Add test for worker entry file

backend/tests/worker.test.ts

@@ -0,0 +1,46 @@
+import { expect } from 'chai';
+import { describe, it } from 'mocha';
+import sinon from 'sinon';
+import ffmpeg from 'fluent-ffmpeg';
+
+import { queue, createJob, processJob } from '../src/worker';
+
+describe('createJob', () => {
+  it('should add job to queue', async () => {
+    // Arrange
+    const jobData = {
+      videoId: '123',
+      videoPath: '/path/to/video.mp4',
+      thumbnailPath: '/path/to/thumbnail.jpg',
+    };
+    const addSpy = sinon.spy(queue, 'add');
+
+    // Act
+    await createJob(jobData);
+
+    // Assert
+    expect(addSpy.calledOnce).to.be.true;
+    expect(addSpy.calledWith(jobData)).to.be.true;
+  });
+});
+
+describe('processJob', () => {
+  it('should generate thumbnail', async () => {
+    // Arrange
+    const job = new Job();
+    job.data = {
+      videoId: '123',
+      videoPath: '/path/to/video.mp4',
+      thumbnailPath: '/path/to/thumbnail.jpg',
+    };
+    const screenshotsSpy = sinon.spy(ffmpeg.prototype, 'screenshots');
+    const onSpy = sinon.spy(ffmpeg.prototype, 'on');
+
+    // Act
+    await processJob(job);
+
+    // Assert
+    expect(screenshotsSpy.calledOnce).to.be.true;
+    expect(onSpy.calledWith('end')).to.be.true;
+  });
+});