Add tests with JSDOM and jest

.github/workflows/ci.yml

@@ -0,0 +1,27 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+  workflow_dispatch: # Allows manual invocation
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@2541b1294d2704b0964813337f33b291d3f8596b # v3.0.2
+
+      - name: Install node
+        uses: actions/setup-node@8c91899e586c5b171469028077307d293428b516 # v3.5.1
+        with:
+          node-version: 18
+
+      - name: Install dependencies
+        run: npm install
+
+      - name: Run Tests
+        run: npm test

.gitignore

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

README.md

@@ -4,6 +4,14 @@ This repository contains code for the recovery component of Turnkey. This self-c
 
 This page is hosted on Github pages at https://tkhq.github.io/recovery/
 
+# Running tests
+
+This HTML page has tests. They run on CI automatically. If you want to run them locally:
+```
+npm install
+npm test
+```
+
 # Running a fake recovery
 
 Download mono, then check out `zeke-recovery-demo`:

babel.config.js

@@ -0,0 +1,7 @@
+module.exports = {
+    presets: [
+      [
+        '@babel/preset-env'
+      ],
+    ],
+  }