From c2ec2f5fcf86750337b961403f1eef3f20708562 Mon Sep 17 00:00:00 2001
From: Phillip Johnsen <johphi@gmail.com>
Date: Tue, 22 Oct 2019 18:35:10 +0200
Subject: [PATCH] Add CI test verifying Mustache works with CommonJS

This is a precursor to introducing a build step that will change what
we expose from this package. Better off writing some tests to verify
existing projects with different module systems continue to work as
expected.
---
 .github/workflows/verify.yml         | 19 +++++++++++++++++++
 test/module-systems/.eslintrc        |  6 ++++++
 test/module-systems/commonjs-test.js | 12 ++++++++++++
 3 files changed, 37 insertions(+)
 create mode 100644 test/module-systems/.eslintrc
 create mode 100644 test/module-systems/commonjs-test.js

diff --git a/.github/workflows/verify.yml b/.github/workflows/verify.yml
index 9fdf450..c2a9827 100644
--- a/.github/workflows/verify.yml
+++ b/.github/workflows/verify.yml
@@ -38,3 +38,22 @@ jobs:
         run: |
           npm install mocha@3 chai@3
           npm run test-unit
+
+  common-js-usage:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v1
+      - name: Setup Node.js
+        uses: actions/setup-node@v1
+        with:
+          node-version: 12.x
+      - name: Package, install and test
+        run: |
+          export ARCHIVE_FILENAME=$(npm pack | tail -n 1)
+          export UNPACK_DESTINATION=$(mktemp -d)
+          mv $ARCHIVE_FILENAME $UNPACK_DESTINATION
+          cp test/module-systems/commonjs-test.js $UNPACK_DESTINATION
+          cd $UNPACK_DESTINATION
+          npm install $ARCHIVE_FILENAME
+          node commonjs-test.js
diff --git a/test/module-systems/.eslintrc b/test/module-systems/.eslintrc
new file mode 100644
index 0000000..e16e02c
--- /dev/null
+++ b/test/module-systems/.eslintrc
@@ -0,0 +1,6 @@
+{
+  "extends": "../.eslintrc",
+  "parserOptions": {
+    "ecmaVersion": 2017
+  }
+}
\ No newline at end of file
diff --git a/test/module-systems/commonjs-test.js b/test/module-systems/commonjs-test.js
new file mode 100644
index 0000000..357c569
--- /dev/null
+++ b/test/module-systems/commonjs-test.js
@@ -0,0 +1,12 @@
+const assert = require('assert');
+const mustache = require('mustache');
+
+const view = {
+  title: 'Joe',
+  calc: () => 2 + 4
+};
+
+assert.strictEqual(
+  mustache.render('{{title}} spends {{calc}}', view),
+  'Joe spends 6'
+);