From 6b37df906cfe9bcc66a8e9d75586a1dc99956783 Mon Sep 17 00:00:00 2001
From: Christopher Willis-Ford <7019101+cwillisf@users.noreply.github.com>
Date: Wed, 30 Apr 2025 14:29:46 -0700
Subject: [PATCH] test: add tests for recommended rule set

---
 README.md                               |   35 +-
 eslint.config.mjs                       |   13 +-
 package-lock.json                       | 1277 ++++++++++++++++++++++-
 package.json                            |    8 +-
 test/__snapshots__/eslint.test.mjs.snap |  112 ++
 test/eslint.test.mjs                    |  110 ++
 test/recommended/eslint.config.mjs      |   14 +
 test/recommended/plain.bad.mjs          |   15 +
 test/recommended/plain.bad.ts           |   17 +
 test/recommended/plain.good.mjs         |   10 +
 test/recommended/plain.good.ts          |   10 +
 test/recommended/react.bad.jsx          |   14 +
 test/recommended/react.good.jsx         |   12 +
 test/recommended/tsconfig.json          |    6 +
 14 files changed, 1629 insertions(+), 24 deletions(-)
 create mode 100644 test/__snapshots__/eslint.test.mjs.snap
 create mode 100644 test/eslint.test.mjs
 create mode 100644 test/recommended/eslint.config.mjs
 create mode 100644 test/recommended/plain.bad.mjs
 create mode 100644 test/recommended/plain.bad.ts
 create mode 100644 test/recommended/plain.good.mjs
 create mode 100644 test/recommended/plain.good.ts
 create mode 100644 test/recommended/react.bad.jsx
 create mode 100644 test/recommended/react.good.jsx
 create mode 100644 test/recommended/tsconfig.json

diff --git a/README.md b/README.md
index 406e645..d89f229 100644
--- a/README.md
+++ b/README.md
@@ -12,28 +12,31 @@ Install the config along with its peer dependencies, `eslint` and `prettier`:
 npm install -D eslint-config-scratch eslint@^9 prettier@^3
 ```
 
-Add `eslint.config.mjs` to your project root and, optionally, configure parser options for rules that require type
-information:
+Add `eslint.config.mjs` to your project root.
+
+For a TypeScript project, you can add `languageOptions` to enable type checking:
 
 ```js
 // myProjectRoot/eslint.config.mjs
 import { eslintConfigScratch } from 'eslint-config-scratch'
 
-// for plain JavaScript:
-export default eslintConfigScratch.recommended
-
-// for a TypeScript project:
-export default eslintConfigScratch.config(
-  eslintConfigScratch.recommended,
-  {
-    languageOptions: {
-      parserOptions: {
-        projectService: true,
-        tsconfigRootDir: import.meta.dirname,
-      },
-    }
+export default eslintConfigScratch.config(eslintConfigScratch.recommended, {
+  languageOptions: {
+    parserOptions: {
+      projectService: true,
+      tsconfigRootDir: import.meta.dirname,
+    },
   },
-)
+})
+```
+
+For a JavaScript project, it might look like this:
+
+```js
+// myProjectRoot/eslint.config.mjs
+import { eslintConfigScratch } from 'eslint-config-scratch'
+
+export default eslintConfigScratch.recommended
 ```
 
 The function `eslintConfigScratch.config` is a re-export of the `config` function from `typescript-eslint`, and helps
diff --git a/eslint.config.mjs b/eslint.config.mjs
index eb90403..034c225 100644
--- a/eslint.config.mjs
+++ b/eslint.config.mjs
@@ -1,8 +1,13 @@
+import { globalIgnores } from 'eslint/config'
