From e793fc206c97a3059c8f396d2205cf5335d17db1 Mon Sep 17 00:00:00 2001
From: Mateusz Grotek <mateusz.grotek@digital.cabinet-office.gov.uk>
Date: Tue, 25 Jun 2024 14:51:33 +0100
Subject: [PATCH] Check ruby test coverage before merging PRs

---
 .github/workflows/ci.yml                      |  4 ++++
 .github/workflows/minitest.yml                |  7 +++++++
 .github/workflows/pact-verify.yml             |  7 +++++++
 .../store-test-coverage-percentage.yml        |  0
 .github/workflows/test-coverage.yml           | 19 +++++++++++++++++++
 test/test_helper.rb                           |  7 +++++++
 6 files changed, 44 insertions(+)
 create mode 100644 .github/workflows/store-test-coverage-percentage.yml
 create mode 100644 .github/workflows/test-coverage.yml

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 08a813b098..51ab6b245e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -61,3 +61,7 @@ jobs:
     uses: ./.github/workflows/pact-verify.yml
     with:
       ref: ${{ github.ref }}
+
+  test-coverage:
+    name: Check test coverage
+    uses: ./.github/workflows/test-coverage.yml
diff --git a/.github/workflows/minitest.yml b/.github/workflows/minitest.yml
index 10e4788fca..fc877d9f66 100644
--- a/.github/workflows/minitest.yml
+++ b/.github/workflows/minitest.yml
@@ -47,3 +47,10 @@ jobs:
           RAILS_ENV: test
           GOVUK_CONTENT_SCHEMAS_PATH: vendor/publishing-api/content_schemas
         run: bundle exec rake test
+
+      - name: Store test coverage percentage
+        uses: actions/upload-artifact@v4
+        with:
+          name: minitest-test-coverage
+          path: coverage/percentage.txt
+          retention-days: 1
diff --git a/.github/workflows/pact-verify.yml b/.github/workflows/pact-verify.yml
index cc36d0c5a6..f941855c82 100644
--- a/.github/workflows/pact-verify.yml
+++ b/.github/workflows/pact-verify.yml
@@ -64,3 +64,10 @@ jobs:
 
       - if: inputs.pact_artifact != ''
         run: bundle exec rake pact:verify:at[tmp/pacts/${{ inputs.pact_artifact_file_to_verify }}]
+
+      - name: Store test coverage percentage
+        uses: actions/upload-artifact@v4
+        with:
+          name: pact-test-coverage
+          path: coverage/percentage.txt
+          retention-days: 1
diff --git a/.github/workflows/store-test-coverage-percentage.yml b/.github/workflows/store-test-coverage-percentage.yml
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/.github/workflows/test-coverage.yml b/.github/workflows/test-coverage.yml
new file mode 100644
index 0000000000..7e34578817
--- /dev/null
+++ b/.github/workflows/test-coverage.yml
@@ -0,0 +1,19 @@
+name: Check test coverage
+
+on:
+  workflow_call:
+
+jobs:
+  name: Check test coverage
+  runs-on: ubuntu-latest
+  steps:
+    - name: Retrieve minitest test coverage
+      uses: actions/download-artifact@v4
+      with:
+        name: minitest-test-overage
+    - name: Retrieve pact test coverage
+      with:
+        name: minitest-test-overage
+    - name: Check Ruby test coverage
+      run: ls -R
+
diff --git a/test/test_helper.rb b/test/test_helper.rb
index fb0ff388a2..9582f1f2f8 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -1,4 +1,11 @@
 require "simplecov"
+SimpleCov.at_exit do
+  SimpleCov.result.format!
+  File.write(
+    Rails.root.join("coverage/percentage.txt"),
+    SimpleCov.result.coverage_statistics[:line].percent.to_s,
+  )
+end
 SimpleCov.start "rails"
 
 require "i18n/coverage"