Estimated Reading Time: 3 mins
The source for the tutorial is available on Github as codeship/ci-guide and you can clone it via
git clone firstname.lastname@example.org:codeship/ci-guide.git
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.
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.
So, first we’re going to…
Opening up our
codeship-services.yml, we’ll add the following:
demo: build: image: myapp dockerfile: Dockerfile links: - redis - postgres environment: TEST_TOKEN: Testing123
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.
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.
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.
Now, after configuring your tests, let’s go back to your terminal and run
This will run your CI process as defined in
You should see something like this indicating our tests ran and passed:
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.