Add Github workflows for unit tests.

.github/workflows/ubuntu-latest.yml

@@ -0,0 +1,22 @@
+name: ubuntu-latest CLI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main, v* ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+      - name: Use Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: '12.x'
+      - name: Install dependencies
+        run: npm install
+      - run: npm run test:unit

.github/workflows/windows-latest.yml

@@ -0,0 +1,22 @@
+name: windows-latest CLI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main, v* ]
+
+jobs:
+  build:
+
+    runs-on: windows-latest
+
+    steps:
+      - uses: actions/checkout@v3
+      - name: Use Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: '12.x'
+      - name: Install dependencies
+        run: npm install
+      - run: npm run test:unit

package.json

@@ -8,6 +8,7 @@
     "build": "tsc",
     "dev": "tsc && node dev.js",
     "prepublishOnly": "tsc --outDir dist",
+    "test:unit": "npx nightwatch tests/unit_tests",
     "eslint": "eslint src"
   },
   "author": "",