 import globals from 'globals'
 import { eslintConfigScratch } from './lib/index.mjs'
 
-export default eslintConfigScratch.config(eslintConfigScratch.recommended, {
-  languageOptions: {
-    globals: globals.node,
+export default eslintConfigScratch.config(
+  eslintConfigScratch.recommended,
+  {
+    languageOptions: {
+      globals: globals.node,
+    },
   },
-})
+  globalIgnores(['test/**/*.bad.*']),
+)
diff --git a/package-lock.json b/package-lock.json
index f6c78d8..57dcb03 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -34,7 +34,8 @@
         "eslint": "9.25.1",
         "husky": "8.0.3",
         "scratch-semantic-release-config": "3.0.0",
-        "semantic-release": "24.2.3"
+        "semantic-release": "24.2.3",
+        "vitest": "^3.1.1"
       },
       "peerDependencies": {
         "eslint": "^9.23.0"
@@ -598,6 +599,406 @@
         "node": ">=16"
       }
     },
+    "node_modules/@esbuild/aix-ppc64": {
+      "version": "0.25.3",
+      "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.25.3.tgz",
+      "integrity": "sha512-W8bFfPA8DowP8l//sxjJLSLkD8iEjMc7cBVyP+u4cEv9sM7mdUCkgsj+t0n/BWPFtv7WWCN5Yzj0N6FJNUUqBQ==",
+      "cpu": [
+        "ppc64"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "aix"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/android-arm": {
+      "version": "0.25.3",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.25.3.tgz",
+      "integrity": "sha512-PuwVXbnP87Tcff5I9ngV0lmiSu40xw1At6i3GsU77U7cjDDB4s0X2cyFuBiDa1SBk9DnvWwnGvVaGBqoFWPb7A==",
+      "cpu": [
+        "arm"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/android-arm64": {
+      "version": "0.25.3",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm64/-/android-arm64-0.25.3.tgz",
+      "integrity": "sha512-XelR6MzjlZuBM4f5z2IQHK6LkK34Cvv6Rj2EntER3lwCBFdg6h2lKbtRjpTTsdEjD/WSe1q8UyPBXP1x3i/wYQ==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/android-x64": {
+      "version": "0.25.3",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-x64/-/android-x64-0.25.3.tgz",
+      "integrity": "sha512-ogtTpYHT/g1GWS/zKM0cc/tIebFjm1F9Aw1boQ2Y0eUQ+J89d0jFY//s9ei9jVIlkYi8AfOjiixcLJSGNSOAdQ==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/darwin-arm64": {
+      "version": "0.25.3",
+      "resolved": "https://registry.npmjs.org/@esbuild/darwin-arm64/-/darwin-arm64-0.25.3.tgz",
+      "integrity": "sha512-eESK5yfPNTqpAmDfFWNsOhmIOaQA59tAcF/EfYvo5/QWQCzXn5iUSOnqt3ra3UdzBv073ykTtmeLJZGt3HhA+w==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/darwin-x64": {
+      "version": "0.25.3",
+      "resolved": "https://registry.npmjs.org/@esbuild/darwin-x64/-/darwin-x64-0.25.3.tgz",
+      "integrity": "sha512-Kd8glo7sIZtwOLcPbW0yLpKmBNWMANZhrC1r6K++uDR2zyzb6AeOYtI6udbtabmQpFaxJ8uduXMAo1gs5ozz8A==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/freebsd-arm64": {
+      "version": "0.25.3",
+      "resolved": "https://registry.npmjs.org/@esbuild/freebsd-arm64/-/freebsd-arm64-0.25.3.tgz",
+      "integrity": "sha512-EJiyS70BYybOBpJth3M0KLOus0n+RRMKTYzhYhFeMwp7e/RaajXvP+BWlmEXNk6uk+KAu46j/kaQzr6au+JcIw==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "freebsd"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/freebsd-x64": {
