diff --git a/.github/workflows/wled-ci.yml b/.github/workflows/wled-ci.yml
index 7d27717dd..c38ab7d1e 100644
--- a/.github/workflows/wled-ci.yml
+++ b/.github/workflows/wled-ci.yml
@@ -94,3 +94,16 @@ jobs:
           *.bin
       env:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+
+  Test-cdata:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Use Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: '20.x'
+          cache: 'npm'
+      - run: npm ci
+      - run: npm test
\ No newline at end of file
diff --git a/package.json b/package.json
index 7394ecad4..f490f7635 100644
--- a/package.json
+++ b/package.json
@@ -9,6 +9,7 @@
   },
   "scripts": {
     "build": "node tools/cdata.js",
+    "test": "node --test",
     "dev": "nodemon -e js,html,htm,css,png,jpg,gif,ico,js -w tools/ -w wled00/data/ -x node tools/cdata.js"
   },
   "repository": {
diff --git a/tools/cdata-test.js b/tools/cdata-test.js
index 81a8d8142..4fb8ba7e8 100644
--- a/tools/cdata-test.js
+++ b/tools/cdata-test.js
@@ -1,75 +1,100 @@
+'use strict';
 const assert = require('node:assert');
-const { describe, it, before, after, mock, test } = require('node:test');
+const { describe, it, before, after, afterEach, mock, test, run } = require('node:test');
 const fs = require('fs');
 const path = require('path');
+const child_process = require('child_process');
+const util = require('util');
+const execPromise = util.promisify(child_process.exec);
+
+process.env.NODE_ENV = 'test'; // Set the environment to testing
 const cdata = require('./cdata.js');
 
-describe('Caching', function () {
-  describe('isFileNewerThan', function () {
-    before(function () {
-      // Create a temporary file before the test
-      fs.writeFileSync('temp.txt', 'Hello World');
-    });
+describe('Caching', () => {
+  const testFolderPath = path.join(__dirname, 'testFolder');
+  const oldFilePath = path.join(testFolderPath, 'oldFile.txt');
+  const newFilePath = path.join(testFolderPath, 'newFile.txt');
 
-    it('should return true if the file is newer than the provided time', function () {
+  // Create a temporary file before the test
+  before(() => {
+    fs.writeFileSync('temp.txt', 'Hello World');
+
+    // Create test folder
+    if (!fs.existsSync(testFolderPath)) {
+      fs.mkdirSync(testFolderPath);
+    }
+
+    // Create an old file
+    fs.writeFileSync(oldFilePath, 'This is an old file.');
+    // Modify the 'mtime' to simulate an old file
+    const oldTime = new Date();
+    oldTime.setFullYear(oldTime.getFullYear() - 1);
+    fs.utimesSync(oldFilePath, oldTime, oldTime);
+
+    // Create a new file
+    fs.writeFileSync(newFilePath, 'This is a new file.');
+  });
+  // delete the temporary file after the test
+  after(() => {
+    fs.unlinkSync('temp.txt');
+
+    // Delete test folder
+    if (fs.existsSync(testFolderPath)) {
+      fs.rmSync(testFolderPath, { recursive: true });
+    }
+  });
+
+  describe('isFileNewerThan', async () => {
+    it('should return true if the file is newer than the provided time', async () => {
       const pastTime = Date.now() - 10000; // 10 seconds ago
-      assert.equal(cdata.isFileNewerThan('temp.txt', pastTime), true);
+      assert.strictEqual(cdata.isFileNewerThan('temp.txt', pastTime), true);
     });
 
-    it('should return false if the file is older than the provided time', function () {
+    it('should return false if the file is older than the provided time', async () => {
       const futureTime = Date.now() + 10000; // 10 seconds in the future
-      assert.equal(cdata.isFileNewerThan('temp.txt', futureTime), false);
+      assert.strictEqual(cdata.isFileNewerThan('temp.txt', futureTime), false);
     });
 
