__.py as follow:
from .testclass import TestClass
__all__ = ['TestClass']
And, when you run py.test set PYTHONPATH environment variable to let the interpreter know when to find modules:
PYTHONPATH=. py.test
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