diff --git a/demo/markdownlint-browser.js b/demo/markdownlint-browser.js
index fb825c4f..b224ec09 100644
--- a/demo/markdownlint-browser.js
+++ b/demo/markdownlint-browser.js
@@ -1479,25 +1479,6 @@ function micromarkParse(markdown) {
   return document;
 }
 
-// /**
-//  * Log the structure of a Micromark token list.
-//  *
-//  * @param {Token[]} tokens Micromark tokens.
-//  * @param {number} depth Tree depth.
-//  * @returns {void}
-//  */
-// function consoleLogTokens(tokens, depth = 0) {
-//   for (const token of tokens) {
-//     const { children, text, type } = token;
-//     console.log(
-//       `${" ".repeat(depth * 2)}${type} ${text.replace(/\n/g, "\\n")}`
-//     );
-//     if (children.length > 0) {
-//       consoleLogTokens(children, depth + 1);
-//     }
-//   }
-// }
-
 /**
  * Filter a list of Micromark tokens by predicate.
  *
diff --git a/helpers/micromark.cjs b/helpers/micromark.cjs
index ebbefad1..3876965e 100644
--- a/helpers/micromark.cjs
+++ b/helpers/micromark.cjs
@@ -100,25 +100,6 @@ function micromarkParse(markdown, options = {}, refsDefined = true) {
   return document;
 }
 
-// /**
-//  * Log the structure of a Micromark token list.
-//  *
-//  * @param {Token[]} tokens Micromark tokens.
-//  * @param {number} depth Tree depth.
-//  * @returns {void}
-//  */
-// function consoleLogTokens(tokens, depth = 0) {
-//   for (const token of tokens) {
-//     const { children, text, type } = token;
-//     console.log(
-//       `${" ".repeat(depth * 2)}${type} ${text.replace(/\n/g, "\\n")}`
-//     );
-//     if (children.length > 0) {
-//       consoleLogTokens(children, depth + 1);
-//     }
-//   }
-// }
-
 /**
  * Filter a list of Micromark tokens by predicate.
  *
diff --git a/test/harness.mjs b/test/harness.mjs
index 3ac30fd2..30ae25d7 100644
--- a/test/harness.mjs
+++ b/test/harness.mjs
@@ -1,8 +1,35 @@
+import { readFile } from "node:fs/promises";
+import { parse } from "../helpers/micromark.cjs";
 import library from "../lib/markdownlint.js";
 const markdownlint = library.promises.markdownlint;
 
-const results = await markdownlint({
-  "files": process.argv.slice(2)
-});
-// eslint-disable-next-line no-console
-console.dir(results, { "depth": null });
+/* eslint-disable no-await-in-loop, no-console */
+
+/**
+ * Log the structure of a Micromark token list.
+ *
+ * @param {Object[]} tokens Micromark tokens.
+ * @param {number} depth Tree depth.
+ * @returns {void}
+ */
+function consoleLogTokens(tokens, depth = 0) {
+  for (const token of tokens) {
+    const { children, text, type } = token;
+    console.log(
+      `${" ".repeat(depth * 2)}${type} ${text.replace(/\n/g, "\\n")}`
+    );
+    if (children.length > 0) {
+      consoleLogTokens(children, depth + 1);
+    }
+  }
+}
+
+const files = process.argv.slice(2);
+for (const file of files) {
+  const content = await readFile(file);
+  consoleLogTokens(parse(content));
+  const results = await markdownlint({
+    "files": [ file ]
+  });
+  console.dir(results, { "depth": null });
+}