+      "version": "0.25.3",
+      "resolved": "https://registry.npmjs.org/@esbuild/freebsd-x64/-/freebsd-x64-0.25.3.tgz",
+      "integrity": "sha512-Q+wSjaLpGxYf7zC0kL0nDlhsfuFkoN+EXrx2KSB33RhinWzejOd6AvgmP5JbkgXKmjhmpfgKZq24pneodYqE8Q==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "freebsd"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/linux-arm": {
+      "version": "0.25.3",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-arm/-/linux-arm-0.25.3.tgz",
+      "integrity": "sha512-dUOVmAUzuHy2ZOKIHIKHCm58HKzFqd+puLaS424h6I85GlSDRZIA5ycBixb3mFgM0Jdh+ZOSB6KptX30DD8YOQ==",
+      "cpu": [
+        "arm"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/linux-arm64": {
+      "version": "0.25.3",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-arm64/-/linux-arm64-0.25.3.tgz",
+      "integrity": "sha512-xCUgnNYhRD5bb1C1nqrDV1PfkwgbswTTBRbAd8aH5PhYzikdf/ddtsYyMXFfGSsb/6t6QaPSzxtbfAZr9uox4A==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/linux-ia32": {
+      "version": "0.25.3",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-ia32/-/linux-ia32-0.25.3.tgz",
+      "integrity": "sha512-yplPOpczHOO4jTYKmuYuANI3WhvIPSVANGcNUeMlxH4twz/TeXuzEP41tGKNGWJjuMhotpGabeFYGAOU2ummBw==",
+      "cpu": [
+        "ia32"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/linux-loong64": {
+      "version": "0.25.3",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-loong64/-/linux-loong64-0.25.3.tgz",
+      "integrity": "sha512-P4BLP5/fjyihmXCELRGrLd793q/lBtKMQl8ARGpDxgzgIKJDRJ/u4r1A/HgpBpKpKZelGct2PGI4T+axcedf6g==",
+      "cpu": [
+        "loong64"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/linux-mips64el": {
+      "version": "0.25.3",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-mips64el/-/linux-mips64el-0.25.3.tgz",
+      "integrity": "sha512-eRAOV2ODpu6P5divMEMa26RRqb2yUoYsuQQOuFUexUoQndm4MdpXXDBbUoKIc0iPa4aCO7gIhtnYomkn2x+bag==",
+      "cpu": [
+        "mips64el"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/linux-ppc64": {
+      "version": "0.25.3",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-ppc64/-/linux-ppc64-0.25.3.tgz",
+      "integrity": "sha512-ZC4jV2p7VbzTlnl8nZKLcBkfzIf4Yad1SJM4ZMKYnJqZFD4rTI+pBG65u8ev4jk3/MPwY9DvGn50wi3uhdaghg==",
+      "cpu": [
+        "ppc64"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/linux-riscv64": {
+      "version": "0.25.3",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-riscv64/-/linux-riscv64-0.25.3.tgz",
+      "integrity": "sha512-LDDODcFzNtECTrUUbVCs6j9/bDVqy7DDRsuIXJg6so+mFksgwG7ZVnTruYi5V+z3eE5y+BJZw7VvUadkbfg7QA==",
+      "cpu": [
+        "riscv64"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/linux-s390x": {
+      "version": "0.25.3",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-s390x/-/linux-s390x-0.25.3.tgz",
+      "integrity": "sha512-s+w/NOY2k0yC2p9SLen+ymflgcpRkvwwa02fqmAwhBRI3SC12uiS10edHHXlVWwfAagYSY5UpmT/zISXPMW3tQ==",
+      "cpu": [
+        "s390x"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/linux-x64": {
+      "version": "0.25.3",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-x64/-/linux-x64-0.25.3.tgz",
