Running tests in containers in Docker - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the main benefit of running tests inside containers?

Running tests inside containers ensures a consistent environment, so tests behave the same way on any machine.

beginner

Which Docker command runs a container and executes tests inside it?

The docker run command starts a container and can execute test commands inside it.

intermediate

How can you share your test code with the container when running tests?

You can use Docker volumes to mount your test code directory into the container so it can access the files.

intermediate

What is a common way to automate running tests in containers during development?

Using a docker-compose.yml file to define services and commands that run tests automatically.

beginner

Why is it important to clean up containers after running tests?

Cleaning up containers frees system resources and avoids clutter, keeping your environment clean and efficient.

Which Docker command runs a container and executes a test script inside it?

A docker run my-image ./run-tests.sh

B docker build my-image ./run-tests.sh

C docker pull my-image ./run-tests.sh

D docker stop my-image ./run-tests.sh

The docker run command starts a container and runs the specified script inside it.

How do you share your local test files with a Docker container?

A Using docker stop command

B Using Docker volumes to mount the local directory

C Using docker pull command

D Using docker commit command

Docker volumes let you mount local directories inside containers so they can access your files.

What file can you use to define multiple containers and test commands together?

A README.md

B Dockerfile

C docker-compose.yml

D package.json

The docker-compose.yml file defines multiple services and commands for containers.

Why should you remove containers after tests finish?

A To free system resources and avoid clutter

B To speed up the tests

C To increase container size

D To change container image

Removing containers after tests keeps your system clean and frees resources.

What is a key advantage of running tests in containers?

A Faster internet speed

B Automatic code writing

C More colorful terminal output

D Consistent environment across machines

Containers provide the same environment everywhere, so tests run reliably.

Explain how you would run a test script inside a Docker container using your local test files.

Think about sharing files and running commands inside containers.

Describe why running tests in containers helps developers and teams.

Consider how containers isolate and standardize environments.