Can you share your experience using Docker containers in projects?

In QA and test automation projects, I used Docker to create isolated and reproducible environments. For example, I ran containers with the required browser versions for UI tests (Selenium Grid), which allowed tests to be executed in parallel without environment conflicts.

I also used Docker to deploy test databases and services, ensuring tests were independent of external factors and always ran under the same conditions. This sped up the integration testing process and simplified the setup of CI/CD pipelines.

An example Dockerfile for a test environment with Python and pytest:

FROM python:3.9
WORKDIR /app
COPY requirements.txt ./
RUN pip install -r requirements.txt
COPY . ./
CMD ["pytest", "tests/"]

This approach helps quickly run tests in a container with the necessary dependencies without installing everything locally.