+      "integrity": "sha512-nQHDz4pXjSDC6UfOE1Fw9Q8d6GCAd9KdvMZpfVGWSJztYCarRgSDfOVBY5xwhQXseiyxapkiSJi/5/ja8mRFFA==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/netbsd-arm64": {
+      "version": "0.25.3",
+      "resolved": "https://registry.npmjs.org/@esbuild/netbsd-arm64/-/netbsd-arm64-0.25.3.tgz",
+      "integrity": "sha512-1QaLtOWq0mzK6tzzp0jRN3eccmN3hezey7mhLnzC6oNlJoUJz4nym5ZD7mDnS/LZQgkrhEbEiTn515lPeLpgWA==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "netbsd"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/netbsd-x64": {
+      "version": "0.25.3",
+      "resolved": "https://registry.npmjs.org/@esbuild/netbsd-x64/-/netbsd-x64-0.25.3.tgz",
+      "integrity": "sha512-i5Hm68HXHdgv8wkrt+10Bc50zM0/eonPb/a/OFVfB6Qvpiirco5gBA5bz7S2SHuU+Y4LWn/zehzNX14Sp4r27g==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "netbsd"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/openbsd-arm64": {
+      "version": "0.25.3",
+      "resolved": "https://registry.npmjs.org/@esbuild/openbsd-arm64/-/openbsd-arm64-0.25.3.tgz",
+      "integrity": "sha512-zGAVApJEYTbOC6H/3QBr2mq3upG/LBEXr85/pTtKiv2IXcgKV0RT0QA/hSXZqSvLEpXeIxah7LczB4lkiYhTAQ==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "openbsd"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/openbsd-x64": {
+      "version": "0.25.3",
+      "resolved": "https://registry.npmjs.org/@esbuild/openbsd-x64/-/openbsd-x64-0.25.3.tgz",
+      "integrity": "sha512-fpqctI45NnCIDKBH5AXQBsD0NDPbEFczK98hk/aa6HJxbl+UtLkJV2+Bvy5hLSLk3LHmqt0NTkKNso1A9y1a4w==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "openbsd"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/sunos-x64": {
+      "version": "0.25.3",
+      "resolved": "https://registry.npmjs.org/@esbuild/sunos-x64/-/sunos-x64-0.25.3.tgz",
+      "integrity": "sha512-ROJhm7d8bk9dMCUZjkS8fgzsPAZEjtRJqCAmVgB0gMrvG7hfmPmz9k1rwO4jSiblFjYmNvbECL9uhaPzONMfgA==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "sunos"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/win32-arm64": {
+      "version": "0.25.3",
+      "resolved": "https://registry.npmjs.org/@esbuild/win32-arm64/-/win32-arm64-0.25.3.tgz",
+      "integrity": "sha512-YWcow8peiHpNBiIXHwaswPnAXLsLVygFwCB3A7Bh5jRkIBFWHGmNQ48AlX4xDvQNoMZlPYzjVOQDYEzWCqufMQ==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/win32-ia32": {
+      "version": "0.25.3",
+      "resolved": "https://registry.npmjs.org/@esbuild/win32-ia32/-/win32-ia32-0.25.3.tgz",
+      "integrity": "sha512-qspTZOIGoXVS4DpNqUYUs9UxVb04khS1Degaw/MnfMe7goQ3lTfQ13Vw4qY/Nj0979BGvMRpAYbs/BAxEvU8ew==",
+      "cpu": [
+        "ia32"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/win32-x64": {
+      "version": "0.25.3",
+      "resolved": "https://registry.npmjs.org/@esbuild/win32-x64/-/win32-x64-0.25.3.tgz",
+      "integrity": "sha512-ICgUR+kPimx0vvRzf+N/7L7tVSQeE3BYY+NhHRHXS1kBuPO7z2+7ea2HbhDyZdTephgvNvKrlDDKUexuCVBVvg==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/@eslint-community/eslint-plugin-eslint-comments": {
       "version": "4.5.0",
       "resolved": "https://registry.npmjs.org/@eslint-community/eslint-plugin-eslint-comments/-/eslint-plugin-eslint-comments-4.5.0.tgz",
@@ -1234,6 +1635,266 @@
         "node": ">=12"
       }
     },
+    "node_modules/@rollup/rollup-android-arm-eabi": {
