diff --git a/bun.lockb b/bun.lockb
index e13f334e..d29abf63 100755
Binary files a/bun.lockb and b/bun.lockb differ
diff --git a/packages/nuemark/package.json b/packages/nuemark/package.json
index 419b1d72..c63386ff 100644
--- a/packages/nuemark/package.json
+++ b/packages/nuemark/package.json
@@ -18,6 +18,9 @@
     "js-yaml": "^4.1.0",
     "nue-glow": "*"
   },
+  "devDependencies": {
+    "commonmark-spec": "^0.31.2"
+  },
   "jest": {
     "setupFilesAfterEnv": [
       "jest-extended/all",
diff --git a/packages/nuemark/test/cmark.test.js b/packages/nuemark/test/cmark.test.js
new file mode 100644
index 00000000..fb245b2a
--- /dev/null
+++ b/packages/nuemark/test/cmark.test.js
@@ -0,0 +1,20 @@
+import { tests } from 'commonmark-spec'
+import { nuemark } from '../index.js'
+
+tests.forEach(v => {
+    v.markdown = v.markdown.replaceAll('→', '\t').trimEnd()
+    v.html = v.html.replaceAll('→', '\t').trimEnd()
+})
+
+const skipSections = ['Tabs', 'Indented code blocks', 'Raw HTML', 'HTML blocks']
+const skipNumbers = []
+
+for (const testCase of tests) {
+    if (skipSections.includes(testCase.section) ||
+        skipNumbers.includes(testCase.number)) continue
+
+    test(`cmark spec: ${testCase.section}; ${testCase.number}`, () => {
+        console.log(testCase.number, JSON.stringify(testCase.markdown))
+        expect(nuemark(testCase.markdown)).toEqual(testCase.html)
+    })
+}