CodeShip Pro Introduction Guide Part 2

• Getting Started With CodeShip Pro (Part 2)
• Running tests
  • Creating an environment variable
  • Writing a test to look for the variable
  • Updating steps to run in parallel
  • Running the tests locally
• Next: Pushing images and deploying

The source for the tutorial is available on Github as codeship/ci-guide and you can clone it via

git clone git@github.com:codeship/ci-guide.git

Getting Started With CodeShip Pro (Part 2)

One of the most essential parts of any CI process is running your tests. With CodeShip Pro, we wanted to make building your CI/CD pipeline easy, so we made debugging and troubleshooting - both locally and remotely - as straightforward as we could.

Running tests

Let’s go back in to our code example for a minute and add a simple test.

In our case, we’re just going to check for an existent environmental variable. This isn’t a particularly real-world scenario, but it will help demonstrate exactly what CodeShip does with your tests and what you should look for.

Creating an environment variable

Opening up our codeship-services.yml, we’ll add the following:

demo:
  build:
    image: myapp
    dockerfile: Dockerfile
  depends_on:
    - redis
    - postgres
  environment:
    TEST_TOKEN: Testing123

This new environment directive creates a new environment variable in our build named TEST_TOKEN. Note that even though we’re explicitly declaring our environment variables here, in a production application we’d actual prefer to encrypt them.

Writing a test to look for the variable

With our environment variable set, let’s write a test to look for it.

Create a new file called test.rb and open up it. In our new file, we’ll write:

if ENV['TEST_TOKEN'].nil?
   puts "Our Variable Is Not Working"
   exit 1
else
   puts "Our Variable Is Working"
   exit 0
 end

What we’re doing here is checking to see if our new environment variable is nil. If it is, we have a problem and we exit with a status code 1 to let the CI/CD process know we have an error. If it’s not nil, we’re in business and we exit with a status code 0 to indicate a success.

Updating steps to run in parallel

Now that we have a working test script, we need to run it. Let’s open up our codeship-steps.yml file and modify it to the following:

- type: parallel
  steps:
    - name: checkrb
      service: demo
      command: bundle exec ruby check.rb
    - name: test
      service: demo
      command: bundle exec ruby test.rb

As you can see we’re now running our two scripts under a new parallel modifier. This means they will run side-by-side on separate containers, letting us move through multiple steps in our pipeline more quickly.

Running the tests locally

Now, after configuring your tests, let’s go back to your terminal and run jet steps

This will run your CI process as defined in codeship-steps.yml.

You should see something like this indicating our tests ran and passed:

Next: Pushing images and deploying

So, now we have images building, a working script and a working test! The next step is to move from CI to CD: pushing images and deploying your code.