Use GOV.UK Docker to test GOV.UK Docker

.github/workflows/ci.yml

@@ -11,4 +11,4 @@ jobs:
         key: bundle-${{ hashFiles('**/Gemfile.lock') }}
         restore-keys: bundle
     - run: bundle install --jobs 4 --retry 3 --deployment
-    - run: GOVUK_DOCKER_DIR=. make lint test
+    - run: GOVUK_DOCKER_DIR=. make test-ci

Brewfile

@@ -1,5 +1,4 @@
 brew "dnsmasq"
-brew "rbenv"
 brew "pv"
 brew "shellcheck"
 

CONTRIBUTING.md

@@ -4,20 +4,22 @@ Contributions welcome - just raise a PR and make sure the tests pass!
 
 ## Testing
 
-**First make sure you have the following dependencies.**
+GOV.UK Docker tests are written in Ruby / RSpec. Just like any other Ruby project, we have a `govuk-docker-lite` stack for running the tests, using GOV.UK Docker.
 
-- [rbenv](https://github.com/rbenv/rbenv#installation)
-
-**Next install Ruby / dependencies and run all the tests.**
+Do this the first time you run the tests:
 
 ```sh
-rbenv install
+make govuk-docker
+```
 
-bundle install
+Do this to run the tests for GOV.UK Docker:
 
-make test
+```sh
+make test-local
 ```
 
+This will also run checks on scripts and config files in this repo. Since these checks require access to your local machine, they are not run using GOV.UK Docker.
+
 ## Versioning
 
 GOV.UK Docker is [versioned][version] in order to notify users about important changes, where they may need to take action. Since we use the repo itself for distributing GOV.UK Docker, for many PRs it's unlikely you will need to change the version.

Makefile

@@ -13,14 +13,15 @@ default:
 	@echo "For example:"
 	@echo "    make content-publisher"
 
-lint:
-	# Lint the ruby code
-	bundle exec rubocop
+test-local: test-scripts
+	$(GOVUK_DOCKER) run govuk-docker-lite bundle exec rubocop
+	$(GOVUK_DOCKER) run govuk-docker-lite bundle exec rspec
 
-test:
-	# Run the tests for the govuk-docker CLI
+test-ci: test-scripts
+	bundle exec rubocop
 	bundle exec rspec
 
+test-scripts:
 	# Test that the docker-compose config is valid. This will error if there are errors
 	# in the YAML files, or incompatible features are used.
 	$(GOVUK_DOCKER) config > /dev/null

README.md

@@ -33,7 +33,6 @@ Run `echo $SHELL` if you're not sure which shell you use. After saving, you will
 ```
 git clone [email protected]:alphagov/govuk-docker.git
 cd govuk-docker
-bundle install
 bin/setup
 ```
 

docs/troubleshooting.md

@@ -15,12 +15,27 @@ ssh_username: "yourname"
 
 ## Diagnose common issues when setting up GOV.UK Docker
 
-Run the following command in `~/govuk/govuk-docker`. Since this script makes use of Ruby Gems, you will need to [install some additional dependencies](../CONTRIBUTING.md#testing) in order to do this.
+Run the following command in `~/govuk/govuk-docker`.
 
 ```
 bin/doctor
 ```
 
+Since this script makes use of Ruby Gems, you will need to install some additional dependencies in order to do this.
+
+
+First make sure you have the following dependencies:
+
+- [rbenv](https://github.com/rbenv/rbenv#installation)
+
+Next install Ruby / dependencies and run all the tests:
+
+```sh
+rbenv install
+
+bundle install
+```
+
 ## Diagnose database issues with a project/app not making
 
 If you run `make` on an app inside govuk-docker and face any of the following database issues:

projects/generic-ruby-library/Makefile

@@ -3,3 +3,4 @@ govspeak: bundle-govspeak
 govuk_app_config: bundle-govuk_app_config
 plek: bundle-plek
 smokey: bundle-smokey
+govuk-docker: bundle-govuk-docker

projects/generic-ruby-library/docker-compose.yml

@@ -22,6 +22,10 @@ services:
     <<: *generic-ruby-library
     working_dir: /govuk/govuk_app_config
 
+  govuk-docker-lite:
+    <<: *generic-ruby-library
+    working_dir: /govuk/govuk-docker
+
   plek-lite:
     <<: *generic-ruby-library
     working_dir: /govuk/plek