diff --git a/.github/workflows/eslint-rules.yml b/.github/workflows/eslint-rules.yml
new file mode 100644
index 000000000..75b183a46
--- /dev/null
+++ b/.github/workflows/eslint-rules.yml
@@ -0,0 +1,28 @@
+name: Internal_ESLint_Rules_Test
+
+on:
+  push:
+    paths:
+      - "scripts/tools/eslint-plugin-prettier-internal-rules"
+      - ".github/workflows/eslint-rules.yml"
+  pull_request:
+    paths:
+      - "scripts/tools/eslint-plugin-prettier-internal-rules"
+      - ".github/workflows/eslint-rules.yml"
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2.3.4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v2.1.4
+
+      - name: Install Dependencies
+        run: yarn install --frozen-lockfile
+
+      - name: Test
+        run: cd scripts/tools/eslint-plugin-prettier-internal-rules && yarn test-coverage
diff --git a/.gitignore b/.gitignore
index 1a0eb682a..cdee460be 100644
--- a/.gitignore
+++ b/.gitignore
@@ -21,3 +21,5 @@ package-lock.json
 !.yarn/sdks
 !.yarn/versions
 .pnp.*
+.nyc_output
+/scripts/tools/eslint-plugin-prettier-internal-rules/node_modules
diff --git a/scripts/tools/eslint-plugin-prettier-internal-rules/better-parent-property-check-in-needs-parens.js b/scripts/tools/eslint-plugin-prettier-internal-rules/better-parent-property-check-in-needs-parens.js
index 44032e57f..0346e4212 100644
--- a/scripts/tools/eslint-plugin-prettier-internal-rules/better-parent-property-check-in-needs-parens.js
+++ b/scripts/tools/eslint-plugin-prettier-internal-rules/better-parent-property-check-in-needs-parens.js
@@ -53,7 +53,7 @@ module.exports = {
     },
     messages: {
       [MESSAGE_ID_PREFER_NAME_CHECK]:
-        "Prefer `name {{operator}}　{{property}}` over `parent.{{property}} {{operator}} node`",
+        "Prefer `name {{operator}} {{propertyText}}` over `parent.{{property}} {{operator}} node`.",
       [MESSAGE_ID_NAME_CHECK_FIRST]:
         "`name` comparison should be on left side.",
     },
@@ -79,7 +79,11 @@ module.exports = {
         context.report({
           node,
           messageId: MESSAGE_ID_PREFER_NAME_CHECK,
-          data: { property: propertyText, operator },
+          data: {
+            property: sourceCode.getText(property),
+            propertyText,
+            operator,
+          },
           fix: (fixer) =>
             fixer.replaceText(node, `name ${operator} ${propertyText}`),
         });
diff --git a/scripts/tools/eslint-plugin-prettier-internal-rules/no-node-comments.js b/scripts/tools/eslint-plugin-prettier-internal-rules/no-node-comments.js
index 761911b0e..493549b52 100644
--- a/scripts/tools/eslint-plugin-prettier-internal-rules/no-node-comments.js
+++ b/scripts/tools/eslint-plugin-prettier-internal-rules/no-node-comments.js
@@ -50,8 +50,14 @@ module.exports = {
         ];
       })
     );
+    // avoid report on `const {comments} = node` twice
+    const reported = new Set();
     return {
       [selector](node) {
+        if (reported.has(node)) {
+          return;
+        }
+
         if (ignored.has(fileName)) {
           const functionNames = ignored.get(fileName);
           if (functionNames === true) {
@@ -75,6 +81,7 @@ module.exports = {
             return;
           }
         }
+        reported.add(node);
         context.report({
           node,
           messageId,
diff --git a/scripts/tools/eslint-plugin-prettier-internal-rules/package.json b/scripts/tools/eslint-plugin-prettier-internal-rules/package.json
index 6815d7966..aaee2c7dc 100644
--- a/scripts/tools/eslint-plugin-prettier-internal-rules/package.json
+++ b/scripts/tools/eslint-plugin-prettier-internal-rules/package.json
@@ -5,5 +5,9 @@
   "private": true,
   "author": "fisker",
   "main": "./index.js",
-  "license": "MIT"
+  "license": "MIT",
+  "scripts": {
+    "test": "node test.js",
+    "test-coverage": "npx nyc node test.js"
+  }
 }
diff --git a/scripts/tools/eslint-plugin-prettier-internal-rules/test.js b/scripts/tools/eslint-plugin-prettier-internal-rules/test.js
new file mode 100644
index 000000000..b0e6ddd04
--- /dev/null
+++ b/scripts/tools/eslint-plugin-prettier-internal-rules/test.js
@@ -0,0 +1,190 @@
+/* eslint-disable import/no-extraneous-dependencies */
+"use strict";
+
+const path = require("path");
+const { outdent } = require("outdent");
+const { RuleTester } = require("eslint");
+const { rules } = require(".");
+
+const test = (ruleId, tests) => {
+  new RuleTester({ parserOptions: { ecmaVersion: 2021 } }).run(
+    ruleId,
+    rules[ruleId],
+    tests
+  );
+};
+
+test("better-parent-property-check-in-needs-parens", {
+  valid: ["function needsParens() {return parent.test === node;}"],
+  invalid: [
+    {
