Testing Deis¶

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.

Set Up the Environment¶

To run all tests, you will need:

Vagrant 1.6.5 or later
VirtualBox 4.3 or later
Docker 1.3.0
PostgreSQL server

The tests assume that you have Deis’ source code in your $GOPATH:

$ go get -u -v github.com/deis/deis
$ cd $GOPATH/src/github.com/deis/deis

Start a Docker Registry¶

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 boot2docker registry for Deis development:
    export DEV_REGISTRY=192.168.59.103:5000

Important

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.

Run the Tests¶

The unit and functional tests for each component are in their respective directories. The integration tests, scripts, and supporting go packages are in the 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.

The 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 $HOME. 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 PR failed.

test-integration.sh¶

runs documentation tests
builds Docker images tagged with $BUILD_TAG
runs unit and functional tests
creates a 3-node Vagrant CoreOS cluster
pushes the Docker images to a registry
provisions the cluster for Deis with the registry images
runs all integration tests
takes roughly an hour

$ ./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 <<<

test-smoke.sh¶

runs documentation tests
builds Docker images tagged with $BUILD_TAG
runs unit and functional tests
creates a 3-node Vagrant CoreOS cluster
pushes the Docker images to a registry
provisions the cluster for Deis with the registry images
runs a “smoke test” that pushes and scales an app
takes roughly 45 minutes

test-latest.sh¶

installs the latest deis and deisctl client releases
creates a 3-node Vagrant CoreOS cluster
provisions the cluster for Deis with latest release images
runs a “smoke test” that pushes and scales an app
takes roughly 30 minutes

Run Specific Tests¶

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

Customize Test Runs¶

The file 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 boot2docker.
DEIS_TEST_APP - name of the Deis example app to use, which is cloned from GitHub (default: example-go)
DEIS_TEST_AUTH_KEY - SSH key used to register with the Deis controller (default: ~/.ssh/deis)
DEIS_TEST_SSH_KEY - SSH key used to login to the controller machine (default: ~/.vagrant.d/insecure_private_key)
DEIS_TEST_DOMAIN - the domain to use for testing (default: local3.deisapp.com)