Deis is a distributed system with many moving parts, which makes it of paramount importance to test every change thoroughly.
Deis is also a set of components that correspond to directories in the source code repository. Most components are Docker containers, two are command-line clients, and one contains the documentation. Components have source-code level unit tests and black-box type functional tests. integration tests verify the behavior of the components together as a system.
GitHub pull requests for Deis are tested automatically by a Jenkins continuous integration (CI) system at https://ci.deis.io. Contributors should run the same tests locally before proposing any changes to the Deis codebase.
To run all tests, you will need:
The tests assume that you have Deis’ source code in your
$ go get -u -v github.com/deis/deis $ cd $GOPATH/src/github.com/deis/deis
Deis’ functional tests build Docker images and test them locally. The images are then pushed to a Docker registry so that integration tests can test them as binary artifacts–just as a real-world provisioning of Deis pulls images from the Docker Hub.
If you don’t have a Docker registry already accessible for your testing or for continuous deployment, start one locally.
$ make dev-registry registry To use local registry for Deis development: export DEV_REGISTRY=192.168.59.103:5000
The functional tests also use several mock or example containers: deis/test-etcd, deis/test-postgresql, and deis/mock-store. These are built locally during a test run.
The unit and functional tests for each component are in their respective
directories. The integration tests, scripts, and supporting go packages are in
tests/ directory in the project root.
Scripts in the
tests/bin directory are the best place to start. These test
individual pieces of Deis, then bring up a Vagrant cluster and test all of them
as a system. They call
tests/bin/test-setup.sh to test for important
environment variables and will exit with a helpful message if any are missing.
test-setup.sh script also prepares the testing environment, as well as
tears it down after testing is complete. If there is a test failure, the script
collects verbose component logs, compresses them, and places them in
If s3cmd is installed and configured on the test machine, the script will
instead upload the logs to Amazon S3. This is how the Jenkins CI infrastructure
is configured, so that contributors have access to the logs to see how their
$ ./tests/bin/test-integration.sh >>> Preparing test environment <<< DEIS_ROOT=/Users/matt/Projects/src/github.com/deis/deis DEIS_TEST_APP=example-dockerfile-http ... >>> Running integration suite <<< make -C tests/ test-full ... >>> Test run complete <<<
Run the tests for a single component this way:
$ make -C logger test # unit + functional $ make -C controller test-unit $ make -C router test-functional
tests/bin/test-setup.sh is the best reference to environment
variables that can affect the tests’ behavior. Here are some important ones:
HOST_IPADDR- address on which Docker containers can communicate for the functional tests, probably the host’s IP or the one assigned to Docker Machine.
DEIS_TEST_APP- name of the Deis example app to use, which is cloned from GitHub (default:
DEIS_TEST_AUTH_KEY- SSH key used to register with the Deis controller (default:
DEIS_TEST_SSH_KEY- SSH key used to login to the controller machine (default:
DEIS_TEST_DOMAIN- the domain to use for testing (default: