Integration test for Rails 5

This is the extra work required to get our simple integration test
running in Rails 5.

It boils down to remove the assumed reliance on Chrome for system tests
that we do not use anyway.

.github/workflows/rails-integration-tests.yml

@@ -7,6 +7,33 @@ on:
       - v2
 
 jobs:
+  rails-5:
+    name: Rails 5 mailer previews
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v4
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      -
+        name: Build and cache
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: ./Dockerfile
+          build-args: |
+            RAILS_VERSION=5.2.8.1
+            MAIL_NOTIFY_BRANCH=${{ github.ref }}
+          push: false
+          load: true
+          tags: mail-notify-integration-rails-6:latest
+          cache-from: type=gha
+          cache-to: type=gha,mode=min
+      -
+        name: Run integration tests
+        run: docker run --rm -e "NOTIFY_API_KEY=${{ secrets.NOTIFY_API_KEY }}" mail-notify-integration-rails-5:latest
   rails-6:
     name: Rails 6 mailer previews
     runs-on: ubuntu-latest

Dockerfile

@@ -27,6 +27,9 @@ WORKDIR mail-notify-integration
 # install the gems into the bundle
 RUN bundle install
 
+# remove gems that will not work in Rails 5
+RUN bundle remove selenium-webdriver chromedriver-helper
+
 # Final stage for app image
 FROM base
 
@@ -49,7 +52,9 @@ RUN echo "gem 'mail-notify', git: 'https://github.com/dxw/mail-notify', branch:
 RUN bundle install
 
 # Copy over intergration test files
-COPY test/ test/
+COPY test/mailers/ test/mailers/
+COPY test/system/ test/system/
+COPY test/application_system_test_case.rb /test/application_system_test_case.rb
 COPY test/app/mailers/ app/mailers/
 COPY test/app/views/ app/views/
 

test/application_system_test_case.rb

@@ -0,0 +1,4 @@
+require "test_helper"
+
+class ApplicationSystemTestCase < ActionDispatch::SystemTestCase
+end