test: add unit test for handling mixed line endings in MarkdownParser

Author: Alessio Michelini

test/line-endings.test.ts

@@ -0,0 +1,25 @@
+import { MarkdownParser } from '../src/classes/markdown';
+import { promises as fs } from 'fs';
+import * as path from 'path';
+import { fileURLToPath } from 'url';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+
+describe('Line Endings', () => {
+  const mixedLineEndingsContent = '# Test\n\n## Heading 1\r\n### Heading 2\r';
+  const expectedLinks = [
+    '- [Heading 1](#heading-1)',
+    '  - [Heading 2](#heading-2)',
+  ];
+
+  it('should handle mixed line endings', async () => {
+    const tempDir = await fs.mkdtemp(path.join(__dirname, 'temp-'));
+    const tempFile = path.join(tempDir, 'test.md');
+    await fs.writeFile(tempFile, mixedLineEndingsContent);
+    const parser = new MarkdownParser(tempFile);
+    const links = await parser.parse();
+    expect(links).toEqual(expectedLinks);
+    await fs.rm(tempDir, { recursive: true, force: true });
+  });
+});