Troubleshooting CI/CD Pipeline: Python Tests Failing Only in Docker Environment
I've encountered a strange issue with I've looked through the documentation and I'm still confused about Setting up a CI/CD pipeline for a Django application, I've faced an oddity where my integration tests work perfectly on local but fail when executed in a Docker container. The tests utilize Django's test client and rely on a PostgreSQL database with a specific schema. Here’s what I’ve tried: 1. **Dockerfile Configuration**: The Dockerfile seems straightforward. It installs the necessary packages, runs migrations, and sets up the database. Yet, the tests fail with a `django.db.utils.ProgrammingError: relation "myapp_mymodel" does not exist` error. ```Dockerfile FROM python:3.10 WORKDIR /app COPY requirements.txt . RUN pip install -r requirements.txt COPY . . RUN python manage.py migrate ENTRYPOINT ["python", "manage.py", "test"] ``` 2. **Database Initialization**: I verified that the database is initialized correctly. The `docker-compose.yml` has a specific section for the database service. ```yaml version: '3.8' services: db: image: postgres:13 environment: POSTGRES_DB: mydatabase POSTGRES_USER: user POSTGRES_PASSWORD: password networks: - mynetwork web: build: . depends_on: - db networks: - mynetwork networks: mynetwork: ``` 3. **Environment Variable Issues**: On the advice of the community, I ensured that my environment variables are passed correctly into Docker. Still, the tests fail, indicating the database schema isn’t set up in time before the tests run. 4. **Waiting for the Database**: I’ve tried adding a wait-for-it script before running the tests to ensure the database is ready. This approach helped in previous projects, but not here. The tests still fail intermittently. 5. **Debugging with Logs**: I added logging to see if the migrations were successful. The logs show that migrations complete, yet the test run still fails. ```python import logging logger = logging.getLogger(__name__) class MyTestCase(TestCase): def setUp(self): logger.info('Setting up the test case...') super().setUp() # Runs migrations ``` The tests have dependencies on certain fixtures that may not be in place when the tests run. I thought about adding a `wait` parameter in my tests to check for the existence of the table, but that feels hacky. Does anyone have insights on how to ensure that the database schema is fully ready before the tests execute in Docker? Or are there best practices to manage fixture loading in this context? Any help would be appreciated! I'm working on a service that needs to handle this. Am I missing something obvious? I'm using Python LTS in this project. What would be the recommended way to handle this?