diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 0000000..60542f0
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,45 @@
+---
+name: Unit Tests
+
+on:
+  push:
+    branches: [main, master]
+  pull_request:
+    branches: [main, master]
+  workflow_dispatch: true
+
+jobs:
+  test:
+    name: Test on Node.js ${{ matrix.node-version }}
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+
+    strategy:
+      matrix:
+        node-version: [18, 20, 22, latest]
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run tests
+        run: npm test
+
+      - name: Upload test output as artifact
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: test-output-node-${{ matrix.node-version }}
+          path: test-output.json
+          if-no-files-found: ignore
+          retention-days: 7
diff --git a/test-benchmark.json b/test-benchmark.json
new file mode 100644
index 0000000..8cb41db
--- /dev/null
+++ b/test-benchmark.json
@@ -0,0 +1,40 @@
+{
+  "metadata": {
+    "generated": "2024-01-01T00:00:00.000Z",
+    "source": "https://www.itu.int/pub/T-SP-E.212B-202401-I/en",
+    "etag": "\"benchmark\""
+  },
+  "areas": {
+    "united states": [
+      {
+        "name": "Verizon Wireless",
+        "mcc": "310",
+        "mnc": "004"
+      },
+      {
+        "name": "AT&T Mobility",
+        "mcc": "310",
+        "mnc": "410"
+      }
+    ],
+    "canada": [
+      {
+        "name": "Rogers Wireless",
+        "mcc": "302",
+        "mnc": "720"
+      }
+    ],
+    "united kingdom": [
+      {
+        "name": "Vodafone",
+        "mcc": "234",
+        "mnc": "015"
+      }
+    ]
+  },
+  "areaNames": [
+    "United States",
+    "Canada",
+    "United Kingdom"
+  ]
+}
diff --git a/test.mjs b/test.mjs
index eafc5b3..d30add4 100644
--- a/test.mjs
+++ b/test.mjs
@@ -3,18 +3,19 @@ import assert from 'node:assert/strict';
 import fs from 'fs/promises';
 import path from 'path';
 import { fileURLToPath } from 'url';
+import { spawnSync } from 'child_process';
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
 const testOutputPath = path.join(__dirname, 'test-output.json');
+const benchmarkPath = path.join(__dirname, 'test-benchmark.json');
 
-test('MCC/MNC tool', async (t) => {
+test('MCC/MNC tool - structure validation', async (t) => {
   // Cleanup from previous runs
   try {
     await fs.unlink(testOutputPath);
   } catch {}
 
   // Run script
-  const { spawnSync } = await import('child_process');
   const result = spawnSync('node', ['index.mjs', '--output', testOutputPath], {
     stdio: 'inherit'
   });
@@ -32,6 +33,65 @@ test('MCC/MNC tool', async (t) => {
   assert.ok(Array.isArray(data.areaNames), 'Should have areaNames array');
   assert.ok(Object.keys(data.areas).length > 0, 'Should have at least one area');
 
+  // Cleanup
+  await fs.unlink(testOutputPath);
+});
+
+test('MCC/MNC tool - content validation', async (t) => {
+  // Cleanup from previous runs
+  try {
+    await fs.unlink(testOutputPath);
+  } catch {}
+
+  // Run script
+  const result = spawnSync('node', ['index.mjs', '--output', testOutputPath], {
+    stdio: 'inherit'
+  });
+  
+  assert.strictEqual(result.status, 0, 'Script should exit with code 0');
+
+  // Load actual and benchmark data
+  const actualContent = await fs.readFile(testOutputPath, 'utf-8');
+  const actual = JSON.parse(actualContent);
+  
+  const benchmarkContent = await fs.readFile(benchmarkPath, 'utf-8');
+  const benchmark = JSON.parse(benchmarkContent);
+
+  // Validate structure matches benchmark
+  assert.ok(actual.metadata, 'Should have metadata object');
+  assert.ok(actual.areas, 'Should have areas object');
+  assert.ok(actual.areaNames, 'Should have areaNames array');
+
+  // Validate all area names are strings
+  assert.ok(actual.areaNames.every(name => typeof name === 'string'), 'All area names should be strings');
+
+  // Validate areas structure
+  for (const [areaKey, entries] of Object.entries(actual.areas)) {
+    assert.ok(Array.isArray(entries), `Area "${areaKey}" should be an array`);
+    for (const entry of entries) {
+      assert.strictEqual(typeof entry.name, 'string', `Entry name should be string in area "${areaKey}"`);
+      assert.strictEqual(typeof entry.mcc, 'string', `Entry mcc should be string in area "${areaKey}"`);
+      assert.strictEqual(typeof entry.mnc, 'string', `Entry mnc should be string in area "${areaKey}"`);
+      assert.ok(entry.name.length > 0, `Entry name should not be empty in area "${areaKey}"`);
+      assert.ok(entry.mcc.length > 0, `Entry mcc should not be empty in area "${areaKey}"`);
+      assert.ok(entry.mnc.length > 0, `Entry mnc should not be empty in area "${areaKey}"`);
+    }
+  }
+
+  // Validate that we have a reasonable number of areas (at least as many as benchmark)
+  assert.ok(
+    Object.keys(actual.areas).length >= Object.keys(benchmark.areas).length,
+    `Should have at least ${Object.keys(benchmark.areas).length} areas`
+  );
+
+  // Validate that we have a reasonable number of entries
+  const actualEntriesCount = Object.values(actual.areas).flat().length;
+  const benchmarkEntriesCount = Object.values(benchmark.areas).flat().length;
+  assert.ok(
+    actualEntriesCount >= benchmarkEntriesCount,
+    `Should have at least ${benchmarkEntriesCount} entries, got ${actualEntriesCount}`
+  );
+
   // Cleanup
   await fs.unlink(testOutputPath);
 });
\ No newline at end of file