+      "version": "4.40.1",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-android-arm-eabi/-/rollup-android-arm-eabi-4.40.1.tgz",
+      "integrity": "sha512-kxz0YeeCrRUHz3zyqvd7n+TVRlNyTifBsmnmNPtk3hQURUyG9eAB+usz6DAwagMusjx/zb3AjvDUvhFGDAexGw==",
+      "cpu": [
+        "arm"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "android"
+      ]
+    },
+    "node_modules/@rollup/rollup-android-arm64": {
+      "version": "4.40.1",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-android-arm64/-/rollup-android-arm64-4.40.1.tgz",
+      "integrity": "sha512-PPkxTOisoNC6TpnDKatjKkjRMsdaWIhyuMkA4UsBXT9WEZY4uHezBTjs6Vl4PbqQQeu6oION1w2voYZv9yquCw==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "android"
+      ]
+    },
+    "node_modules/@rollup/rollup-darwin-arm64": {
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+      },
+      "peerDependencies": {
+        "@edge-runtime/vm": "*",
+        "@types/debug": "^4.1.12",
+        "@types/node": "^18.0.0 || ^20.0.0 || >=22.0.0",
+        "@vitest/browser": "3.1.2",
+        "@vitest/ui": "3.1.2",
+        "happy-dom": "*",
+        "jsdom": "*"
+      },
+      "peerDependenciesMeta": {
+        "@edge-runtime/vm": {
+          "optional": true
+        },
+        "@types/debug": {
+          "optional": true
+        },
+        "@types/node": {
+          "optional": true
+        },
+        "@vitest/browser": {
+          "optional": true
+        },
+        "@vitest/ui": {
+          "optional": true
+        },
+        "happy-dom": {
+          "optional": true
+        },
+        "jsdom": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/webidl-conversions": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-3.0.1.tgz",
@@ -16392,6 +17651,22 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/why-is-node-running": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/why-is-node-running/-/why-is-node-running-2.3.0.tgz",
+      "integrity": "sha512-hUrmaWBdVDcxvYqnyh09zunKzROWjbZTiNy8dBEjkS7ehEDQibXJ7XvlmtbwuTclUiIyN+CyXQD4Vmko8fNm8w==",
+      "dev": true,
+      "dependencies": {
+        "siginfo": "^2.0.0",
+        "stackback": "0.0.2"
+      },
+      "bin": {
+        "why-is-node-running": "cli.js"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/word-wrap": {
       "version": "1.2.5",
       "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.5.tgz",
diff --git a/package.json b/package.json
index fb8d99e..3689a82 100644
--- a/package.json
+++ b/package.json
@@ -6,8 +6,9 @@
   "scripts": {
     "prepare": "husky install",
     "format": "prettier --write . && eslint --fix",
-    "lint": "eslint && prettier --check .",
-    "test": "npm run lint"
+    "test:lint": "eslint && prettier --check .",
+    "test:vitest": "vitest run",
+    "test": "npm run test:lint && npm run test:vitest"
   },
   "repository": {
     "type": "git",
@@ -54,7 +55,8 @@
     "eslint": "9.25.1",
     "husky": "8.0.3",
     "scratch-semantic-release-config": "3.0.0",
-    "semantic-release": "24.2.3"
+    "semantic-release": "24.2.3",
+    "vitest": "^3.1.1"
   },
   "config": {
     "commitizen": {
diff --git a/test/__snapshots__/eslint.test.mjs.snap b/test/__snapshots__/eslint.test.mjs.snap
new file mode 100644
