From d1b01ff61602940ed1efae42aad5fdda89e383a2 Mon Sep 17 00:00:00 2001
From: Colin Rotherham <work@colinr.com>
Date: Thu, 20 Feb 2025 13:14:56 +0000
Subject: [PATCH] Add tests for Sass versions

Inspired by https://github.com/alphagov/govuk-frontend/blob/main/.github/workflows/sass.yaml
---
 .github/workflows/sass.yaml | 63 +++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 .github/workflows/sass.yaml

diff --git a/.github/workflows/sass.yaml b/.github/workflows/sass.yaml
new file mode 100644
index 000000000..688b0332e
--- /dev/null
+++ b/.github/workflows/sass.yaml
@@ -0,0 +1,63 @@
+name: Sass
+
+on: pull_request
+
+jobs:
+  sass:
+    name: Dart Sass ${{ matrix.package-version }}
+    runs-on: ubuntu-22.04
+
+    strategy:
+      fail-fast: false
+
+      matrix:
+        package-version:
+          # Release without major deprecations
+          - 1.77.6
+
+          # Release with `mixed-decls` deprecated
+          - 1.77.7
+
+          # Release with `import` deprecated
+          - 1.80.0
+
+          # Dart Sass latest major version
+          - latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version-file: .nvmrc
+          cache: 'npm'
+
+      - name: Install package
+        run: |
+          npm install -g sass@${{ matrix.package-version }}
+          sass --version
+
+      - name: Check compilation
+        run: |
+          mkdir -p .tmp
+          sass packages/nhsuk.scss > .tmp/check.css
+
+      - name: Check load paths
+        run: |
+          mkdir -p .tmp
+          sh -c 'echo "@import "\""nhsuk"\"";" | sass --stdin --load-path packages > .tmp/check1.css'
+          sh -c 'echo "@use "\""nhsuk"\"" as *;" | sass --stdin --load-path packages > .tmp/check2.css'
+          sh -c 'echo "@forward "\""nhsuk"\"";" | sass --stdin --load-path packages > .tmp/check3.css'
+
+      - name: Check '@use' syntax
+        run: sh -c 'echo "@use "\""nhsuk"\"" as *;" | sass --stdin --load-path packages > /dev/null'
+
+      # Check output for uncompiled Sass
+      - name: Check output
+        run: |
+          ! grep "\$nhsuk-" .tmp/check.css
+          ! grep "\$nhsuk-" .tmp/check1.css
+          ! grep "\$nhsuk-" .tmp/check2.css
+          ! grep "\$nhsuk-" .tmp/check3.css