Chore: Add tests

__tests__/addHeadingIds.integration.test.js

@@ -0,0 +1,14 @@
+import { processMarkdown } from '../dist/index.js';
+
+describe('addHeadingIds with actual Markdown', () => {
+  it('should add IDs to headings in Markdown content', async () => {
+    const markdown = `# First Heading\n## Second Heading`;
+    const options = { addHeadingIds: true };
+
+    const result = await processMarkdown(markdown, options);
+    const htmlOutput = result.contentHtml;
+
+    expect(htmlOutput).toContain('<h1 id="first-heading">First Heading</h1>');
+    expect(htmlOutput).toContain('<h2 id="second-heading">Second Heading</h2>');
+  });
+});

__tests__/addHeadingIds.test.js

@@ -0,0 +1,112 @@
+import addHeadingIds from '../src/plugins/addHeadingIds';
+
+describe('addHeadingIds', () => {
+  beforeEach(() => {
+    jest.clearAllMocks();
+    addHeadingIds()(mockTree);
+  });
+
+  const mockTree = {
+    type: 'root',
+    children: [
+      {
+        type: 'element',
+        tagName: 'h1',
+        children: [{ type: 'text', value: 'First Heading' }],
+        properties: {},
+      },
+      {
+        type: 'element',
+        tagName: 'h2',
+        children: [{ type: 'text', value: 'Second Heading' }],
+        properties: {},
+      },
+      {
+        type: 'element',
+        tagName: 'p',
+        children: [{ type: 'text', value: 'The first paragraph, with some text.' }],
+        properties: {},
+      },
+      {
+        type: 'element',
+        tagName: 'h3',
+        children: [{ type: 'text', value: 'Third Heading' }],
+        properties: {},
+      },
+      {
+        type: 'element',
+        tagName: 'p',
+        children: [{ type: 'text', value: 'Another paragraph, with a little bit more text.' }],
+        properties: {},
+      },
+      {
+        type: 'element',
+        tagName: 'h4',
+        children: [{ type: 'text', value: 'Fourth Heading' }],
+        properties: {},
+      },
+      {
+        type: 'element',
+        tagName: 'p',
+        children: [{ type: 'text', value: 'The third paragraph.' }],
+        properties: {},
+      },
+      {
+        type: 'element',
+        tagName: 'h5',
+        children: [{ type: 'text', value: 'Fifth Heading' }],
+        properties: {},
+      },
+      {
+        type: 'element',
+        tagName: 'p',
+        children: [{ type: 'text', value: 'A short paragraph.' }],
+        properties: {},
+      },
+      {
+        type: 'element',
+        tagName: 'h6',
+        children: [{ type: 'text', value: 'Sixth Heading' }],
+        properties: {},
+      },
+      {
+        type: 'element',
+        tagName: 'p',
+        children: [{ type: 'text', value: 'Another short paragraph.' }],
+        properties: {},
+      },
+    ],
+  };
+
+  it('should add IDs to h1 elements', () => {
+    expect(mockTree.children[0].properties.id).toBe('first-heading');
+  });
+
+  it('should add IDs to h2 elements', () => {
+    expect(mockTree.children[1].properties.id).toBe('second-heading');
+  });
+
+  it('should add IDs to h3 elements', () => {
+    expect(mockTree.children[3].properties.id).toBe('third-heading');
+  });
+
+  it('should add IDs to h4 elements', () => {
+    expect(mockTree.children[5].properties.id).toBe('fourth-heading');
+  });
+
+  it('should add IDs to h5 elements', () => {
+    expect(mockTree.children[7].properties.id).toBe('fifth-heading');
+  });
+
+  it('should add IDs to h6 elements', () => {
+    expect(mockTree.children[9].properties.id).toBe('sixth-heading');
+  });
+
+  it('should not add IDs to non-heading elements', () => {
+    expect(mockTree.children[2].properties.id).toBe(undefined);
+    expect(mockTree.children[4].properties.id).toBe(undefined);
+    expect(mockTree.children[6].properties.id).toBe(undefined);
+    expect(mockTree.children[8].properties.id).toBe(undefined);
+    expect(mockTree.children[10].properties.id).toBe(undefined);
+  });
+});