index 0000000..fc535dd
--- /dev/null
+++ b/test/__snapshots__/eslint.test.mjs.snap
@@ -0,0 +1,112 @@
+// Vitest Snapshot v1, https://vitest.dev/guide/snapshot.html
+
+exports[`'recommended' > Plain TS (bad) 1`] = `
+[
+  {
+    "column": 7,
+    "endColumn": 25,
+    "endLine": 5,
+    "line": 5,
+    "messageId": "noInferrableType",
+    "nodeType": "VariableDeclarator",
+    "ruleId": "@typescript-eslint/no-inferrable-types",
+  },
+  {
+    "column": 7,
+    "endColumn": 12,
+    "endLine": 5,
+    "line": 5,
+    "messageId": "unusedVar",
+    "nodeType": null,
+    "ruleId": "@typescript-eslint/no-unused-vars",
+  },
+  {
+    "column": 10,
+    "endColumn": 13,
+    "endLine": 8,
+    "line": 8,
+    "messageId": "unusedVar",
+    "nodeType": null,
+    "ruleId": "@typescript-eslint/no-unused-vars",
+  },
+  {
+    "column": 14,
+    "endColumn": 26,
+    "endLine": 17,
+    "line": 17,
+    "messageId": "anyAssignment",
+    "nodeType": "VariableDeclarator",
+    "ruleId": "@typescript-eslint/no-unsafe-assignment",
+  },
+  {
+    "column": 20,
+    "endColumn": 24,
+    "endLine": 17,
+    "line": 17,
+    "messageId": "unsafeCall",
+    "nodeType": "Identifier",
+    "ruleId": "@typescript-eslint/no-unsafe-call",
+  },
+]
+`;
+
+exports[`'recommended' > Plain TS (good) 1`] = `[]`;
+
+exports[`'recommended' > React JSX (bad) 1`] = `
+[
+  {
+    "column": 10,
+    "endColumn": 13,
+    "endLine": 4,
+    "line": 4,
+    "messageId": "unusedVar",
+    "nodeType": "Identifier",
+    "ruleId": "no-unused-vars",
+  },
+  {
+    "column": 20,
+    "endColumn": 24,
+    "endLine": 14,
+    "line": 14,
+    "messageId": "undef",
+    "nodeType": "Identifier",
+    "ruleId": "no-undef",
+  },
+]
+`;
+
+exports[`'recommended' > React JSX (good) 1`] = `[]`;
+
+exports[`'recommended' > plain JS (bad) 1`] = `
+[
+  {
+    "column": 10,
+    "endColumn": 13,
+    "endLine": 4,
+    "line": 4,
+    "messageId": "unusedVar",
+    "nodeType": "Identifier",
+    "ruleId": "no-unused-vars",
+  },
+  {
+    "column": 26,
+    "endColumn": 46,
+    "endLine": 12,
+    "line": 12,
+    "messageId": "noJSXWithExtension",
+    "nodeType": "JSXElement",
+    "ruleId": "react/jsx-filename-extension",
+  },
+  {
+    "column": 20,
+    "endColumn": 24,
+    "endLine": 15,
+    "line": 15,
+    "messageId": "undef",
+    "nodeType": "Identifier",
+    "ruleId": "no-undef",
+  },
+]
+`;
+
+exports[`'recommended' > plain JS (good) 1`] = `[]`;
diff --git a/test/eslint.test.mjs b/test/eslint.test.mjs
new file mode 100644
index 0000000..e64720a
--- /dev/null
+++ b/test/eslint.test.mjs
@@ -0,0 +1,110 @@
+import { ESLint } from 'eslint'
+import path from 'path'
+import util from 'util'
+import { beforeAll, describe, expect, test } from 'vitest'
+
+/**
+ * @typedef {object} EslintTestInfo
+ * @property {string} name - the title/message for this test
+ * @property {string} filePath - the path to the file to lint
+ * @property {number} warningCount - the number of warnings to expect
+ * @property {number} errorCount - the number of errors to expect
+ */
+
+// TSX is omitted because TypeScript insists on fully knowing the React types,
+// and I would rather not add React as a dependency of eslint-config-scratch.