-    it('should return false if the file does not exist', function () {
-      assert.equal(cdata.isFileNewerThan('nonexistent.txt', Date.now()), false);
-    });
-
-    // delete the temporary file after the test
-    after(function () {
-      fs.unlinkSync('temp.txt');
+    it('should return false if the file does not exist', async () => {
+      assert.strictEqual(cdata.isFileNewerThan('nonexistent.txt', Date.now()), false);
     });
   });
 
-  describe('isAnyFileInFolderNewerThan', function () {
-    const testFolderPath = path.join(__dirname, 'testFolder');
-    const oldFilePath = path.join(testFolderPath, 'oldFile.txt');
-    const newFilePath = path.join(testFolderPath, 'newFile.txt');
-
-    before(function () {
-      // Create test folder
-      if (!fs.existsSync(testFolderPath)) {
-        fs.mkdirSync(testFolderPath);
-      }
-
-      // Create an old file
-      fs.writeFileSync(oldFilePath, 'This is an old file.');
-      // Modify the 'mtime' to simulate an old file
-      const oldTime = new Date();
-      oldTime.setFullYear(oldTime.getFullYear() - 1);
-      fs.utimesSync(oldFilePath, oldTime, oldTime);
-
-      // Create a new file
-      fs.writeFileSync(newFilePath, 'This is a new file.');
-    });
-
-    it('should return true if a file in the folder is newer than the given time', function () {
+  describe('isAnyFileInFolderNewerThan', async () => {
+    it('should return true if a file in the folder is newer than the given time', async () => {
       const folderPath = path.join(__dirname, 'testFolder');
       const time = fs.statSync(path.join(folderPath, 'oldFile.txt')).mtime;
       assert.strictEqual(cdata.isAnyFileInFolderNewerThan(folderPath, time), true);
     });
 
-    it('should return false if no files in the folder are newer than the given time', function () {
+    it('should return false if no files in the folder are newer than the given time', async () => {
       const folderPath = path.join(__dirname, 'testFolder');
       const time = new Date();
       assert.strictEqual(cdata.isAnyFileInFolderNewerThan(folderPath, time), false);
     });
+  });
+});
 
-    after(function () {
-      // Delete test folder
-      if (fs.existsSync(testFolderPath)) {
-        fs.rmSync(testFolderPath, { recursive: true });
-      }
+describe('General functionality', () => {
+  describe('Script', () => {
+    it('should create html_*.h files if they are missing', async () => {
+      // delete all html_*.h files
+      const folderPath = 'wled00';
+      let files = await fs.promises.readdir(folderPath);
+      await Promise.all(files.map(file => {
+        if (file.startsWith('html_') && path.extname(file) === '.h') {
+          return fs.promises.unlink(path.join(folderPath, file));
+        }
+      }));
+
+      // run script cdata.js and wait for it to finish
+      process.env.NODE_ENV = 'production';
+      await execPromise('node tools/cdata.js');
+
+      // check if html_*.h files were created
+      files = await fs.promises.readdir(folderPath);
+      const htmlFiles = files.filter(file => file.startsWith('html_') && path.extname(file) === '.h');
+      assert(htmlFiles.length > 0, 'html_*.h files were not created');
     });
   });
 });
\ No newline at end of file
diff --git a/tools/cdata.js b/tools/cdata.js
index afe6d9bd0..76eb322c7 100644
--- a/tools/cdata.js
+++ b/tools/cdata.js
@@ -233,6 +233,7 @@ function isAnyFileInFolderNewerThan(folderPath, time) {
   return false;
 }
 
+// Check if the web UI is already built
 function isAlreadyBuilt(folderPath) {
   let lastBuildTime = Infinity;
 
@@ -248,6 +249,11 @@ function isAlreadyBuilt(folderPath) {
   return !isAnyFileInFolderNewerThan(folderPath, lastBuildTime);
 }
 
+// Don't run this script if we're in a test environment
+if (process.env.NODE_ENV === 'test') {
+  return;
+}
+
 if (isAlreadyBuilt("wled00/data") && process.argv[2] !== '--force' && process.argv[2] !== '-f') {
   console.info("Web UI is already built");
   return;