test: fix unit test cases

package.json

@@ -49,6 +49,7 @@
     "@types/mdast": "^4.0.3",
     "acorn": "^8.11.2",
     "cliui": "npm:@isaacs/cliui@^8.0.2",
+    "mdast-util-frontmatter": "^2.0.1",
     "mdast-util-gfm": "^3.0.0",
     "prettier": "^2.8.8",
     "unified": "^11.0.4",

packages/eslint-plugin-mdx/src/rules/remark.ts

@@ -100,7 +100,7 @@ export const remark: Rule.RuleModule = {
             // related to https://github.com/eslint/eslint/issues/14198
             message: JSON.stringify(message),
             loc:
-              'start' in place
+              /* istanbul ignore next */ 'start' in place
                 ? {
                     ...point,
                     start: { ...place.start, column: place.start.column - 1 },

patches/eslint+8.54.0.patch

@@ -0,0 +1,13 @@
+diff --git a/node_modules/eslint/lib/cli-engine/formatters/stylish.js b/node_modules/eslint/lib/cli-engine/formatters/stylish.js
+index a808448..1d4b79e 100644
+--- a/node_modules/eslint/lib/cli-engine/formatters/stylish.js
++++ b/node_modules/eslint/lib/cli-engine/formatters/stylish.js
+@@ -5,7 +5,7 @@
+ "use strict";
+
+ const chalk = require("chalk"),
+-    stripAnsi = require("strip-ansi"),
++    stripAnsi = require("strip-ansi-cjs"),
+     table = require("text-table");
+
+ //------------------------------------------------------------------------------

patches/string-length+4.0.2.patch

@@ -0,0 +1,11 @@
+diff --git a/node_modules/string-length/index.js b/node_modules/string-length/index.js
+index c2589a2..3040f0a 100644
+--- a/node_modules/string-length/index.js
++++ b/node_modules/string-length/index.js
+@@ -1,5 +1,5 @@
+ 'use strict';
+-const stripAnsi = require('strip-ansi');
++const stripAnsi = require('strip-ansi-cjs');
+ const charRegex = require('char-regex');
+
+ const stringLength = string => {

test/__snapshots__/fixtures.test.ts.snap

@@ -6,62 +6,6 @@ exports[`fixtures lint code blocks should work as expected: code-blocks.md 1`] =
     "column": 1,
     "endColumn": 6,
     "endLine": 3,
-    "fix": {
-      "range": [
-        0,
-        511,
-      ],
-      "text": "# abc
-
-# abc
-
-<div>Hello World!</div>
-
-<!-- eslint-disable unicorn/prefer-spread -->
-
-\`\`\`JavaScript
-export var a = 1 == 2
-
-export const b = [].concat(a)
-\`\`\`
-
-    export var a = 1 == 2
-
-\`\`\`log
-This is not parsable as JavaScript!
-\`\`\`
-
-<!-- eslint-mdx -->
-
-\`\`\`jsx
-export const App = () => <div>2 > 1</div>
-\`\`\`
-
-<!-- eslint-skip -->
-
-\`\`\`TypeScript
-export type Value = 1 | 2 | 3 | 4 | 5
-\`\`\`
-
-\`\`\`MarkDown
-# abc
-
-# abc
-\`\`\`
-
-<!-- mdx -->
-
-\`\`\`mdx
-import React from 'react'
-
-<header>Header</header>
-
-# abc
-
-# abc
-\`\`\`
-",
-    },
     "line": 3,
     "message": "Don’t use multiple top level headings (1:1)",
     "nodeType": "Program",
@@ -1051,62 +995,6 @@ exports[`fixtures should match all snapshots: code-blocks.md 1`] = `
     "column": 1,
     "endColumn": 6,
     "endLine": 3,
-    "fix": {
-      "range": [
-        0,
-        511,
-      ],
-      "text": "# abc
-
-# abc
-
-<div>Hello World!</div>
-
-<!-- eslint-disable unicorn/prefer-spread -->
-
-\`\`\`JavaScript
-export var a = 1 == 2
-
-export const b = [].concat(a)
-\`\`\`
-
-    export var a = 1 == 2
-
-\`\`\`log
-This is not parsable as JavaScript!
-\`\`\`
-
-<!-- eslint-mdx -->
-
-\`\`\`jsx
-export const App = () => <div>2 > 1</div>
-\`\`\`
-
-<!-- eslint-skip -->
-
-\`\`\`TypeScript
-export type Value = 1 | 2 | 3 | 4 | 5
-\`\`\`
-
-\`\`\`MarkDown
-# abc
-
-# abc
-\`\`\`
-
-<!-- mdx -->
-
-\`\`\`mdx
-import React from 'react'
-
-<header>Header</header>
-
-# abc
-
-# abc
-\`\`\`
-",
-    },
     "line": 3,
     "message": "Don’t use multiple top level headings (1:1)",
     "nodeType": "Program",