+/** @type {Record<string, EslintTestInfo[]>} */
+const testInfo = {
+  recommended: [
+    {
+      name: 'plain JS (good)',
+      filePath: 'plain.good.mjs',
+      warningCount: 0,
+      errorCount: 0,
+    },
+    {
+      name: 'React JSX (good)',
+      filePath: 'react.good.jsx',
+      warningCount: 0,
+      errorCount: 0,
+    },
+    {
+      name: 'plain JS (bad)',
+      filePath: 'plain.bad.mjs',
+      warningCount: 0,
+      errorCount: 3,
+    },
+    {
+      name: 'React JSX (bad)',
+      filePath: 'react.bad.jsx',
+      warningCount: 0,
+      errorCount: 2,
+    },
+    {
+      name: 'Plain TS (good)',
+      filePath: 'plain.good.ts',
+      warningCount: 0,
+      errorCount: 0,
+    },
+    {
+      name: 'Plain TS (bad)',
+      filePath: 'plain.bad.ts',
+      warningCount: 0,
+      errorCount: 5,
+    },
+  ],
+}
+
+/**
+ * Create a snapshot of a lint message.
+ * Excludes properties that may change without affecting correctness, such as human-readable text.
+ * @param {ESLint.LintMessage} result - the lint message to filter
+ * @returns {object} a filtered snapshot of the lint message
+ */
+const messageSnapshot = result =>
+  Object.fromEntries(
+    Object.entries(result).filter(([k]) =>
+      ['line', 'column', 'endLine', 'endColumn', 'messageId', 'nodeType', 'ruleId'].includes(k),
+    ),
+  )
+
+test('make sure eslint works at all', async () => {
+  const source = 'foo(42)'
+  const eslint = new ESLint({
+    overrideConfigFile: true,
+  })
+  const results = await eslint.lintText(source)
+  expect(results).toBeDefined()
+  expect(results.length).toBe(1)
+  expect(results[0].warningCount).toEqual(0)
+  expect(results[0].errorCount).toEqual(0)
+})
+
+describe.concurrent.for(Object.entries(testInfo))('$0', ([subdir, testList]) => {
+  /**
+   * @type {ESLint.LintResult[]}
+   */
+  let results
+
+  // Linting one file at a time takes much longer
+  beforeAll(async () => {
+    const eslint = new ESLint({
+      overrideConfigFile: path.resolve(import.meta.dirname, subdir, 'eslint.config.mjs'),
+    })
+    results = await eslint.lintFiles(testList.map(info => path.resolve(import.meta.dirname, subdir, info.filePath)))
+  })
+
+  test('results container', () => {
+    expect(results).toBeDefined()
+    expect(results.length).toBe(testList.length)
+  })
+
+  testList.forEach(({ name, filePath, warningCount, errorCount }, i) => {
+    test(name, () => {
+      expect(path.resolve(results[i].filePath)).toBe(path.resolve(import.meta.dirname, subdir, filePath))
+      expect(results[i].warningCount, util.inspect(results[i])).toBe(warningCount)
+      expect(results[i].errorCount, util.inspect(results[i])).toBe(errorCount)
+      expect(results[i].messages.map(messageSnapshot), util.inspect(results[i].messages)).toMatchSnapshot()
+    })
+  })
+})
diff --git a/test/recommended/eslint.config.mjs b/test/recommended/eslint.config.mjs
new file mode 100644
index 0000000..26648a5
--- /dev/null
+++ b/test/recommended/eslint.config.mjs
@@ -0,0 +1,14 @@
+import { eslintConfigScratch } from '../../lib/index.mjs'
+
+const config = eslintConfigScratch.config(eslintConfigScratch.recommended, {
+  files: ['**/*.ts', '**/*.tsx'],
