diff --git a/__tests__/helpers.ts b/__tests__/helpers.ts
new file mode 100644
index 0000000..ed5a50d
--- /dev/null
+++ b/__tests__/helpers.ts
@@ -0,0 +1,2 @@
+const parser = require('../dist/lint-md-parser.cjs');
+export const { parseMd, revertMdAstNode, stringifyMdAst } = parser;
diff --git a/__tests__/index.spec.ts b/__tests__/index.spec.ts
index ebd0b8d..6b994a2 100644
--- a/__tests__/index.spec.ts
+++ b/__tests__/index.spec.ts
@@ -1,8 +1,7 @@
 import * as fs from 'fs';
 import * as path from 'path';
 import { execFileSync } from 'child_process';
-
-const { parseMd, revertMdAstNode, stringifyMdAst } = require('../dist/lint-md-parser.cjs');
+import { parseMd, revertMdAstNode, stringifyMdAst } from './helpers';
 
 describe('test lint-md-parser', () => {
   const mdDemo = fs
diff --git a/__tests__/plugins/directive.spec.ts b/__tests__/plugins/directive.spec.ts
index 7fb00af..9f33eda 100644
--- a/__tests__/plugins/directive.spec.ts
+++ b/__tests__/plugins/directive.spec.ts
@@ -1,4 +1,4 @@
-const { parseMd } = require('../../dist/lint-md-parser.cjs');
+import { parseMd } from '../helpers';
 
 describe('remark-directive plugin', () => {
   test('container directive :::note', () => {
diff --git a/__tests__/plugins/gfm.spec.ts b/__tests__/plugins/gfm.spec.ts
new file mode 100644
index 0000000..1916c7f
--- /dev/null
+++ b/__tests__/plugins/gfm.spec.ts
@@ -0,0 +1,79 @@
+import { parseMd } from '../helpers';
+
+describe('remark-gfm plugin', () => {
+  test('table with alignment', () => {
+    const root = parseMd('| a | b |\n|:---|---:|\n| 1 | 2 |');
+    expect(root.children).toHaveLength(1);
+    const node = root.children[0];
+    expect(node.type).toBe('table');
+    if (node.type === 'table') {
+      expect(node.align).toEqual(['left', 'right']);
+      expect(node.children).toHaveLength(2);
+    }
+  });
+
+  test('task list with checked and unchecked items', () => {
+    const root = parseMd('- [x] done\n- [ ] todo');
+    expect(root.children).toHaveLength(1);
+    const list = root.children[0];
+    expect(list.type).toBe('list');
+    if (list.type === 'list') {
+      expect(list.children).toHaveLength(2);
+      expect(list.children[0].type).toBe('listItem');
+      expect(list.children[0].checked).toBe(true);
+      expect(list.children[1].type).toBe('listItem');
+      expect(list.children[1].checked).toBe(false);
+    }
+  });
+
+  test('footnote definition', () => {
+    const root = parseMd('[^1]: note');
+    expect(root.children).toHaveLength(1);
+    const node = root.children[0];
+    expect(node.type).toBe('footnoteDefinition');
+    if (node.type === 'footnoteDefinition') {
+      expect(node.identifier).toBe('1');
+    }
+  });
+
+  test('footnote reference', () => {
+    const root = parseMd('text [^1]\n\n[^1]: note');
+    const paragraph = root.children[0];
+    expect(paragraph.type).toBe('paragraph');
+    if (paragraph.type === 'paragraph') {
+      const ref = paragraph.children.find((child) => child.type === 'footnoteReference');
+      expect(ref).toBeDefined();
+      if (ref?.type === 'footnoteReference') {
+        expect(ref.identifier).toBe('1');
+      }
+    }
+  });
+
+  test('autolink email', () => {
+    const root = parseMd('<contact@example.com>');
+    const paragraph = root.children[0];
+    expect(paragraph.type).toBe('paragraph');
+    if (paragraph.type === 'paragraph') {
+      expect(paragraph.children).toHaveLength(1);
+      const link = paragraph.children[0];
+      expect(link.type).toBe('link');
+      if (link.type === 'link') {
+        expect(link.url).toBe('mailto:contact@example.com');
+      }
+    }
+  });
+
+  test('bare URL in line', () => {
+    const root = parseMd('visit https://example.com');
+    const paragraph = root.children[0];
+    expect(paragraph.type).toBe('paragraph');
+    if (paragraph.type === 'paragraph') {
+      expect(paragraph.children).toHaveLength(2);
+      const link = paragraph.children[1];
+      expect(link.type).toBe('link');
+      if (link.type === 'link') {
+        expect(link.url).toBe('https://example.com');
+      }
+    }
+  });
+});
diff --git a/__tests__/plugins/math.spec.ts b/__tests__/plugins/math.spec.ts
index fa2d32b..a0266e5 100644
--- a/__tests__/plugins/math.spec.ts
+++ b/__tests__/plugins/math.spec.ts
@@ -1,4 +1,4 @@
-const { parseMd } = require('../../dist/lint-md-parser.cjs');
+import { parseMd } from '../helpers';
 
 describe('remark-math plugin', () => {
   test('block math with $$ on separate lines', () => {