Add CI Github Action (#31)

* Add CI Action
* Don't attempt to open browser when tests complete.
* Add CI badge to README.

.github/workflows/node.js.yml

@@ -0,0 +1,30 @@
+# This workflow will do a clean installation of node dependencies, cache/restore them, build the source code and run tests across different versions of node
+# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-nodejs
+
+name: Node.js CI
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [18.x, 20.x, 21.x]
+        # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v3
+      with:
+        node-version: ${{ matrix.node-version }}
+        cache: 'npm'
+    - run: yarn install --frozen-lockfile
+    - run: yarn test

README.md

@@ -1,5 +1,7 @@
 # Fernet.js
 
+![ci status](https://github.com/csquared/fernet.js/actions/workflows/node.js.yml/badge.svg?branch=master)
+
 Javascript implementation of <a href="https://github.com/kr/fernet-spec">Fernet symmetric encryption</a>.
 
 Fernet is an opinionated way of using AES and HMAC authentication that makes

package.json

@@ -5,8 +5,7 @@
   "main": "fernet.js",
   "scripts": {
     "pretest": "browserify -s fernet fernet.js > fernetBrowser.js",
-    "test": "mocha",
-    "posttest": "open test.html"
+    "test": "mocha"
   },
   "keywords": [
     "encryption",
@@ -27,4 +26,4 @@
     "sinon": "*",
     "sinon-chai": "*"
   }
-}
+}