+  languageOptions: {
+    parserOptions: {
+      projectService: true,
+      tsconfigRootDir: import.meta.dirname,
+      project: ['./tsconfig.json'],
+    },
+  },
+})
+
+export default config
diff --git a/test/recommended/plain.bad.mjs b/test/recommended/plain.bad.mjs
new file mode 100644
index 0000000..59f0e8e
--- /dev/null
+++ b/test/recommended/plain.bad.mjs
@@ -0,0 +1,15 @@
+import ESLint from 'eslint'
+
+// foo isn't used
+function foo() {
+  const eslint = new ESLint({
+    overrideConfigFile: true,
+  })
+  return eslint
+}
+
+// React isn't allowed in plain JS
+export const myElement = <div>{'hello'}</div>
+
+// foo2 isn't defined
+export const bar = foo2()
diff --git a/test/recommended/plain.bad.ts b/test/recommended/plain.bad.ts
new file mode 100644
index 0000000..232b642
--- /dev/null
+++ b/test/recommended/plain.bad.ts
@@ -0,0 +1,17 @@
+import { ESLint } from 'eslint'
+
+// @typescript-eslint/no-inferrable-types
+// @typescript-eslint/no-unused-vars
+const forty: number = 40
+
+// @typescript-eslint/no-unused-vars
+function foo(): ESLint {
+  const eslint = new ESLint({
+    overrideConfigFile: true,
+  })
+  return eslint
+}
+
+// @typescript-eslint/no-unsafe-call (`foo2` is an error-typed value)
+// @typescript-eslint/no-unsafe-assignment (`foo2()` is an error-typed value)
+export const bar = foo2()
diff --git a/test/recommended/plain.good.mjs b/test/recommended/plain.good.mjs
new file mode 100644
index 0000000..6996d5d
--- /dev/null
+++ b/test/recommended/plain.good.mjs
@@ -0,0 +1,10 @@
+import ESLint from 'eslint'
+
+function foo() {
+  const eslint = new ESLint({
+    overrideConfigFile: true,
+  })
+  return eslint
+}
+
+export const bar = foo()
diff --git a/test/recommended/plain.good.ts b/test/recommended/plain.good.ts
new file mode 100644
index 0000000..58ff8ca
--- /dev/null
+++ b/test/recommended/plain.good.ts
@@ -0,0 +1,10 @@
+import { ESLint } from 'eslint'
+
+function foo(): ESLint {
+  const eslint = new ESLint({
+    overrideConfigFile: true,
+  })
+  return eslint
+}
+
+export const bar = foo()
diff --git a/test/recommended/react.bad.jsx b/test/recommended/react.bad.jsx
new file mode 100644
index 0000000..8aecfdc
--- /dev/null
+++ b/test/recommended/react.bad.jsx
@@ -0,0 +1,14 @@
+import ESLint from 'eslint'
+
+// foo isn't used
+function foo() {
+  const eslint = new ESLint({
+    overrideConfigFile: true,
+  })
+  return eslint
+}
+
+export const myElement = <div>{'hello'}</div>
+
+// foo2 isn't defined
+export const bar = foo2()
diff --git a/test/recommended/react.good.jsx b/test/recommended/react.good.jsx
new file mode 100644
index 0000000..0a9cefb
--- /dev/null
+++ b/test/recommended/react.good.jsx
@@ -0,0 +1,12 @@
+import ESLint from 'eslint'
+
+function foo() {
+  const eslint = new ESLint({
+    overrideConfigFile: true,
+  })
+  return eslint
+}
+
+export const myElement = <div>{'hello'}</div>
+
+export const bar = foo()
diff --git a/test/recommended/tsconfig.json b/test/recommended/tsconfig.json
new file mode 100644
index 0000000..df7c461
--- /dev/null
+++ b/test/recommended/tsconfig.json
@@ -0,0 +1,6 @@
+{
+  "compilerOptions": {
+    "strict": true
+  },
+  "include": ["**/*.ts", "**/*.tsx"]
+}