test: add test cases for metadata adapters

test/utils/generateUniqueFileName.test.js

@@ -0,0 +1,55 @@
+import { expect } from 'chai';
+import sinon from 'sinon';
+import fs from 'fs/promises';
+import path from "path";
+import generateUniqueFilename from '../../src/utils/generateUniqueFilename.js';
+
+describe('generateUniqueFilename', () => {
+  let statStub;
+
+  beforeEach(() => {
+    // Stub fs.stat to control its behavior during test
+    statStub = sinon.stub(fs, 'stat');
+  });
+
+  afterEach(() => {
+    // Restore fs.stat to its original state
+    statStub.restore();
+  });
+
+  it('should return the original filename when conflict does not exist', async () => {
+    const directory = 'music';
+    const originalFilename = 'song.mp3';
+
+    // Configure the stub to simulate that the file does not exist
+    statStub.rejects(new Error('File not found'));
+
+    const uniqueFilename = await generateUniqueFilename(directory, originalFilename);
+
+    // Validate that the filename is unchanged
+    const unchangedPattern = /^music[\\/][^\\/]+\.\w+$/; // Adjusted to ensure correct path matching
+    expect(uniqueFilename).to.match(unchangedPattern);
+  });
+
+  it('should generate a unique filename when conflict exists', async () => {
+    const directory = 'music';
+    const originalFilename = 'song.mp3';
+
+    const existingFiles = [
+      path.join(directory, 'song.mp3'),
+      path.join(directory, 'song (1).mp3'),
+    ];
+
+    statStub.callsFake((filePath) => {
+      if (existingFiles.includes(filePath)) {
+        return Promise.resolve({});
+      }
+      return Promise.reject(new Error('File not found'));
+    });
+
+    const uniqueFilename = await generateUniqueFilename(directory, originalFilename);
+
+    const changedPattern = /^music[\\/][^\\/]+\s\(\d+\)\.\w+$/;
+    expect(uniqueFilename).to.match(changedPattern);
+  });
+});