Add tests and configure CI

Author: WezSieTato

.github/workflows/test.yml

@@ -0,0 +1,25 @@
+name: Tests
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v7
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version: '20'
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run tests
+        run: npm test

.gitignore

@@ -0,0 +1 @@
+node_modules/

content_scripts/pola.js

@@ -1,30 +1,4 @@
 {
-    let validateEAN = function (elem) {
-        if (isNaN(elem)) {
-            return false;
-        }
-        let sum = 0;
-        if (elem.length === 8) {
-            sum = (parseInt(elem[0], 10) + parseInt(elem[2], 10)
-                    + parseInt(elem[4], 10) + parseInt(elem[6], 10))
-                    * 3
-                    + parseInt(elem[1], 10)
-                    + parseInt(elem[3], 10)
-                    + parseInt(elem[5], 10);
-        } else {
-            sum = (parseInt(elem[1], 10) + parseInt(elem[3], 10)
-                    + parseInt(elem[5], 10) + parseInt(elem[7], 10)
-                    + parseInt(elem[9], 10) + parseInt(elem[11], 10))
-                    * 3
-                    + parseInt(elem[0], 10)
-                    + parseInt(elem[2], 10)
-                    + parseInt(elem[4], 10)
-                    + parseInt(elem[6], 10)
-                    + parseInt(elem[8], 10) + parseInt(elem[10], 10);
-        }
-        let num = (10 - (sum % 10)) % 10;
-        return num === parseInt(elem[elem.length - 1], 10);
-    };
     let domain = document.location.hostname || '';
     let result = null;
     let exceptions = {

jest.config.js

@@ -0,0 +1,4 @@
+module.exports = {
+  testEnvironment: 'jsdom',
+  testMatch: ['**/test/**/*.test.js'],
+};

lib/validateEAN.js

@@ -0,0 +1,31 @@
+/**
+ * Validates an EAN-8 or EAN-13 barcode using the check digit algorithm.
+ */
+function validateEAN(elem) {
+    if (isNaN(elem)) {
+        return false;
+    }
+    let sum = 0;
+    if (elem.length === 8) {
+        sum = (parseInt(elem[0], 10) + parseInt(elem[2], 10)
+                + parseInt(elem[4], 10) + parseInt(elem[6], 10))
+                * 3
+                + parseInt(elem[1], 10)
+                + parseInt(elem[3], 10)
+                + parseInt(elem[5], 10);
+    } else {
+        sum = (parseInt(elem[1], 10) + parseInt(elem[3], 10)
+                + parseInt(elem[5], 10) + parseInt(elem[7], 10)
+                + parseInt(elem[9], 10) + parseInt(elem[11], 10))
+                * 3
+                + parseInt(elem[0], 10)
+                + parseInt(elem[2], 10)
+                + parseInt(elem[4], 10)
+                + parseInt(elem[6], 10)
+                + parseInt(elem[8], 10) + parseInt(elem[10], 10);
+    }
+    let num = (10 - (sum % 10)) % 10;
+    return num === parseInt(elem[elem.length - 1], 10);
+}
+
+if (typeof module !== 'undefined') module.exports = { validateEAN };