Circle-CI ImportError: Failed to import test module Python 3.7.0

Question

I'm trying to setup Circle-CI for the first time for my application. It's a python 3.7.0 based app with a few tests. The app builds just fine, but fails when running the test job. Locally the tests work fine, so I assume I'm missing some Circle-CI configuration?

This is my yaml:

version: 2.0
jobs:
  build:
    docker:
      - image: circleci/python:3.7.0
    steps:
      - checkout
      - run:
          name: "Run tests"
          command: python -m unittest

This is the error:

======================================================================

ERROR: tests.test_auth (unittest.loader._FailedTest)

ImportError: Failed to import test module: tests.test_auth Traceback (most recent call last): File "/usr/local/lib/python3.7/unittest/loader.py", line 434, in _find_test_path module = self._get_module_from_name(name) File "/usr/local/lib/python3.7/unittest/loader.py", line 375, in _get_module_from_name import(name) File "/home/circleci/project/tests/test_auth.py", line 5, in from werkzeug.datastructures import MultiDict ModuleNotFoundError: No module named 'werkzeug'

What am I missing?

EDIT:

I have added now pip install -r requirements.txt but I get now:

Could not install packages due to an EnvironmentError: Errno 13] Permission denied: '/usr/local/lib/python3.7/site-packages/MarkupSafe-1.1.1.dist-info'

EDIT:

In addition to the answer, here is complete yaml configuration working:

version: 2.0
jobs:
  build:
    docker:
      - image: circleci/python:3.7.0
    steps:
      - checkout
      - run:
          name: "Install dependencies"
          command: |
            python3 -m venv venv
            . venv/bin/activate
            pip install --upgrade pip
            pip install --no-cache-dir -r requirements.txt
      - run:
          name: "Run tests"
          command: |
            . venv/bin/activate
            python -m unittest

Answer 1

It simply means that a dependency 'werkzeug' is not installed. You might need to install additional packages which are required separately.

Consider adding the dependency installations to the Dockerfile something like below

RUN pip install --upgrade pip && \
    pip install --no-cache-dir -r requirements.txt

If you get permission denied issues, then your tests are started with a user who have no privileges to manage python. But its unlikely to be so.