Running Terratest in CircleCI

How run Terratest in CircleCI

Running golang test on CircleCI is easy but if you need DIND (docker in docker) that is made by setup_remote_docker is all easy and you have something like this:

version: 2
      - image: circleci/golang:1.13
      TEST_RESULTS: /tmp/test-results
      - checkout
      - setup_remote_docker
      - run: mkdir -p $TEST_RESULTS
      - restore_cache:
            - v1-pkg-cache
      - run: go get
      - run: docker pull appropriate/curl
      - run: cd test && go mod download
      - run:
          name: Run unit tests
          command: |
            make test-unit            
      - run: cp tmp/unit-report.xml /tmp/test-results/unit-report.xml
      - save_cache:
          key: v1-pkg-cache
            - "/go/pkg"
      - store_artifacts:
          path: /tmp/test-results
          destination: raw-test-output
      - store_test_results:
          path: /tmp/test-results

But the issue is the network that is limit for security reasons and this helper will not work in DIND mode.

import http_helper ""
// It can take a few seconds for the Docker container boot up, so retry a few times
maxRetries := 5
timeBetweenRetries := 2 * time.Second
url := fmt.Sprintf("http://localhost:%d", serverPort)

// Setup a TLS configuration to submit with the helper, a blank struct is acceptable
tlsConfig := tls.Config{}

// website::tag::5::Verify that we get back a 200 OK with the expected text
http_helper.HttpGetWithRetry(t, url, &tlsConfig, 200, expectedServerText, maxRetries, timeBetweenRetries)

you need to replace http_helper with docker container with curl:

opts := &docker.RunOptions{
  Command:      []string{"--retry", "5", "--retry-connrefused", "-s", "http://production_nginx:80/hello"},
  OtherOptions: []string{"--network", "testdockercomposelocal_teststack-network"},
tag = "appropriate/curl"
output := docker.Run(t, tag, opts)
assert.Equal(t, expectedServerText, output)

The important thing is to have the same network with docker-compose that I’m using in the application and this container with curl with correct network parameter. Curl have advantage for support an exponential backoff algorithm.

Ladislav Prskavec
Software Engineer and SRE