+      code: 'return parent.type === "MemberExpression" && name === "object";',
+      errors: [{ message: "`name` comparison should be on left side." }],
+    },
+    {
+      code: "return parent.test === node;",
+      output: 'return name === "test";',
+      errors: [
+        { message: 'Prefer `name === "test"` over `parent.test === node`.' },
+      ],
+    },
+    {
+      code: "return parent.test !== node;",
+      output: 'return name !== "test";',
+      errors: [
+        { message: 'Prefer `name !== "test"` over `parent.test !== node`.' },
+      ],
+    },
+    {
+      code: 'return parent["property"] === node;',
+      output: 'return name === "property";',
+      errors: [
+        {
+          message:
+            'Prefer `name === "property"` over `parent."property" === node`.',
+        },
+      ],
+    },
+  ].map((testCase) => ({
+    ...testCase,
+    code: `function needsParens() {${testCase.code}}`,
+    output: `function needsParens() {${testCase.output || testCase.code}}`,
+    filename: "needs-parens.js",
+  })),
+});
+
+test("directly-loc-start-end", {
+  valid: [],
+  invalid: [
+    {
+      code: "options.locStart(node)",
+      output: "locStart(node)",
+      errors: [
+        { message: "Please import `locStart` function and use it directly." },
+      ],
+    },
+    {
+      code: "options.locEnd(node)",
+      output: "locEnd(node)",
+      errors: [
+        { message: "Please import `locEnd` function and use it directly." },
+      ],
+    },
+  ],
+});
+
+test("jsx-identifier-case", {
+  valid: [
+    {
+      code: "const isJSXNode = true",
+      options: ["isJSXNode"],
+    },
+  ],
+  invalid: [
+    {
+      code: "function isJSXNode(){}",
+      output: "function isJsxNode(){}",
+      errors: [{ message: "Please rename 'isJSXNode' to 'isJsxNode'." }],
+    },
+    {
+      code: "const isJSXNode = true",
+      output: "const isJsxNode = true",
+      errors: [{ message: "Please rename 'isJSXNode' to 'isJsxNode'." }],
+    },
+  ],
+});
+
+test("no-node-comments", {
+  valid: [
+    "const comments = node.notComments",
+    {
+      code: "function functionName() {return node.comments;}",
+      filename: path.join(__dirname, "../../..", "a.js"),
+      options: ["a.js"],
+    },
+    {
+      code: "function functionName() {return node.comments;}",
+      filename: path.join(__dirname, "../../..", "a.js"),
+      options: [{ file: "a.js", functions: ["functionName"] }],
+    },
+  ],
+  invalid: [
+    ...[
+      "function functionName() {return node.comments;}",
+      "const {comments} = node",
+      "const {comments: nodeComments} = node",
+    ].map((code) => ({
+      code,
+      output: code,
+      errors: [{ message: "Do not access node.comments." }],
+    })),
+    {
+      code: "function notFunctionName() {return node.comments;}",
+      output: "function notFunctionName() {return node.comments;}",
+      filename: path.join(__dirname, "../../..", "a.js"),
+      options: [{ file: "a.js", functions: ["functionName"] }],
+      errors: [{ message: "Do not access node.comments." }],
+    },
+  ],
+});
+
+test("prefer-fast-path-each", {
+  valid: ["const foo = path.map()"],
+  invalid: [
+    {
+      code: "path.map()",
+      output: "path.each()",
+      errors: 1,
+    },
+  ],
+});
+
+test("prefer-is-non-empty-array", {
+  valid: [
+    // `isNonEmptyArray` self is ignored
+    outdent`
+      function isNonEmptyArray(object){
+        return Array.isArray(object) && object.length;
+      }
+    `,
+    "a.b && a.c.length",
+    "a.b || !a.b.length",
+    '!a["b"] || !a.b.length',
+  ],
+  invalid: [
+    ...[
+      "a && a.b && a.b.length",
+      "a && a.b && a.b.length !== 0",
+      "a && a.b && a.b.length > 0",
+      "a && Array.isArray(a.b) && a.b.length",
+      "a && Array.isArray(a.b) && a.b.length !== 0",
+      "a && Array.isArray(a.b) && a.b.length > 0",
+    ].map((code) => ({
+      code,
+      output: "a && isNonEmptyArray(a.b)",
+      errors: 1,
+    })),
+    ...[
+      "!a || !a.b || !a.b.length",
+      "!a || !a.b || a.b.length === 0",
+      "!a || !Array.isArray(a.b) || !a.b.length",
+      "!a || !Array.isArray(a.b) || a.b.length === 0",
+    ].map((code) => ({
+      code,
+      output: "!a || !isNonEmptyArray(a.b)",
+      errors: 1,
+    })),
+  ],
+});
+
+test("require-json-extensions", {
+  valid: ['require("./not-exists")', 'require("./index")'],
+  invalid: [
+    {
+      code: 'require("./package")',
+      filename: __filename,
+      output: 'require("./package.json")',
+      errors: [{ message: 'Missing file extension ".json" for "./package".' }],
+    },
+  ],
+});